I wouldn't. I looked into these a couple of years ago and concluded that they probably won't give any noticeable warmth or accuracy. You are way better off using warm tweeters like the A/D/S silk units, a good Class A/B amp, and a good 10+ band equalizer to remove any harshness like the AudioControl EQL that can act as a line driver too. Then buy a seperate x-over like the Soundstream SVX2. It would be a good idea to prepare/deaden/seal your doors correctly and have your sub box built by a pro too - done right that can add alot of warmth too - and get a Bass cube for added control over and fine tuning the warmth of that sub instead of spending anything on a tube preamp. Further, I've run some pretty high end tube preamp stuff on my home system and to be honest they didn't sound warm, just really accurate - and that's because alot of the warmth comes from having a tubed output stage, not preamp - and that Soundstream is just a preamp with tubes mixed in with alot of solid state anyway.