High Efficiency Speaker Asylum

What amp and what speakers and what music?

209.214.20.176

Russ57

In Reply to: RE: Is 90db sensitivity enough..... posted by makscopes on May 26, 2007 at 21:37:36

As some have hinted it depends a lot on the type of music/recording and its dynamic range.

Ten watts is an unusual number for a class A(1) tube amp, what do you have? Also the impedance of the speakers is often more important. So really more info is needed.

Russ

Follow Ups:

RE: What amp and what speakers and what music? - makscopes 06:26:45 05/27/07 (4)
The amp is a Sophia Electric Baby. The speakers in question are B&W 602 s3 so they are an 8 ohm load.
- Sophia baby & 90 db: my experience - AmanteDiMusica 15:34:29 05/27/07 (2)
  I have actually heard that amplifier with, believe it or not, 90 db speakers, in a medium sized room. The particular setup I heard ran out of steam, especially in the bass. I'd use at least 95 db with that amplifier.
  Grazie
  Amante
  - RE: Sophia baby & 90 db: my experience - makscopes 17:21:08 05/27/07 (1)
    Amante,
    
    Thanks for the reply. I think that you may be right. I was using the baby amp with Klipsch Heresy's, and it got loud enough, but barely so. Would a solid state amp - like a HK430 work better (its 25wpc but has a twin powered design and sounds like a much bigger amp)?
    - RE: Sophia baby & 90 db: my experience - AmanteDiMusica 07:24:49 05/28/07 (0)
      HI Makscopes,
      I think the 25 watt solid state would work better than the Sophia, in terms of bass. You should keep in mind it would probably not give you that "tube" magic you are looking for. One other option is to look at a good push pull amplifier, using el84 or el34 tubes. The ones with toroidal output transformers tend to have good bass response and still provide that tube depth to the sound.
      Check out
      200113279610 on ebay as an example of such an amplifier.
      Grazie
      Amante
- that is NOT a stable 8 ohm load- guaranteed - stuck.wilson@gmail.com 08:17:05 05/27/07 (0)
  definitely 8 ohms nominal-- but B&Ws have multiple impedance peaks, and my tube amps HATED them-- the 601 and the cdm1se. consequently.. me too.. they're long gone!
  
  the NOMINAL impedance listed is fairly farcical-- see if you can find a REAL graph to see what's going on if you're interested.. but from what i used to hear when i lived with with them-- they were monstrous compressors, and not really suitable for low watt amps with the big impedance peaks. they'd definitely get shrill as a firehorn when under stress.. which didn't occur with some big watt SS amps to the same degree.
  
  i think a lotta folks run headlong into the 'modern standard' of squirrely impedances when they start down the tube road... all of a sudden, speakers sound wierd... and you definitely realize that there's a major standard mismatch!
  
  yrs
  
  d

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