Planar Speaker Asylum

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Planar Speaker Asylum

RE: One main difference not discussed ...

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In Reply to: RE: One main difference not discussed ... posted by morricab on March 30, 2008 at 05:12:31

"Is that Class D amps do not need any negative feedback to work properly whereas all Solid State Amps need anything from 20 to 40 dB"

Ummm, yes they do.

The Class D amp I heard was zero neg feedback.

"but the problem with them are that they are bandwidth limited and they can not drive low impedance speakers."

Ummm, some of them are not bandwidth limited and some can drive low impedance speakers (not that Maggies are particularly difficult loads).

Show me some tube amps with zero neg feedback that thrives on 1 and 2 Ohm loads. Quad 57s and Sound Lab speakers.

Follow Ups:

RE: One main difference not discussed ... - morricab 04:13:31 03/31/08 (2)
"The Class D amp I heard was zero neg feedback."

Which one was that?

"Show me some tube amps with zero neg feedback that thrives on 1 and 2 Ohm loads. Quad 57s and Sound Lab speakers"

Thrives? Well that is a strong word. Adequately drives this I can show you.

I use Acoustat Spectra 2200 and 4400. These drop to 2 ohms in the bass and below 2 ohms in the highs. My KR Audio VA350i drives them just fine with tight controlled bass and clear open highs. No problems. Quad 57s would also be NO problem (in fact the original Quad amp was tube, low powered and designed to drive Quad 57s). About Soundlabs I am not sure but my experience so far suggests that in a moderate sized room it would work.
- RE: One main difference not discussed ... - KIS 06:21:21 03/31/08 (1)
  "original Quad amp was tube, low powered and designed to drive Quad 57s"
  
  Remember we are talking about zero neg feedback, The Quad II if I am not wrong has about 12 or 18 dB of Global feedback.
  
  I used the Spectra 2200 before and it is an much easier load.
  
  Is your KR amps zero Nrg Feedback?
  
  The best zero feedback amp I have heard is the Hurricanes driving the 57.
  - RE: One main difference not discussed ... - morricab 02:51:34 04/01/08 (0)
    "Is your KR amps zero Nrg Feedback"
    
    Yes it is. Remember though the Spetra 2200 drops to 2 ohms in both the bass and highs.
    
    "The best zero feedback amp I have heard is the Hurricanes driving the 57"
    
    I am sure that sounds really good.

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