Nearfield Low-Level Listening : New Speakers or EQ? Thoughts?

I'm now an apartment dweller and low level listener.  Using Omega Speaker Systems Super 3i Monitor on stands behind my desk, REL T/5x subwoofer and a DIY SET triode tube amp.  Very satisfied with this.  

I stream from a Mac and use Apple Music's equalizer to boost the highs since I have some hearing loss.  

I've found this a very satisfying and not too expensive combination.  

I have Harbeth 40.3 XDs, a pair of Rythmik E15HP2 subs and an Accuphase E-800. The sound is wonderfully lush, soothing full and detailed at low levels. I think the Harbeths are 85 db (not super efficient) but easy to drive with an impedance range of 6-8 ohm. I had a pair of Harbeth SHL5 Plus as well and they also sounded full, lush and detailed in the 70 db range. I had larger more efficient Focal Scala Utopia EVOs and they were not as enjoyable at low levels.

I do most of my listening at low volume levels in a nearfield setting (>12 hrs/day), so I have experience with this. A couple observations:

• It's true that some speakers sing better at low volume than others. I've had a run of sealed/acoustic suspension speakers that do this very well. They were all 2-ways of varying size: NHT M-00s & matching sub (powered); ATC SCM12 Pros (passive); and vintage KEF 103.2s (passive). Currently I'm using a front-ported design that also sounds quite good at low volumes, the Harbeth 30.1s. But I've also had speakers here (all ported, whether passive or active) that sounded terrible until cranked.
• Same for amps. I'm on my 2nd class D amp (Bel Canto 600M monoblocks). The first was the Wyred 4 Sound ST-500 stereo amp. Very different designs with a few sonic differences, but both sound great at low volumes
• And a recent discovery, more or less by accident: I have a TVC (transformer volume controller/preamp), and when I use it as a trad preamp with the volume pot set very low, the sound coming out of the speakers is even more expressive and dynamic than I'm used to. I'd read about this, but wasn't prepared for how true it is. At higher volumes the sound is not anything special, but at low volumes, it's definitely special

The biggest factor is luck. Really. I just got lucky to land on gear that sounds great at low volume.

@gemoody, You're probably not going to like what I tell you. Most people find that speakers 'wake up' or 'come alive' when you crank up the volume because fine detail is obscured or missing at low SPL.

If I'm not mistaken only @asctim has mentioned room acoustics. Forget EQ it can't solve your problem. Sort out your acoustics and introduce at least two subs which will allow, when properly set up, room filling sound with all micro detail intact and bass that will amaze with its tight informative performance.

Note: I mentioned properly set up. To achieve this get yourself a microphone and download the free REW from the net. The mic. will set you back about the cost of a decent meal. Too much to go into here but it's the only way to elevate what you have. I do not think you need new anything because your room will not have changed therefore neither will your sound. Sorry to inform that new speakers will just supply a slightly different perspective on you existing issues.