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10-09-2008 Post does not mapped to Knowledge Tree
serenechaos
lost alamos
Posts 86
Joined on 12-01-2007

Post #: 51
Post ID: 8476
Reply to: 8475
Almost 4" driver

How about the 4" Fostex FE108E? http://www.madisound.com/catalog/index.php?manufacturers_id=131&sort=3a&page=1 

It's only too big by 0.080", and if that bothers you, it would be easy to chuck by the magnet, & turn that off the diameter of front basket.  
Even on a slight bevel with a radius to look nice, then black it again and it wouldn't even show. 

It would be in the same family of sound as FE108ES II which I find to be great between 300 - 8000 Hz.  
You might be able to hear them somewhere?
Robert

10-09-2008 Post does not mapped to Knowledge Tree
el`Ol
Posts 225
Joined on 10-13-2007

Post #: 52
Post ID: 8477
Reply to: 8476
Görlich is back

There is an announcement in the new Hobby Hifi:

Expolinear is going to distribute Görlich drivers. Old price, half of the current elite Car audio stuff, and probably 8 Ohm. 13 and 17 cm will be available with rubber, foam and cloth surround, 20 and 25 cm only with rubber surround.

10-11-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,184
Joined on 05-28-2004

Post #: 53
Post ID: 8484
Reply to: 8469
Some updates with MiniMe

I am quite fascinated with the result that I might get from MiniME and at the same time I am defensive with the direction it takes. Anyhow, here is how it stands…

The decision to go for MF driver was I think right one. Even the 70-20RX tweeter has some “tools” that enable it to work more of less confidently in MF but I never exited about tonal capacity of ribbons. Also, I would like to make MiniME to be able to play loud and with less compression and therefore I would need some headroom between the lower knee of drivers and their crossover point. So, the 3-way with a good band-pass MF driver is a reasonable, I guess, direction to look, even though I might use MF not as independent channel but rather as pedalpoint for tweeter to woofer WITH the woofers, not to fulfill the gap evenly between LF and HF but rather to help to the ribbon and bass driver to care MF.

A guy who read my site sent me to try the JBL-5-2. I always liked those drivers however; I knew LE-8 and never tried the JBL-5. Playing with JBL-5-2 I figure out that it might be exactly what I need. It has 95dB sensitively. It has the right tonal nobility and it is small. The driver is slightly less dynamic then LE-8 when crosses at the same frequency of 1000Hz. I made a number of experiments with it and end up listening the JBL-5-2 with 25uf cap. That makes approximately 800Hz crossover point. It is possible to drive LE5 lower but then at higher volumes the driver gets compression sooner. Ironically the HF section of the driver is falling apart faster with higher volume. So, I was roiling it off and off and end up with and 0.31mH coil, that makes approximately 4000 crossover point. In fact rolling it even lower sounds more right to me, probably down to 1-2K. All together JBL LE5-2 in 800Hz-4000Hz region the LE5-2 do OK, not perfect but OK. I bought the JBL 2105 – the pro version – I might sound different – who knows…

http://www.audioheritage.org/vbulletin/showthread.php?t=5706

There are 3 things that attract me in JBL LE5-2 driver – the sensitivity, some tonal qualities (not overly thrilling but better then others) and the absence of the thing that annoy me. I mean the JBL LE5-2 is quite neutral driver in term of character, partiality and bias – this is important for me as I would like do not deal with it in this loudspeaker. It is possible that there are more capable 4-5” MF drivers then LE5/2105. I spoke with a number of people who proposed to me different solutions. For instance the sound like knowledgeable guy from Planet 10

http://www.planet10-hifi.com/

…proposed a number of Fostex solutions.  I do not know - I have seen so much negative result from Fostex side (perhaps improperly implanted) that it makes me prejudicial… From what I have seen the Fostex always loose correlation with sounds when volume goes up. The Fostex-like drivers might work in sever high-pass through, but the 6dB-7dB sensitively is not nothing.  I wonder what would be the new Görlich sensitive, the old one were at 87dB…

