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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
springbok10
711 posts
 
>>05-21-07: Atmasphere
Anytime you are investing in tube amplifier technology, that investment will be best served by a speaker that is at least 8 ohms or more.

Tube amps, with rare exception, have reduced performance into four ohms. <<

So, it seems that in general, Tvad is correct. Even though the Atma-sphere MA 2.2 may well drive the Woodmeres 4 ohm impedance to acceptable levels, the inference is that it would drive the Defintion AFI with 30 ohms impedance a helluva lot better. Furthermore, the 60 day in-home trial of the Defintions are a huge plus. Almost essential. So now will anybody give me their impressions of the "sound" of the Zu Definition, since there seem to be divided camps on this issue?
Thanks.
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04rdking's avatar
04rdking
178 posts
 
This has been a very interesting thread.......

Having said that, my Primaluna PL2 with KT88's, 40wpc, has no trouble driving the Proac D15's, 88db, to louder than WAF levels in our 15 x 30 x 10 room.

Bartokfan,
Did you ever bias those tubes?.....
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