I used them in my speaker system in between a musical fidelity (A302) and my TACT S2150. They are definitely more neutral (or clinical depending upon your persuasion) than the MF amp. They are very close to the TACT amp (as expected) but the TACT gives better soundstage depth, better imaging and definitely a smoother treble. The differences are really pretty small and may be due to the direct comnnection between my source and the TACT with no preamp connection. The outlaws used the GS-X as a preamp, so not really a slouch. I do use them for some music listening on the HT, but that system is not really resolving enough with the current speakers to make much of a determination.