GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.

Post Subject: VERY alarming behavior. Too early to close up the thread.Posted by Romy the Cat on: 12/2/2010

Romy the Cat wrote:
Probably the whole thread about the evil electricity might be coming to it’s logical end…

Today turned the playback and I was surprise with gray and unexpressive bass. “What the hell?”- I asked myself. There was absolutely nothing done to playback but I look like I lost bass. My initials sentiment was that at cold temperature my drivers in midbass horn in attic got too stiff. I check with my radio transmitter that I left in back chambers and it looks like both temperature and humidity were fine. Then I stick a scope in power line. The AC was pretty bad, not the worst I have seen here in West Woburn but bad, with a nice horizontal square atop of the wave. The wave after the PP2000 was fine of cause. So, what is the problem I wondered? After some thinking I made a conclusion that the problem is most likely that PP2000 is semi-transparent to the AC problem of externals line, despite that it outputs a fine wave shape.

The only experiments that I was able to do is to run PP2000 from buttery and compare it to what PP2000 does what it runs from AC. This time it was very sorry unfortunate test. As soon I shot down at all 3 PP2000 AC input and the PP2000 switch to own battery I immediately got my bass back. It was so obvious and so apparent that it count not be even second thought what was the problem. I was listed a few opening bars of Tchaikovsky’s Second Movement of the 5th symphony (guess by who?). The opining cellos and basses has a lot of texture, transients and “strings bite” when playback runs from PP2000 buttery. As soon the PP2000 is switched to run from AC all bass colors are gone, the values of transients are filled with gray noise and the distinctions between the bass notes are virtually gone, Sound become boring like hell…

So, something is certainly is very wrong. The very first PP1500 unit that I got 3 years back had absolutely no difference in sound between running from butteries and running from AC. My unit #7 that was very nicely working in my home foe over a year had very minor between butteries and AC, practically negligible difference. Those 3 new units had huge between butteries and AC. I am afraid that PurePower peoples loaded capacious into the units to suppress the HF residual spikes that they had from buttery charger and accidently they killed the Sound of the things. I mention it because you will have the absolutely the same effect if you add capacitors to the primary of your PS transformer – shunting caps on AC lines kill bass…

Anyhow, I am not convinces that it is the PP2000 fault – I have 3 units and I need to make the same test running everything from one units as 3 units give some ambiguity. However, there are very strong evidences that the last PP2000 has issuers. I might not detect it when my AC will be in better shape but today ether my AC or the PP2000 running not from butteries are truly horrible. It is sad as I did not sign for THAT.

Rgs, Romy the Cat

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