High current amp search

The simple explanation is a less efficient speaker requires more power from the amp. Regardless of the amplifier technology, the fact is that the amp really shouldn’t be working hard for a living if you want the most sonic performance for the dollar investment. 

OTOH if you simply want to see how well an amp holds up under adverse conditions, no worries. But don’t expect the best sound you can get out of the amp or speaker as a result. To me that seems a waste of $$$$$

@atmasphere You completely miss the point that a feeble little amp could run all day long into that 83dB sensitive sealed enclosure speaker with the "benign" 5ohm impedance response and be none the worst for ware except as you say "don’t expect the best sound you can get out of the amp or speaker as a result" but it certainly wouldn't "working hard for a living"! The high current amp driving the Wilsons is still going to have it's moments and run quite warm while doing so.

Furthermore, to think that you as another poster said "Your posts often appear to be casting pearls before swine." to patronize the OP who probably is doing nothing more than blowing smoke up everyone's butt just to have something to do while you continue profess your quite sketchy knowledge on the subject.

@faustuss Your first paragraph needs clarification.

A lot of people probably think my knowledge is sketchy and there are many things I don't know. I try to avoid talking about those things until I learn more. I am interested to know what you think is 'sketchy'. 

@atmasphere wow! those speakers are quite massive. To be honest my speakers actually are quite sensitive at 94 DB but the impedance does dip to around 2.5 ohms in the bass and as I have found out quite a few amps I've had here have trouble reproducing the bass correctly. I've sold my current amp and right now I'm using my friend's Adcom gfa 555 MK2 and while I actually quite like it, it doesn't do the bass any justice. 

@lukaszwk  If your speakers have dual woofers that might be where things are getting in trouble. One disadvantage of low impedance speakers is the speaker cables become far more critical. The series resistance they have while seemingly slight, has a far greater impact on the speaker performance if its impedance is already low. 

This means that if you have 4 Ohm speakers its a good idea to keep your speaker cables as short as you can! 6' is a common maximum. 

If its a nominally 4 Ohm speaker and uses dual woofers, they may be in parallel thus bringing the impedance of the bass array down to 2 Ohms. It might be a bit higher in practice due to box resonance. This is speculation since so far you've not mentioned what speakers you own.

The other possibility is the crossover has a dip and/or there's an odd phase angle in the bass region that asks more of the amp. If the latter you simply have to get an amp that really doesn't care about the load.

There are class D amps about that tick the boxes you require and are also load invariant. My recommendation in that regard is look for one that is 'self oscillating' as they tend to be load invariant while those that are not of that type are less so.  

There is one other thing. If your speakers are in a room of regular dimensions you may be dealing with a standing wave (like I was) which is killing the bass. If you move about the room are there places (like along the walls) where the bass is better?

@atmasphere the speakers have 3 woofers per cabinet and yes, there is an odd phase angle right in the bass region and also yes they are wired in parallel. The amount of bass isn't really the problem it's the quality of it as in undefined, smeared and wooly. The class D amp I have recently let go of had none of those problems but it was deficient in other areas, as in slight grain in the highs and occasionally too forward in the mid-range. Btw they're Klipsch palladium p37f.