So, I have the tweeter, I have the MF driver, I will have my Malaysian woofers. The LE5 is 95dB sensitive the Malaysian woofers are 90.5dB at 1000Hz. The 4 of the woofers would do +6dB that would be just slightly above LE5-2. In addition it will be in array that would make it integrateable at 1-2 db higher. The RAAL 70-20RX is 93-94dB but 96-97dB effectively. That would make the target sensitively of the entire speaker somewhere around 96dB, here and there…

What however, bother me in this idea is that introduction of MF screw up my entire idea of the MiniMe’s simplicity. The 5” thin and straightforward tower with a few brasses is becoming just a dream. The MF driver shell sit at more or less ears level, the tweeter might be above. However, the MF driver needs to be isolated from the pressure of LF drivers, I was trying to use a back change on JBL and I did not like it. So, the speaker shell have sections and waste some volume of the effective speaker height - I do not want to make it too tall.  So, the complexity of the enclosure increases and at this point I do not think that my regular machinist would be able to do it at cost-effective fashion. I am not going to do any enclosure work myself, so it might need lead to bringing some speaker-building specialist to help. Thos guys use wood and wood would bring thickness – bye-bye the 5” front baffle… perhaps I need to make it with ¼ steal sheets and forget about it? I do not know at this point. It is become more complex then I would like it to be… Does anyone who read this know any machinist from New England who would LIKE to build loudspeakers (send me emial if you do).  I am afraid that my machinist when I drown for him all those steal or G10 labyrinths and sections would sent me to hell.

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
10-11-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,184
Joined on 05-28-2004

Post #: 54
Post ID: 8486
Reply to: 8484
The MiniMe as a Double-Decker?

Actually it is very possible that it might be so. I made some rudimental measurements and concluded that RAAL tweeter and JBL midrange mounted in the same baffle has non-perfect time aliment. So, I will need to use gaskets under the drivers to time-align them and it is all keeping the speaker sealed.  Hmmmm, too mach hustle…

Then I thought: the tweeter is sealed and does not care about the box. The MF driver crossed at 700-800Hz does not really care about box as with a small even not-sealed enclosure it already acts as an infinite baffle. So, what not to put the MF and HF drivers in a separate “Island” that would be sitting atop of the main LF section, similar to what Parsifal or small Wilson do? The upper frequency “Island” might be small, with no demands to resonance control, and might use a very thin material, like 1/8 of G10 or the similar. I might not even close the back side of the thing… This would make the entire box design very simple and would enable an easy access to the drivers for time alignment.

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
10-12-2008 Post does not mapped to Knowledge Tree
Lbjefferies7
Southern California
Posts 49
Joined on 01-11-2008

Post #: 55
Post ID: 8487
Reply to: 8486
MiniMe 3-Way

MiniMe is growing up...

It is a shame that you will not be able to utilize the ringy dustcap that the origional drivers have, but the JBL LE5-2 driver is quite nice and should not bring many surprises.

I found something today that you might find useful for the adjustable port tuning...
http://www.carlonsales.com/productdrawings/E945G.pdf
http://www.carlon.com/Installation_Training/IT-NEMAEXJTA.pdf

They are available at Home Depot or a good electrical supplier.  They should do exactly what you need if they will go short enough.

LBJ


I'm not interested in having an orchestra sound like itself. I want it to sound like the composer. Leonard Bernstein
10-12-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,184
Joined on 05-28-2004

Post #: 56
Post ID: 8489
Reply to: 8487
There is very little defined as now…

Yep, thanks.

I still do not know why you feel that I will not exploit the “ringy dustcaps” on the Malaysian bass drivers; in fact I never gave up on this idea. I preliminary concluded that my MF channel might not go lower then 700Hz but I did not say what will be the upper limit of my woofers. At this point I have no idea now my MF will behave in infinitely baffle incisures, how the channel will be jointed, if the JBL drivers and the Malaysian driver will be able to play together and if they do then how will they overlap. IF the Malaysian array at their upper knee will be able to embraces the TTH characteristic of LE-5, and wise versa….

