GoodSoundClub - Romy the Cat's Audio Site

06-11-2014

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Romy the Cat

Boston, MA
Posts 10,052
Joined on 05-28-2004

Post #:	1326
Post ID:	20977
Reply to:	20962

Electro-magnetic fields

miab wrote:
Adrian, can you confirm whether you were using cable with shielding or without? Like you I had the buzzing go away when on battery or without PP2000 in system. It became dead silent. Then with PP2000 back in system there was buzzing. I went to all shielded cabling with PP2000 in system and it went silent again. I attributed it to ground loops not EMI.

Miab, I do think that you contradict yourself. If you were able to address the problems you had with shielding then it is not ground loop as shielding has nothing to do with ground look but only help to deal with stray electro-magnetic fields.

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche

06-11-2014

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Paul S
San Diego, California, USA
Posts 2,577
Joined on 10-12-2006

Post #:	1327
Post ID:	20978
Reply to:	20977

Shields and Grounding

Since there is no hard and fast "rule" about patterns for grounding electrical circuitry with respect to a circuit or circuits, per se, it can and does happen that chasses or parts of chasses/circuits are not grounded along with the "main" circuit, itself, in various components or groups of components, or a "loop" might be created by one or another grounding configuration. In any case, I can imagine a situation where adding grounded shields better grounds a chassis/circuit, as opposed to "merely" performing the singular task of shielding the line from stray EMI. Not to say this did happen in Miab's case; but it might have.

Paul S

06-11-2014

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Romy the Cat

Boston, MA
Posts 10,052
Joined on 05-28-2004

Post #:	1328
Post ID:	20979
Reply to:	20978

If, again if it is EMI...

... then I feel it needs to be addressed not shielded cables but by searching the source of it. if it is the case then I'm pretty sure that somewhere in battery charging circuitry there is some kind of pulse transformer or any other magnetic dispersing device that would be responsible for the problem. Those type of problems is much more important to address and source. I personally do not think that that would be the case as if the Canadian folks did forgot to put some kind of shield over battery charging circuitry or battery charging parts then they would react to the multiple complaints and would instantaneously knew what was wrong.

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche

06-11-2014

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steverino
Posts 353
Joined on 05-23-2009

Post #:	1330
Post ID:	20981
Reply to:	20967

Which version is having which problem

Again I would ask people who are reporting problems to state whether they have the original PP or the Plus version made in the last few years. One issue that is definitely tied to the Plus version was the overheating that a NZ customer reported. It was confirmed by PP since they directed the customer to mod their own unit. It is unclear how many similar units are out there and whether any design change on the Plus is completely effective in resolving that overheating or whether it has just been made less overt. I assume Adrian had an original version with a hum problem which was incautiously returned to the PP black hole. Or was Adrian's unit a Plus?

06-14-2014

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Romy the Cat

Boston, MA
Posts 10,052
Joined on 05-28-2004

Post #:	1331
Post ID:	20982
Reply to:	20981

PurePower versions

steverino wrote:
Again I would ask people who are reporting problems to state whether they have the original PP or the Plus version made in the last few years. One issue that is definitely tied to the Plus version was the overheating that a NZ customer reported. It was confirmed by PP since they directed the customer to mod their own unit. It is unclear how many similar units are out there and whether any design change on the Plus is completely effective in resolving that overheating or whether it has just been made less overt.

It is not so simple. Unfortunately there is so such a thing as PurePower versions. Where is original PP then PP enhanced(double power) and then PP+ there is countless versions between. You see, PP is any other small company as I understand makes the units by batches. They order parts for let say 20 units (I do not know what the real number would be), make them, sell them and they reinvest the portion of net into a new batch. There is nothing wrong with it, most of the mall HiFi shops operate this way. The PurePower is slightly different as they are learn as they go, constantly fixing the thing and adjusting the unit for presumably better and more stable performance. I do testify that among probably 14 PP units that were in my hand and probably 10-12 units that I observe in the playback of the people that I know the progress is very tangible – the newer units are better than old one.

However the picture is not so ideal. While PurePower is improving their unit they perfectly capable to screw up something in this unit and it look like they have no quality control to catch it. It had happened before and I know that there was a period of PP production when they made faulty operating and sounding units.

So, in context of it I think it makes sense do not talk about version of PurePower but rather about the batch or vintage. The problem is that no one knows what constitute PurePower Bach, lately I do have a feeling that they make one-two units per order…
Saying all of it I need to admit the I have old and new PurePower unit that operate a flawlessly. Go gigure….

