Just my two penneth for what it's worth....I was at exactly the same place as you are at with your system (albeit, my components are very different than yours)....I was on the verge of packing it all up and selling it on AG. I've posted a few threads in the past, basically moaning and groaning about having to drag my Maggie 3.6's around the room trying to get a 'good sound'. Well, as a last ditched attempt, before giving up, I bought a Tact RCS 2.0 - Room correction preamp. They are a steal direct from the m/f at $1500, with a two week return policy, so you have nothing to loose.
It slots easily between your transport and DAC, and setup is a complete breeze, though time consuming. I can't say that I've completely nailed the right tonal balance for me, but I've been able to warm up the sound of the 3.6's, roll off a little treble harshness, extend the bass a little and remove soom of the peaks and troughs on the frequency repsonse curve in my room. Bass is now consistent, midrange is warmer, there is no loss of detail that I can detect, and I'm a lot happier about the system.
The only downside is that it is a bit tweaky, you find yourself switching in different frequency repsonse curves to suit a particular CD's tonal balance, so it is a little distracting at times. However, I think this 'tweak factor' is probably just 'newness' and that the novelty will wear off and I can get back to enjoying music.
Highly recommended component in my humble opinion.
