Rnik,
I currently use Nuforce Ref9 amps. Previously I had expreience with the Ear 501 MKII and Mark Levinson 331/333, Pass Labs X250/X350 traditional amplifiers and some other more. My speakers are Thiel CS6, which represent a pretty difficult load and rather hard to drive corretly. My room is treated with bass traps in the corners, diffusers and absorbers in the appropriate places (built and designed by an acoustic engineer). To cut the long story short my expreience is that the EAR and especially the Nuforce amps offer tremendous control, their damping factor is 4000, they are extremely fast and their musical presentation is different than that of their traditional counterparts. I mean that because of true control, bass is not boomy anymore but dry and fast. I am a bass player and while I was burning in the amps and the power cords I was missing a bit of that beefier bass sound but after burn in was finished I realized that I have the most dry articulate and true bass reproduction I could have ever asked for. I felt that even without the tube traps music was enjoyable.
I am not saying that these little "ashtray" amps are better than a Pass X350 or Levinson No 333 for example but what I am saying that they are equally good. In terms of speed and control they are even better. Their midrange is not tubelike in my opinion, although some reviews suggest that, but they are very true sounding instead.
I know that the Andra is a great speaker and I think that we do not need more bass than enough. It is better to get used to music reproduction which is closer to the truth than to look for artificial colorations by cables or other stuff. Of course, we all have to decide for ourselves which is coloration, what is right for us. Maybe you will be happy if you find a cable with a litter weightier bass...
The most important factor though IMO is the room itself, speaker placement and finding the right listening position.
Enjoy the tunes!