http://www.goodsoundclub.com/Forums/ShowPost.aspx?postID=5874

… then only God know where I will be able to cross them. The common rules suggest that with first order the overlap between the drivers too large anyhow (lobbing and other issuers…). It is right in theory but in practice it is all baloney and I discard it. If the right drivers are very much time-aliened then it is fine for them to play together and to cover the same range. My thought about it was the reason why in my last drawing I made the “MF Island” not with semi-diamond shape (better for imaging) but rectangular. It was gone because it allows me to flip the “Island” unsaid down, extending inclusion of the MF driver into the Malaysian’s array…

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
10-14-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,184
Joined on 05-28-2004

Post #: 57
Post ID: 8508
Reply to: 8486
Playing with RAAL 70-20RX
fiogf49gjkf0d

In inversing tweeter, spent some time listing it. It has at 93dB 6.8R and .63mH. The inductance  is too high for my application, so I would need to shunt primary with one more coil to drive inductance   down. I recognize only Bessel curve and it would be:

4kHz – 3.6uF -.43mH
5kHz – 2.9uF -.35mH
6kHz – 2.4uF -.29mH
7kHz – 2.1uF -.25mH

I was driving it up and down and as I expected the higher I cross it the better result was. It is not sound to my likening below 3K but at 6K-7K it is very nice. I think it is where I might end up using it. I did not drive the 70-20RX along with JBL LE5-2 yet – I need some kind of frame to mount them. I do not think that I will be doing it at this point… It looks like it might turn out to be an interesting upper frequency section.  Let hope that LE5 would have enough “colors” to shine through the RAAL’s neutrality. Well, from another side – the LE5 are cheap and I might experiment to soak in cone with kind of chitin or floor polishing… I can see it coming and I sell next CES the drivers that were pre-treated by boiling in collected sputter of adolescent camel.

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
10-23-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,184
Joined on 05-28-2004

Post #: 58
Post ID: 8615
Reply to: 8486
The MiniMe’s Naturmort
fiogf49gjkf0d
OK, I have desired to build the thing. It is not the I really need it but I would need some kind MiniMe monitor and I really would like to see how bad it will turn out to sound the speaker that I invasion with this drivers of mine. After much vague circulations and abstract approximations the final design was made. The final internal dimension of bass section will be 37” by 9.5” by 5” that make 1.017 cub feet. I still have no decision if to use one or two ports but most likely it will be 2 double flared ports. With thin configuration I think I will be able to get, without pushing, approximately 40Hz, how then will sound I have no idea. The dimensions of the Island are 9.75” by 4.75” and by 5”, I might keep it sealed or not - it is irrelevant. The material will be ½ of G10 or engineered bamboo (still debating) with 3 brasses per speaker. I have all drivers and pretty much no impediment at this point to render this project. It is nice to involve in something tangibly-creative when world economy going down to drain…

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
10-24-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,184
Joined on 05-28-2004

Post #: 59
Post ID: 8622
Reply to: 8138
The Scan-Speak Illuminator.
fiogf49gjkf0d

I came across to a new to me very interesting driver: Scan- Speak Illuminator.

http://www.tymphany.com/15wu_8741t00

it looks like it is new for them as well and it might be very interesting. It is around 84dB, to get any more or less reasonable sensitivity it is necessary to have 6 of them. They are at $230 each- pricy for 12 drivers.  Still it might be interesting. I am not planning to use of for MiniMe – it already way beyond what I need but the opportunity that the Illuminator offers are inspiring.  I am concerned that they do not provide the length of gap and max exertion- the under-hung motor is good  but how far? Anyhow, the Scan- Speak knows what they do and it might be very interesting driver for a MiniMe-like projects. Now, when they will do the 2.5” exertion in full under-hung mode only 18-inchers?

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
10-25-2008 Post does not mapped to Knowledge Tree
Lbjefferies7
Southern California
Posts 49
Joined on 01-11-2008

Post #: 60
Post ID: 8624
Reply to: 8622
Interesting MiniMe-type Drivers
fiogf49gjkf0d

It may be good, though i've worried about SS since Tymphany took over.  I have seen many good companies with good products completely screwed by new management.  Their re-packageing of Peerless into V-Line (or whatever the hell that was) speaks of marketing moronism especially.  The motors they are using on the Illuminators look quite good...neodymium magnets will probably become more and more popular in these type products and perhaps justifiably so.