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche

06-14-2014

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drdna
San Francisco, California
Posts 526
Joined on 10-29-2005

Post #:	1332
Post ID:	20983
Reply to:	20981

Pure Power Failures due to poor quality control

steverino wrote:
Again I would ask people who are reporting problems to state whether they have the original PP or the Plus version made in the last few years. I assume Adrian had an original version with a hum problem which was incautiously returned to the PP black hole. Or was Adrian's unit a Plus?

Yes, my original unit was an original PP2000. The replacement unit would be a Plus series, but they never sent it back to me.

Romy the Cat wrote:
Unfortunately there is so such a thing as PurePower versions.

While it is true that changes are constantly being made probably from unit to unit in production at APS, the major design change occurred with the adoption of Class D circuitry in the PP Plus series.
I suspect that the problems are caused by a mechanical/structural issue of the electrical circuit that is prone to failure in assembly or by damage in shipment. Maybe it would be best to just fly to their factory and pick one up in person.

Adrian

06-14-2014

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steverino
Posts 353
Joined on 05-23-2009

Post #:	1333
Post ID:	20984
Reply to:	20983

Wheels within wheels

Thanks Adrian and Romy for your replies. I can see a reason why PP is not servicing the original versions if there is such unit to unit variability. It would basically require discarding the original unit and sending out a PP plus in return in many cases. In my work some years ago I was tangentially involved in a somewhat similar circumstance with a large commercial electronic device. The difference was that changes were being made by customers (in cooperation with the vendor) to customize its operation. Thus the vendor did not know what it would find when it opened up a unit or at least each unit was sort of an individual case. Obviously maintenance was extremely costly. I remarked at the time that PP production was returned to Canada that I was very concerned about the establishment of a new manufacturing process coupled with untested design changes by a small company. I have never seen that work successfully.

06-14-2014

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drdna
San Francisco, California
Posts 526
Joined on 10-29-2005

Post #:	1334
Post ID:	20985
Reply to:	20984

Pure Power: will they ever honor their promise?

steverino wrote:
It would basically require discarding the original unit and sending out a PP plus in return in many cases.

Wow, you really know how to twist the knife. I only WISH they would make good on their promise to send me a new unit... I even paid them an extra $$$$ on top of everything. They don't even respond to my e-mails any more.

steverino wrote:
I remarked at the time that PP production was returned to Canada that I was very concerned about the establishment of a new manufacturing process coupled with untested design changes by a small company. I have never seen that work successfully.

It would be essential to at least track changes by designating a new version number, new part numbers, new schematics.

Adrian

06-14-2014

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Romy the Cat

Boston, MA
Posts 10,052
Joined on 05-28-2004

Post #:	1336
Post ID:	20987
Reply to:	20983

Silent like fish...

drdna wrote:

While it is true that changes are constantly being made probably from unit to unit in production at APS, the major design change occurred with the adoption of Class D circuitry in the PP Plus series.
I suspect that the problems are caused by a mechanical/structural issue of the electrical circuit that is prone to failure in assembly or by damage in shipment. Maybe it would be best to just fly to their factory and pick one up in person.

Actually I do not believe in any damage in shipment. Not for the problem people report. Also, there was no “Class D circuitry in the PP Plus series”. The Class D circuitry was used from beginning of time in those regenerators. Sine you say that the unit worked fine for you from battery and developed problem only when It was running from the wall them most likely that if any problem did exist in there then it was in battery charging circuitry – in my view the weakest point in the whole unit. I do not think that it was “failure in assembly”. Most likely it was that in PP+ units they moved to 96V batteries and they redesigned the charging circuitry and that “redesign” had some faults. Still, I have my badly “redesigned” PP+ and they are silent like fish. So, following the simplest explanation I do blame the end users.

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche

06-14-2014

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steverino
Posts 353
Joined on 05-23-2009

Post #:	1337
Post ID:	20988
Reply to:	20987

80/ 20 rule

I think any blanket statement that all the fault lies with PP or end users is going to be proved wrong. My Bayesian estimate based on prior experience outside of audio is that 80% is some fault of manufacture and 20% improper use or faulty troubleshooting by end users. In contrast with signal path components, end users are not likely modding or otherwise fiddling with an AC regenerator. The real issue is that there is no reliable repair center where statistics could be gathered on the various problems and their resolution. Romy at least can send his units back if a problem develops and PP will actually try to fix it or send him another. If my unit develops a problem that I can't resolve, it goes in the trash.

