The room might contribute, but I don't think it is the main issue here. I would probably keep the preamp, sell the rest and build a new system.
I have the Grado that you use. You say that they actually sound more satisfying than your stereo, that means that the stereo is really bad.
Get yourself hi-fi.
I have the Grado that you use. You say that they actually sound more satisfying than your stereo, that means that the stereo is really bad.
Get yourself hi-fi.