I found these a few days ago...https://www.solen.ca/pdf/atd/14w2608agti.pdf

Any experience or speculation about these drivers?

LBJ


I'm not interested in having an orchestra sound like itself. I want it to sound like the composer. Leonard Bernstein
10-25-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,184
Joined on 05-28-2004

Post #: 61
Post ID: 8628
Reply to: 8624
Yes, I know those drivers
fiogf49gjkf0d

 Lbjefferies7 wrote:
I found these a few days ago...https://www.solen.ca/pdf/atd/14w2608agti.pdfAny experience or speculation about these drivers?

They are ADT version of Görlich. I spoke in some extend about Görlich at my site, do the search. One of the ideas of Görlich was to make diaphragms with thin sheets of aluminum inner-layered with very fine layer of polypropylene and later Teflon. With a proper combination of aluminum layers (I think they used from 3 to 9 layers), with a proper selection of the driver size and proper rubber suspending the Görlich driver were very inversing. Inversing but in own way, but not perfect, as they had own sound and they mostly were not used properly.  ADT did pretty much the same Görlich but they used Titanium foils instead of aluminum. How good was move to Titanium? I do not know. The few Görlichs driver that I bought in past on Ebay were sold to me as “original Görlich” with aluminum foils, I have no idea if it was so.

Why I said that Görlich sounded “different” and were used wrongly. Well, it was the low resonant frequency that I think screw those drivers. It was around 60Hz for small driver and it lead people to use Görlich in 2-ways configuration. Magico monitor was a perfect example of 2-way miss-use, listen them and you will hear what I mean. As good Görlich was at strictly midrange (with some questionable tone) as dead it was when a driver was forced to care lower MF and upper bass. Görlich is excellent MF driver but why drivers that shell work above 300Hz shell have a resonant frequency of 50Hz? Well, those mislead many people. What I experimented with my Görlich I did the same mistake and I drove them to low. I did have a chance however to hear 3 way implementation with Podzus’s  Görlich. It was a small Italian company, I do not remember name, and the made a floor standing 3-way loudspeakers with Zellatron’s version of Görlich drivers. It was ported Scan-Speak twin bass with, one MF Görlich and one Heil transducer for HF. They were presented at CES sometimes in 2000 and it was the “lost show” for them. They were in some kind of side room and no one spoke English among those guys, they play crappy music. The hi-fi show in other words. The speakers were set up strangely with very surprisingly good MF. I was attracted to it and a friend of mine and I were articulated something to those Italians. I do not remember already how it was, but I remember that I was bitching about the very inappropriate bass – it was obviously that their if not mistaken 300B amp was not able to handle the port’s secondary resonance, the current resonance.  Those Italians somehow understood us and told us that they have a solution for this problem, inviting us to stop by in the end of the day when they might to show off “another amps”. We stopped by, I think after hours, and they indeed had a pair of gorgeous looking monoblocks with 211 tubes of their own made, it was not demod at the show. However the sound of those thighs was nothing short of wonderful. I literally had no bases for complain. Regardless to the fact that it was 8 years back and I was much less intelligent about sound and much less critical that I now I still feel that it was very good. The sad part that no one ever mention about that company after then but those Italians  truly knew what they were doing.

I presume that if Görlich would do 5 then I might try them for MiniMe in 3-way configuration but the sensitively of 87dB is relay keep all of it out of the ball park. Even two of them would be far from my targeted 95dB… I presume that if Görlich stay with 100Hz-130Hz primary resonance then they would have fewer excursions and pick 5-6dB of sensitivity. Then they would need to stiff up the suspension it will be better for MF but it will be a different driver as no one knows how the Görlich’s cone would sound hard-suspended.

The Cat

PS: Görlich Search


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
10-26-2008 Post does not mapped to Knowledge Tree
Lbjefferies7
Southern California
Posts 49
Joined on 01-11-2008

Post #: 62
Post ID: 8634
Reply to: 8628
Drivers-ATD v. Gorlich
fiogf49gjkf0d
So that's the story.  I've never really paid any attention to the Magico speakers.  I Googled their name and saw the words "Extreme Fidelity."  That instantly killed my curiosity and I did not continue searching.  Just another one of those I assume. 