06-14-2014

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Romy the Cat

Boston, MA
Posts 10,052
Joined on 05-28-2004

Post #:	1338
Post ID:	20989
Reply to:	20988

What else is available?

steverino wrote:
The real issue is that there is no reliable repair center where statistics could be gathered on the various problems and their resolution. Romy at least can send his units back if a problem develops and PP will actually try to fix it or send him another. If my unit develops a problem that I can't resolve, it goes in the trash.

Well, the reality is a bit less straightforward then you think. I do not think that the units that I have are some kind of special PurePower regenerators that made to performer and the rest units are faulty. I absolutely confident that I have very much regular stock units, I did get faulty units as well and there was a time what I was sitting months with the PP unit and they keep promise me that it will be shipped “tomorrow”.

To the best of my knowledge the only customatization that even done to my units there was one signal level cable made shielded and the EMI spice insider of the unit offset the switching circuitry. I discovered it after 2 weeks experimenting with PP, so PP folks fixed it and I think they do it on each unit since then.

I do not think that I can easily fix PP it or get replacement. PurePower is not the company with many ready to be sipped unit laying around and I am not the person who would let the properly sounding PP to live my house – who know what would be replacements. So, I am very much pray that PP do not blow and if it does then I will be in the very same Q with anyone else.

There is however, something about me that distinct me from at least the folks who post at this site. I do very much believe in PP sound. The PP company, this marketing and service practice – this is all a completely separate subject and they shall be shamed. However, the sound of the properly operating PP to me set all bets off. I can bitch about PP and express what I like and do not like but instead I chose to be supporter of PP because I very much respect and appreciate the result the PP units can deliver. I have zero loyalty to the company and PP people know it but I do have understanding that today PP is a monopoly and besides PP not one makes class D generators that approved sound. I spend year dealing with PP and I know what Sound they produces. For sure it might be 54,000 other class D generators that sound even better – will you waste months/years and much money of your life for testing them? If someone would I would be happy to know that I do not need to play that PP are operational but until I have an alternative I just have no other options. One need to spend years of playing with power devises, discover the PP sound and then to learn appreciate what he has instend of fantasize about what is not available.

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche

06-14-2014

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steverino
Posts 353
Joined on 05-23-2009

Post #:	1339
Post ID:	20990
Reply to:	20989

Reading something not written

At no time have I ever stated that you got a gold plated unit. I trust your statements 100% unlike many others. My only point is that PP for marketing reasons would at least make a real attempt to fix a unit you sent back. If I had a problem not resolvable locally, I would just throw out the PP because it would never get fixed and I would be out the shipping cost. The only alternative is to buy a used unit if one becomes available. I understand your point about the lack of ready alternatives at this moment although I am hopeful that someone else will come along soon since the basic double conversion process is widely available. If it weren't for the fans unneeded for home use in the available units, I could have tried 3 or 4 units for a total under $2k.

07-20-2014

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drdna
San Francisco, California
Posts 526
Joined on 10-29-2005

Post #:	1340
Post ID:	21108
Reply to:	20990

Pure Power 3000+ has arrived!

Now fully five years after the original PP2000 was in my system, then subsequently stopped working and was sent back for repairs to the manufacturer. An unfortunate series of events involving the Chinese subcontractor resulted in the company contracting severely, and my original unit was lost. Numerous excuses were made, but eventually the APS company made it back on their feet.

Almost beyond belief after such a long time, and thanks to those here who encouraged APS to "do the right thing" and send me a replacement unit; finally it has arrived! I waited to report on this until the unit was actually physically in my possession...

But now it is here. APS sent me a PP3000 Plus unit including the Power Pack and Furutech FPX-R receptacles. After plugging it in and letting it settle for a few days, I have been listening to it this weekend. The sound is as I remember it. It is frankly impossible to make a direct comparison to the PP2000 as it has been such a long time, but all my original remarks apply. The only thing missing is the buzzing hum which plagued my first unit. This unit is absolutely silent in operation, leading perhaps credence to my original suspicion that the original buzzing was due to a manufacturing defect.

Now it is totally silent and the Sound is coming through gloriously again. More commentary to come in a while...

Worth the wait.

