Low level listening

It has much more to do with noise floor than one would ever have thought. High eff speakers used with too much power are problematic as well since there is a fixed noise floor on any component and when a powerful amp is putting out small amounts of power on very sensitive speakers your sn ratio drops dramatically. This crushes dynamics and makes the output seem dull and not separated from the noise floor or worse yet switching distortion from imbalanced complimentary devices.

The other thing I find is unless your gain structure is worked out well and you have volume pot on your preamp or source up around 12 o'clock or higher you are loosing SN and dynamics. 

Easy solution is an autoformer VC. Unlike a pot you do not burn signal through resistance to attenuate to a listening level. Burning signal through resistors creates noise. 

Just reiterating about Magnepans and low-volume listening.

I had the LRS (first edition) and switched to the 1.7i, they definitely sound better to me at lower volume levels, either with, or without a pair of REL T7/x subs in the mix.  Low to medium volume for me.

Same room, same gear, driving CSS Criton 1TD-X stand-mounts and I find I want those babies cranked up.  If I want to listen loud they are much better than the Maggies.

FWIW, the 1TD-X have more definition, clarity, "air" or whatever, they just sound better and I can more easily pick out the individual instruments/voices.  Bass is much better defined w/wo the subs.  Bass tone is definitely better. bells, triangles, cymbals sound more defined and natural.  Singers are right there

The 1TD-X are less than 1/2 the cost of the Maggies and will fill a small/medium room with sound.  They are as inefficient as the Maggies and need lots of juice to get them going.  Just my 2 cents.

I highly recommend the Tannoy Legacy Eaton stand mount speakers. They sound great at low volumes. The 10" driver and wide baffle could have something to do with it, who knows. I typically don't listen very loud, so these speakers have been the right choice for me. They will play reasonably  loud when asked to. They also do not require a ton of power. 

btw, my comments about Fletcher Munson, and 'Loudness' relate to very low listening. That's when the Bass player starts to dissapear.

Many here must consider low listening as what many of us would consider normal.

I have found that the idea of speakers sounding their best at low volume level depends on the amplifier as much as it does on the speaker.  This is regardless of Fletcher Munson or relative volume of frequency adjustments.  

For example class D amplifiers tend to require higher volumes to come alive in the bass regardless of speakers.  

Class A amplifiers tend to do the best job at lower volume levels as do robust Class A-B designs that are stable to very low impedances.  

That said there are speakers that do a better job too- mainly higher efficiency designs 89db and higher including your Tektons.  

Your Tekton speakers should be capable of quality low volume listening and if they do not, look to your amplifier as the reason.