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
Pauly,
Your last post was one of the most helpful & educational from a practical standpoint the I've read in a long while.

Bartokfan, it might take a long while(i.e. months, not a few minutes w/Google) to fully appreciate how well Pauly broke it down. Yes, it's true that there are many types of tubes, tube amps, etc. Each of them will react to cabling, speaker matching, room matching etc. You just can't conclude too much from a small bit of exposure at a show, in a dealer's showroom, etc.
My best advice for you is to seek out a local audio club, and spend much time listening to others' rigs in their homes. Slowly but surely, you will learn which element of various designs are to your liking(e.g. SET vs. OTL vs push/pull). Cheers,
Spencer
Duke, apologies for that crass comment on what you actually do, which is build a fine speaker. Please excuse my lack of discretion. Paul its true I only have limited exposure to different tube amps, so will reconsider the SET's and other tubes on orch music. This is an issue with audiophilies, we can read about certain fantastic tube amps, but almost no opportunity to audition them.
>>which is build a fine speaker<<

He very well might but you've never heard them. Your opinion is irrelevant.

>>Paul its true I only have limited exposure to different tube amps<<

You have limited exposure to almost all audio components. Listening, not reading, is the key.

>>will reconsider the SET's and other tubes on orch music<<

It's not the tube or the amp; it's the speaker/amplifier combination whether you listen to Bach or Iron Maiden.

>>we can read about certain fantastic tube amps, but almost no opportunity to audition them.<<

Back to my second point. There are plenty of opportunities to audition. You have to get off of your a** and join an audio club, attend a show, or drive a couple hours. Don't say "we" when in fact it is "I" you are speaking about.
Audiofeil I ceratinly cannot argue any of those points ......and feel like I've won anything.
Do not allow my digressive comments and short sightedness keep us from gaining further understanding of this important subject. I am learning something here. Things maybe covered in other topics, but not sure where to look.
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.