Adrian

07-21-2014

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Romy the Cat

Boston, MA
Posts 10,052
Joined on 05-28-2004

Post #:	1341
Post ID:	21110
Reply to:	21108

Yes, well worth it in my view

drdna wrote:
Now fully five years after the original PP2000 was in my system, then subsequently stopped working and was sent back for repairs to the manufacturer. An unfortunate series of events involving the Chinese subcontractor resulted in the company contracting severely, and my original unit was lost. Numerous excuses were made, but eventually the APS company made it back on their feet.

Almost beyond belief after such a long time, and thanks to those here who encouraged APS to "do the right thing" and send me a replacement unit; finally it has arrived! I waited to report on this until the unit was actually physically in my possession...

But now it is here. APS sent me a PP3000 Plus unit including the Power Pack and Furutech FPX-R receptacles. After plugging it in and letting it settle for a few days, I have been listening to it this weekend. The sound is as I remember it. It is frankly impossible to make a direct comparison to the PP2000 as it has been such a long time, but all my original remarks apply. The only thing missing is the buzzing hum which plagued my first unit. This unit is absolutely silent in operation, leading perhaps credence to my original suspicion that the original buzzing was due to a manufacturing defect.

Now it is totally silent and the Sound is coming through gloriously again. More commentary to come in a while...

Worth the wait.

Hm, might it be that 2014 is the year? A few years after 1999 I still was waiting that anytime my completely pre-paid new Micro arrived from Japan, perhaps 2014 is the year when al, the thing come together?

Anyhow, I can't say anything besides Bravo PurePower. I have no idea why they delayed it and I have no idea why they sent it, however I would like to point out that as a result you got much more advanced, sophisticated ( and more expensive) regenerator then you original PP2000 was. I gig heard from unwelcomed correspondences that PP did some further changes since I got my unit, so only Got know how of my and your unit deliver the same sound. Let presume that it is and if so then you shall be very lucky. My works flawlessly sine insertion and sound great. Find the phase on which it sound better, even if you have a dedicated line. In US we have two sides of 220V, each of them 120V. They are not truly two phase but rather side A and B of the same 120V line and they do sound distinctly different. Also, be advised that presence of the other switching devises in your let say side A do adversely impact of the sound of your new PP3000.

In the end I would like to note that as I always said those "numerous excuses" and reasonable delays are normal "modus operandi" from Pure Power if they have something not fluent on their side. As I told some people get turned off by it, I have some of my good friends do not want to hear about. I can't not blame them and I do feel what they feel. However, if to pass on that notion that somebody shall comply with your expectation and humiliate own consumer ego then there is a chance that you get a well working PP3000 as a result. You said that it "Worth the wait", I have been feeling the very same since 2006-2007, since I hear the very first PP1050 unit and said: there is something very worthy in it. That pursuit to get this " very worthy" did drive me across all tribulation with PP, which I still do feel is a spectacular product, even conspiring the "strangeness" of the company.

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche

08-21-2014

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Romy the Cat

Boston, MA
Posts 10,052
Joined on 05-28-2004

Post #:	1342
Post ID:	21174
Reply to:	2931

PP3000+ and ... the alien switching forces.

I have written in past that for some mystery reasons my PP3000+, and I presume all other PP3000+, do adversely affected by switching power supplies in the feeding line. I have PP3000+ and older PP3000 and both of them works wonderfully, one on main listening room and another in opera room. However, if they work at the SAME time then they do compromise each other and sound become very auditably brighter. That is what I am saying for a while but recently I discover something more.

The presence of any switching PS on the same line where my PP3000+ sits does contribute negatively to sound. That is despite that my PP3000+ connected to a dedicated line, the switching PS on the same half of 220V still reaches PP somehow. The degree is much less but auditable. For instance I use powerful portable workstation Lenovo laptops, the W series , and they have big 160W power supplies. I usually do not that I plug them and did not file then they affect sound. However, a few days back I was listening my Wagenseil's quartets for low strings and suddenly felt that sound is unreasonably muddy and bright at the same time. In those quartets viola plays upper octave lead but it had no typical for viola dark sound but rather it was too cheerful. I was walking around the playback, scratching my back and was not able to figure out what was going on. Then I felt that sound become softer and viola got darker. What was going on I was wondering...

