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Tube amps and speaker ohms

In your opinion , do push pull amps work better with 8 ohms or 4 ohms. .I am under the impression the lower the ohms, the more power is demanded from the amp....Another question, are there low powered SET amps ,and high power SET amps?
I'm looking at a 40 watt 845 tube amp for my 8 ohm, 89 db speaker.. just cked the Thor has a 86 db W18 midwoofers(2 per cabinet) and a 88 db tweeter. Will an 845 amp rated 40 watts be able to drive the 86/88 db speaker? With authority, bass, mids, highs, in dynamic sound stage? Synergy? Or poor match?
bartokfan
hiend2's avatar
hiend2
438 posts
 
No 40 watts will not drive a 89 db speaker. Push pull or single ended. I have a speaker at 96 db and 200 watts push pull is just enough. Anything less its clippsville.
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stevecham
3,340 posts
 
Hiend2: I use 45 watts a side from a CJ CAV50 to drive my 86 dB Vandy 2Ce Sigs in a moderately sized room and I have very little trouble hitting my comfort zone of 80 dB in my listening position about 10 ft from them.

I don't know where you get that opinion unless you listen to Metallica at concert levels (120 dB), then it all makes sense.
audiofeil
4,011 posts
 
>>No 40 watts will not drive a 89 db speaker<<

Not true.

Depends on the speaker and the amplifier.
bartokfan OP
664 posts
 
My JOR is,, well the one I sold...is rated 40 watts "conservatively" as they say...does "manage" to drive the 89 db speakers. However since i never biaed the unit, I am not sure there was more highs it could have achieved. On jazz, pop, R7B there was authority. In big complex orch I was always looking for more authority. So the 40 watts was never enough to make the orch "bloom". This is the only reason I sold the amp and looked for more power. I was say a "normal" 40 watt tube amp is not going to deliver the goods on a 89 db speaker. I always felt there was more in the orch that was not comming through.
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