Recommendations for speakers that sound great at lower volume levels.

Loudness controls are an interesting topic.
They have been universally denigrated by audiophiles.

But it is true human hearing has less acuity at frequency extremes - demonstrated by the fact most of us can hear nothing at all above 25kHz or below 12kHz.

But that is how all of us hear everything from birth to death.  So do we benefit from changing that pattern for listening to music?  An obvious response is that the hard of hearing benefit from hearing aids.  However this is not a reasonable comparison with those of us with normal hearing.

A mid-point perhaps is those who are older and suffer from natural detrioration of HF range and intensity.  There may be benefit in increasing the intensity of the HF signal.  This was achieved by the treble control, which with its LF parner has been out of fashion many years now.

Hard question to answer without knowing what kind of music you listen to and what your expectations are.  I've owned the SHL5s, but now I'm using P3s in the same room and I think they do better for low volume playing.  But, IMO, if your amp sounds good with your speakers at higher volumes, I'm not sure a more powerful amp is the answer for lower volumes.  A loudness control would be best, but alas. 

Interesting. I had no idea how much I would come to value the Loudness button on my new Luxman. One of my musician buddies called it a "guilty pleasure" the other day and I couldn’t help but laugh. I keep it on up through about 75db listening threshold, curious if that is "low volume" to many of you.....

@clearthinker I would say "had been denigrated by audiophiles" as to me it seems they are back in vogue just a bit. Look at PS audio YouTube vid on this concept.

Agree on the overall statement that Loudness + sensitive speaker is likely your best outcome.

Every single loudspeaker you will ever own will do the same thing. Actually, it is not the loudspeaker. It is your ears. Better yet , it is everyone's ears. Google Fletchur-Munson curves.
What you need is loudness compensation. Older preamps usually offered a single level loudness filter but in the "No Tone Controls" era the filter was dropped. Consequently, if you want a recording to sound right you have to play it back at the volume it was mixed at which depends entirely on the mastering engineer. Loudness compensation will give you a lower volume that the recording will sound "right" at. In the digital era this is easy to do without adding distortion and ruining the image. Those with room control can program their own loudness curve into one of their presets for times when they do not feel like shaking the shingles.