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In Reply to: RE: Sanders Magtech Amp posted by erik_sq on October 05, 2016 at 18:42:50
The PSAudio integrated used a proprietary 'Gain Cell' as the input section.
When I went the Parasound route, I ALSO got the new P5 preamp.
The 4ohm characteristics of the ICE amp was what I THINK got me. I was never satisfied with the highs. I suspect some interaction with my Maggies. And I messed with setup for a LONG time. Tweeters in/out and pole piece front/back. The frequency rolloff causes phase shift and almost no matter what, I had picket-fencing (audible)
Too much is never enough
Follow Ups:
I was never satisfied with the highs. I suspect some interaction with my Maggies.
Or, perhaps it is due to the use of boatloads of negative feedback necessitated by switching amps - while John Curl's designs are of the minimal FB design.
From my perspective, that is the Achilles' Heel of switchers.
Well, since almost all switching amps use negative feedback (as do the Sanders amps I'm aware of) that's kind of difficult to prove or disprove.
Also, most amps with zero global feedback still have some local feedback, which is what digital amps use, I believe.
Also, I'm just not convinced negative feedback in and of itself is a bad thing, but buy what you like.
Disconnect the wires to your tweeter and watch it go into oscillation ...
Maybe that's it. My current speakers go to 4 Ohms in the base but around 10 in the treble.
I doubt it is simply impedance which would cause a problem unless it drops to <2.5 ohms.
BUT, what might cause problems is the reaction of the amp to a highly reactive load.
Just a guess.
Too much is never enough
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