How much power needed to drive 91db speakers?

@quincy 

Sorry.  Somehow I missed your post. Before the Sonus Farbers, I had a pair of KEF Reference 5’s and they were very dynamic.  Normally I don’t play loud, but the other day I played Tricycle by Flim & The BB’s for my wife.  Don’t know if you’re familiar with the tune, but it starts off with a piano playing and then it gets LOUD for a second and then goes back to the piano.  My amps are class A/B. The first 10 are A and Class B up to supposedly 600 at 4ohms. Other than having to scrape my wife off the ceiling everything sounded great.

Do you think your amps could handle the dynamic range when played loud?

Thanks.

@curiousjim   I believe so.  I also have a pair of very nice SVS unported sub woofers working in the system as well.  They have their own Class D power amps rated at (If I recall properly) 600 Watts x 2.  I have a tendency to play my music louder than normal since my hearing is less than stellar.  

@niodari 

See the post above I sent to @quincy . My amps are Class A for the first 10 watts and I rarely use all 10, but I’m sure I went wayyy above the 10 when I was playing tunes for my wife.😁 I might have hit 50 watts or I may have hit 300.  I didn’t check the dbs. Maybe I should have.

Out of curiosity, have you ever played Tricycle on your system?  If you do, keep the volume way down the first go round.

@curiousjim Take care of your ears. Above sone threshold, the louder you listen the more is the distortion, you can note this even in live performances, more in home audio. I didn't put that track on my system but I can try if you are interested in some particular performance issue. At this moment I'm listening to Mozart's symphony 41 on LP and would like to continue. This morning I listened to Ozzy Osbourne's late (2001) solo album.  It is recorded too loud,  I listened it also quite loud (my wife was not at home!) on my SS class d amplifier. The distortion during the recording session is quite notable. But it is somehow unavoidable in this kind of music. Surprisingly, some tracks on "Master of Reality" are better recorded.