Watts! How many do we need?

Got a new amp. Accuphase P-4600. It’s great. I love it. 
150 watts into 8 ohms, 300 watts into 4 ohms and it has meters so I can see wattage. Have them set on freeze so I can see the highest wattage during the session.

My Harbeth speakers are not very efficient. Around 86db. Their impedance is an even 6 ohms dipping no lower than 5.8 ohms. 

Playing HiRes dynamic classical recordings  ( Tchaikovsky , Mahler) at room filling volumes I have yet to exceed 1watt.. 

Amps today offer a lot of watts some going to 600 even 1200 watts. Even if you have inefficient speakers with an impedance that dips down to 2 ohms do we need all this wattage or should we be focusing on current instead? 


As I think I remember @ghdprentice  typing, I have also read that maybe not all watts are created equal.

👍 @immatthewj I did mention that and I think @curiousjim ’s dealer is trying to make Sonus Faber sound more like Wilson. I think he is trying to put so much fast current to them (and probably a lean midrange) to increase slam. These speakers are made to reproduce natural sounding music not to do shock and awe. I know it is hard to attribute intent to others. But I have heard SF with very high powered solid state amps, they do make them sound better to me.

@immatthewj   Actually, all watts are the same.  There's a scientific calculation that defines a watt.  It's all the other stuff that makes the difference.   

@bigtwin -- I appreciate your points, but high wattage alone doesn't tell you anything about how an amp behaves when presented with a low impedance load of 4 ohms or under.  And wattage also says nothing about the other elements of sound quality. 

Especially since I don't listen at high levels (85 dB tops) I happen to enjoy my 20 w/ch (8 ohms) Aegir more than the 150 w/ch VTV amp I had immediately prior.

To use a car analogy, it is like focusing only on horsepower while ignoring torque, gearing, suspension, handling, braking and so on. (Of course, the same as with audio buffs, there are some car enthusiasts that will focus only on one trait.)

@bigtwin  , is an unltralinear watt identical to a triode watt?  That's a serious question, I am not intending to be sarcastic.