by Hugh Robjohns » Thu Jan 16, 2020 4:57 pm
Mounting any speaker on a decent isolation stand will always bring great improvements compared to just plonking it directly on the desk, for a variety of reasons.
And those IsoAcoustics stands are extremely good and I happily recommend them. You'd need different (or reconfigured) stands for the KH310, though, because of its wider base. It would probably be a little unstable on stands built for the KH120.
But critically, the KH310 is quite a different beast to the KH120. It's a sealed cabinet and a three way design, and they are significant factors.
Yes, it has a greater bass extension... so in most situations you just don't need a subwoofer at all, and thus don't need to be concerned about the matching intricacies of blending a sub with the satellites.
If you really want the flatter mid-band frequency response and tighter impulse characteristic that a notional KH120 DSP would provide, then either buy KH80s now -- there is no practical difference in usability between the KH80 and KH120 when used for nearfield monitoring -- or invest in one of the third-party room correction systems.
Easy peasy...
Personally, I'm a huge fan of the Trinnov Optimiser... because although it's not cheap, it really does do the best possible job!
However, staying in the antiquated world of analogue speakers for a moment, the KH310 provides a noticeable step up from the KH120 in terms of mid-range clarity and resolution, as well as a greater bass extension... There are genuine benefits to separating the bass, mid and treble to their own optimised drivers. And it may well be that these speakers can provide you with whatever it is you're seeking....
Decisions, decisions....
The one thing I can say is that if you can buy the KH310s at a good price, you're unlikely to lose money on them if you decide to move them on and stick with what you have now, or invest in KH80s instead...