These drivers, however, I will keep in mind.  I don't need them right now, but I am going to revise my "Mini" speakers for a second system (different location) and I have not decided how serious they should be.  I am interested in seeing Alexander's reasons for his omni-directional project...I have wondered before what a omni injection channel could do.  I might try it out, but I have reservations.

Thanks,
LBJ


I'm not interested in having an orchestra sound like itself. I want it to sound like the composer. Leonard Bernstein
10-27-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,184
Joined on 05-28-2004

Post #: 63
Post ID: 8635
Reply to: 8634
That’s the biggest problem in the whole MiniMe project
fiogf49gjkf0d
 Lbjefferies7 wrote:
… I am going to revise my "Mini" speakers for a second system (different location) and I have not decided how serious they should be.
From one point I would like it to be better, not because it need to be but because it is I interesting to try in a way. From another perspective there is no truly practical need for MiniMe to be better then “juts not too annoying”. This weekend I made some experiments with paints. I hate any non-black drivers and I decided to paint the white section of the MiniMe’s woofers. I found a right acrylic paint and while I was painting cone I was asking myself: what the hell I was doing? It was not my intention to convert it into full-blown DIY project. My abhorrence of DIY community derives mostly from the fact the 99% of them do it just because they do whoever is double and they very seldom pursue any meaningful Sonic goals. Those DIY idiots can argue for years about quality of caps in cathodes, about the elevenths distortions in app-amp, or about advantages of silver voice coils over cupper one. However, they never care to understand Sound not to mention to USE Sound. Well, bitching about all of it I do admit that in the MiniMe project I do not need any objectionable Sound and what I need might be literally obtained from a $30 commercial monitor, perhaps even an active professional monitor. So, what I am doing with the MiniMe and where I am taking this project?

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
10-27-2008 Post does not mapped to Knowledge Tree
Lbjefferies7
Southern California
Posts 49
Joined on 01-11-2008

Post #: 64
Post ID: 8636
Reply to: 8635
I know what you mean...
fiogf49gjkf0d

I too have no respect for DIY'ers of any type, and audio is certainly the worst place for such people.  I don't identify with or socialize among such people, or even audiophiles in general.  The only thing that motivates most of these people seems to be the fear that someone might either have a bigger income or a bigger dick.  When I think of DIY "speaker" builders, I can just see some worn-out Al Bundy look-alike in his garage cobbling together some piece of crap just hoping that it will impress/piss-off the neighbors when he plays Ted Nugent.  And he wants to talk to me about audio.  Perfect.

My interest is music.  I intentionally avoid commercial speakers that profess to be high-end.  I have heard exactly two "audiophile" playback systems for a total of maybe 5 minutes (some custom full-range planer speakers and Dynaudio Evidence, Classe, Nordost, grinning salesman system) and was unimpressed with the fact that neither of them played music in a significant way.  Audio was there, but no music.  Because I grew up in an environment of live, Real Music, working dilignetly to use sound of Real Instruments (pianos), I involved myself in the idea of loudspeakers as musical instruments.  I can no longer listen seriously with any other human being present.  Trying to explain my system to others has become impossible (for me, at least) and I know that everyone I know will probably never understand.  Music disappears when they are around and the entire effect becomes silly and frivolous...even though they say "it's great."

So here I am at the Tabula Rasa Loudspeaker University, not jerking off other people with sound and music...just myself.  The right music is perhaps the most rewarding and stimulating experience I will ever have.  An experience that is all mine, and only mine.

Now let's go discuss cable elevators!!!

LBJ


I'm not interested in having an orchestra sound like itself. I want it to sound like the composer. Leonard Bernstein
11-02-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,184
Joined on 05-28-2004

Post #: 65
Post ID: 8677
Reply to: 8634
The new Podszus Görlich
fiogf49gjkf0d

Do you European guys know anything about this German company?

http://www.micro-precision.eu/index.html

It looks like they have new production of Görlich drivers and it looks like they use aluminum.  It looks like they do it for automobiles, which is fine.