I sat to my chair, took my laptop to write some email and then it hit me: the laptop's PS was very hot. The point is that I left the laptop on the deck a day before and the big 9-cell battery was almost completely discharged. As I plug the laptop to PS the charger detected the ultra low impedance of discharged butter and begin rush a lot of current across PS, presumably injecting a lot of switching supply noise to the mains. Well I tested the theory. I have discharged another battery and did again the experiment. Sure, it was clearly auditable from 5% of battery change to approximately 15-20% and after which I did not think I felt any difference.

I have absolutely no explanation of the phenomena as PP3000+ flats the things to DC not to mention it dissecting main by 20kHz of own switching sampling rate. Anyhow, watch any switching PS in the line where your PP install. The effect might be minor but it is there.

Rgs,
Romy teh Cat

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche

08-21-2014

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steverino
Posts 353
Joined on 05-23-2009

Post #:	1343
Post ID:	21175
Reply to:	21174

AC / DC but not the band

I have not found the PPs to completely isolate under many situations although they even out sonics across the day fairly well. The PP is far more steady when hooked into my small tubed bedroom system than the main system, the small TV HT system or the computer based headphone system. . There are fluctuations in sonics in the main and HT systems even though the PP is running well under its rated capacity. (The TV is not even on the PP.) Typically the problem lasts for an hour or two before dissipating. Trying to chain a similar device such as a turntable controller produces worse sound in both compared to separating them.

08-21-2014

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Lx_
France
Posts 33
Joined on 12-06-2009

Post #:	1344
Post ID:	21176
Reply to:	21174

Not surprised

Hello Romy,

I am not surprised by your report, since I have experienced this with my PP2000. I must have shared this here already but here goes some of it. I can hear many things behind the PP, the amount depending on the equipment. Switching PSs are indeed quite noisy. I can remember being horrified when I discovered how much garbage a Dell PS was injecting into the mains and through the PP. At the time I think you were incriminating a faulty PP unit and/or installation. Maybe the issue is greater for non-US units, one of which I have (EU). But since you now acknowledge the issue at your place, this factor may be ruled out (though by how much I do not know). We must also take into account that you have a newer unit, and only PP people know what impact this has regarding sensitivity to AC mains (or at least we wish they do).

Anyway I have been disconnecting as many devices as is convenient (though not including a switching PS, the fridge is quite noisy too but I prefer getting some noise than salmonella or other nice bacteria) for several years. In the end, the best solution would be to unplug the PP from mains altogether (thereby getting rid of its internal charging circuit that does its own radiating), though I would need to hook several additional batteries to be able to enjoy a few hours of continuous (ecstatic) listening.

Lx_

08-22-2014

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Romy the Cat

Boston, MA
Posts 10,052
Joined on 05-28-2004

Post #:	1345
Post ID:	21177
Reply to:	21176

That all about the residual difference.

Lx_, it is so and not. I never made a secret that PP has some sensitivity to line before it but for the people who do not use it the degree of the comment would not be possible to understand. Even for PP the relative degree of the comments like my comment above would be not always clear.
A PP unit, if it works properly, for sure does superbly positive impact to sound but there is a twist in this statement, I have written about it in past.

You see, we plug PP that presumably "cleans" electricity and we feel that the improvement that we get come because the electricity was made better, It very much might be so but it also possible that improving of electricity was only a contributive factor. PP might precondition PS of electronics with own "switching power" that make electronics to sound better regardless of quality of electricity. For sure it does impacts the quality electricity but I have hard time to say what percentage of PP beauty is responsible for it.

I think what would be very interesting to experiment is to feed PP with some kind of other power devise. I did experimented with 3-5kW isolation transformers and it was not good - the all kill lower octave - ironically the fact of killing LF did go over the PP. I was trying the capacitor-base noise suppresser before PP and it also did not work well - Sound become to remind me a wet dog. I did not try some of those super expensive caps that reportedly could work on AC without damaging sound but I am not ready to pay $5K juts for an experiment.

I think as people use PP the concept of "open source" would pay off soon or later somebody find some kind of PP preconditioned that would even further stabilize the power lines. For sure PP is a "giant leap of mankind" into the word of power treatment of playback but now we the PP users need to learn how to ride the lunar rower on the moon's dust...

BTW, I very much disagree with you about your ideas of several additional batteries and running PP away from mains. That is conceptually a white flag not to mention the low practicality of the ideas. If you insist to use batteries then you do not need any PP, the step down transformers in your electronics, the rectification, filtration and many other things. Run you army of batteries directly to your operating voltages and you would be all set. Again, I do not think that people who are in that camp should even consider to use AC treatment devises like PP.