The series Z look attractive:

http://www.micro-precision.eu/6.html

 and they have 4 sizes of Görlich drivers. Could somebody learn what is the sensitivity of this driver:

http://www.micro-precision.eu/7.html

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
11-02-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,184
Joined on 05-28-2004

Post #: 66
Post ID: 8684
Reply to: 8463
Port’s weight. Important? Not important?
fiogf49gjkf0d

I was thinking and thing about it and eventually the amount of garbage thrown around my room was overwhelming and the only solution was to put all that garbage in trash or into some kind enclosure. Well, I decided the later and the MiniMe project is on it’s way. So, 3 days back I met my machinist and gave him all drowning of MineMe, placing the order. Since I finally went for G10 material it will take for a while – perhaps 2-3 weeks to have it done. Ok, I am not in hurry…

I decided to use juts one port and it will be 2” post, if I target 40Hz then it will be not too long pipe – approximately 3-4 inch. I will be using doable-flared port made from ABS. What inters me is if the port flare and the port’s pipe need to be mass-loaded or something like this? The pipe and the flare will care quite strong back and force reaction, so why do not make it from heavier mater then just flimsy ABS? Sure I will not re-do the port from bronze but I wonder if it makes sense to beef up the port, wrapping up some wavy staffing among it. I have quite good result from past what I was calming down horns by wrapping belts around them inner-layered with lead. Does it make sense to use the same techniques for the plastic elements of port?

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
11-02-2008 Post does not mapped to Knowledge Tree
Antonio J.
Madrid, Spain
Posts 272
Joined on 08-16-2004

Post #: 67
Post ID: 8686
Reply to: 8684
An inexpensive option
fiogf49gjkf0d
would be lining the port, probably its outer surface looking at the enclosure's "void", with Dynamat Xtreme. Depending on the enclosure resonances and own port's sound it could be useful placing some Dynaxorb sheet inside the enclosure at the opposite side of the port or the woofers.
I've tried the Dynamat Xtreme sheets to tweak some headphone's cups and it works very well to get rid of nasty resonances from the own enclosure.

Rgrds
11-16-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,184
Joined on 05-28-2004

Post #: 68
Post ID: 8870
Reply to: 8138
The freaking economy!
fiogf49gjkf0d
Yesterday my machinist called me with apologies. His original estimate for the MiniMe material (I went for G10) were around $700- $750. It was no BS as we were looking is big fat book with the actual prices. He said that the price for G10 during the last 2 months went up very dramatically. Well, it looks like that only material for MiniMe will cost $1850 – that is much more than I expected from a quickie mini-monitor. Honestly if I did not get all drivers already I would probably abandon the project. I do not know if I need a MiniMe pilot-monitors with $4.5K price tag. It looks like I got myself on a hook…


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
11-16-2008 Post does not mapped to Knowledge Tree
scooter
Posts 161
Joined on 07-17-2008

Post #: 69
Post ID: 8872
Reply to: 8870
Wait...looks like short-term price spike
fiogf49gjkf0d
Hi Romy:

I won't do any research on this price spike in G10...but this looks like the classic commodity short-term rise which will correct itself in due time. See recent correction of other volatile commodities (corn, soybean, oil, copper, etc.).

The G10 price spike could also be the result of some plant outage or huge recent order, which is self-correcting. Regardless, given the slowdown in the world economies, commodity prices will have significant downward pressure over the medium-term.

Why not wait a few months to see if prices settle?
11-16-2008 Post does not mapped to Knowledge Tree
serenechaos
lost alamos
Posts 86
Joined on 12-01-2007

Post #: 70
Post ID: 8876
Reply to: 8870
Freaking G10
fiogf49gjkf0d
I'd just make it out of something else if not already commited...
But then I don't like G10 in the first place... 
What is that, $50 - $100 worth of baltic birch?
For better damping, quick & easy to work... 
(just being a smart ass). 
11-16-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,184
Joined on 05-28-2004

Post #: 71
Post ID: 8877
Reply to: 8876
The gambling on G10
fiogf49gjkf0d
There are a few reasons why I deeded to go for G10. I like the G10’s “wet on touch” feeling. The G10 has similar to the MiniMe’s bass drivers “texture” when I scratch it. The shape of the enclosure I decided to make would be difficult to do with wood as I would like to angle the corners. It will look sexier with G10 and will hold the shape better. I might use thinner G10 walls then wood, since I would like to have the MiniMe with as small as possible footprint then it is a big deal for me. I know how wood enclosure sound but I do not know what difference architectural plastics would make. This is a gamble is a way….