The Cat

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche

08-22-2014

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Lx_
France
Posts 33
Joined on 12-06-2009

Post #:	1346
Post ID:	21178
Reply to:	21177

Quite satisfied as it is now

You are correct that running everything off DC would be a much better solution. Alas, this is not what is largely available and we have to use AC as input to our components, unless one is willing to heavily (if not with difficulty) modify each and every device in the system (or go the route of having them custom made). Also, DC mains is not as well-chartered territory and I am sure it would bring its own issues. Anyway for me this is more than what I am willing to concede. OTOH since I already have a PP, running it off batteries seems far from insurmountable, and the recollection I have of battery mode is very attractive. But as you say this is all about relativity (even though I did not mention it since I was addressing you directly, I strongly agree that the differences we are talking about are details compared to the improvement you get when switching over to PP -- but we are here to go beyond this evidence and discuss those nuances), and until now I have made do without it.

09-11-2014

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steverino
Posts 353
Joined on 05-23-2009

Post #:	1347
Post ID:	21212
Reply to:	21178

Power Inspired ac regenerators

Are any of the Euro or Australian Forum members familiar with the Power Inspired AC Regenerators. Formerly they only had a small 500 W double conversion unit but now they added a 1500W unit. They seem to be targeting it for audio installations at least in part as they emphasize low noise. Below is a description of one of their Australian configured units:

Power Inspired's AG1500 AC ReGenerator is a true online double conversion system providing the highest degrees of power protection, with a stable unwavering high quality power waveform for sensitive and critical loads.

Unlike other online units the AG1500 is extremely quiet making it suitable for where high quality power is required but without the noise, and unlike other systems the bypass is disabled by default ensuring that raw mains power never reaches your equipment, only clean pure power at all times.

The AG1500 has a manual variable speed fan which allows the user to turn the fan speed to minimum when the unit will be used for only momentary bursts of power so as to minimise any audible distractions.

For UPS support, battery pack B2U-96-9 can be added, although not required for AC ReGeneration and power conditioning.

This item is fitted with a AUSTRALIAN 15A Socket Outlet

09-12-2014

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Romy the Cat

Boston, MA
Posts 10,052
Joined on 05-28-2004

Post #:	1348
Post ID:	21213
Reply to:	21212

No bypass as a virtue? Sounds stupid to me.

steverino wrote:
Unlike other online units the AG1500 is extremely quiet making it suitable for where high quality power is required but without the noise, and unlike other systems the bypass is disabled by default ensuring that raw mains power never reaches your equipment, only clean pure power at all times.

Ok, this is Australian version of PP, a commercial double-conversion UPS that they accommodated for audio use. Looks good, I wish they put some audio credentials in there to show off that they are capable to deal with audio objectives.

One comment that I would like to make: the fact that they disabled bypass is not a huge accomplishment but rather a stupidity in my view. 1.5kW is very low power and it is very frequently a playback would suck more in peak. So with bypass not being in picture what the unit does then? 1500W is 6.8A at 220V. Any powerful SS amp, or start up saturation of chokes of a tube SET will blow 6.8A with easy. So, what do they do then? Fire a fuse or flow the output transistors? OK. According to them to feed the load with a few periods of high infiltrated high current is bad but to turn unit off what it demands more current is good? Well, to me it is not smart and juts an indication that they do not have, perhaps yet, any practical experience with real world of playback systems.

Rgs, Romy

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche

09-13-2014

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steverino
Posts 353
Joined on 05-23-2009

Post #:	1350
Post ID:	21215
Reply to:	21214

Thanks for the info

Power Inspired seemed to be somewhat new to the audio field although it's quite possible that they were making related products for industrial customers. In my own market survey some months ago I found 4 credible US manufacturers of double conversion UPS devices. The one problem common to all was the noise level of the operating fan. I guess they are typically stuck in electrical closets or other hot rooms with high levels of ambient noise so no one is bothered by it. People trying to use them at home or in typical offices were the ones who complained of the noise. Power Inspired seems to have solved that issue I gather from Decoud's experience. They had a low power 500W model a while ago but seemed to have added the 1500W model more recently. I don't know when Decoud got his of course. They do not have a US compatible model although I guess they could modify it. While Romy might find 1500W puny, I think most would find it more than powerful enough. I know I barely get to 25% on the 1050 even on the main system.

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