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
11-28-2008 Post does not mapped to Knowledge Tree
el`Ol
Posts 225
Joined on 10-13-2007

Post #: 72
Post ID: 8999
Reply to: 8677
Görlich test at Hobby Hifi
fiogf49gjkf0d

There is a test of the 17 cm Görlich with rubber surrond in the new Hobby Hifi.

Very low fs (23 Hz) and low sensitivity (86 db). There is a clear surround resonance, so maybe it would be wise to wait for the announced models with cloth or foam surround. The membrane material seems to be really unique: The diaphragm has a resonance at 4-5 kHz that is also clearly visible in the distortion curves, but it is dead after 1 ms! BTW: It is a hard foam and the aluminium foils are just covers that are necessary because it is open pore.

There is also a test of the cheaper brother of the Magico Mini´s fancy looking midwoofer. It has a carbon/kevlar mesh diaphragm. The very low Rms indicates a low loss rubber surround, but is lacking surrond resonances. In the upper midrange the CSD is slower that the Görlich´s, however. From the distortion figures I don´t believe there can be anything wrong when used properly (as midrange!). Personally I have listened to the Veravox 5 highpassed with Shindo electronics, and I couldn´t find any tonal error, so I believe ATD definitely CAN build good drivers.

12-30-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,184
Joined on 05-28-2004

Post #: 73
Post ID: 9305
Reply to: 8138
It is time to think about the MiniMe Crossover.
fiogf49gjkf0d
The last nigh I stopped by in the shop of my machinist. He did not finish the MiniMe as he is keep experimenting with better glue to assemble the MiniMe enclosure. All sides are prefabricated and are ready to glue, BTW, the G10 material turned out to a very cool thing and I was holding the side with a sense of a big curiosity hot it might sound. My machinist BTW was cursing anybody who suggests G10 to me as it WAS the pain in ass to cut it.

Anyhow, I begin to think about the crossover foe this thing and here is my first draft. It does not rely upon anything auditable or measurable and it is the initial setting how I think to start.

MiniMe_Crossover.jpg


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
12-30-2008 Post does not mapped to Knowledge Tree
Lbjefferies7
Southern California
Posts 49
Joined on 01-11-2008

Post #: 74
Post ID: 9309
Reply to: 9305
MiniMe and Machinists
fiogf49gjkf0d

Jeeze, I just mention G10 and every machinist out there wants my head delivered to them on a silver platter!  Diamond tooling does help but I'll have to ask the guys I know with waterjet cutters if they have had any problems with it.  I'd think that would be pretty painless.  I would normally mention 3M ScotchWeld 2216 B/A as an adheasive, but I don't know how pissed everyone would getSmile

Good Luck and Happy New Year

LBJ


I'm not interested in having an orchestra sound like itself. I want it to sound like the composer. Leonard Bernstein
12-31-2008 Post does not mapped to Knowledge Tree
serenechaos
lost alamos
Posts 86
Joined on 12-01-2007

Post #: 75
Post ID: 9312
Reply to: 9309
G10 nightmare & xover
fiogf49gjkf0d
G10 also makes a nasty mess after you've cut it, get's all over the machine, fine "stuff" in the fluid...  nasty to work with unless the end justifys the means. 
so it's fun to bitch @ anyone wanting to use it, that the only thing gained by using it over other material is an interesting "coffee table piece" to rub and stroke; can't you stroke something else, etc.  Ongoing shop joke. 
Like the mercury turntable would be a good use of exotic material if not toxic. 
We have lots of really exotic materials @ work, with "interesting" properties; like Plutonium, and some new, man made elements that aren't even on the chart yet. 
Really pretty stuff, and very heavy, would make a great turntable platter. 

How did you come up with this baseline crossover configuration? 

Romy said: "It does not rely upon anything auditable or measurable" 

Did you use LEAP or anything like that, or just cross everything over 1st order as a guess, and tune by ear? 
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