Hi,
I have a Pair of Ref9SEv3 amps. I am thinking of trying a friend's tube preamp but the preamp manual states that it should not be paired with direct couple amplifiers or there may be a chance the speakers will be damaged. I have another friend with Ref18 amps who is also thinking of trying out the preamp. We are not technically inclined and have no clue whether our nuforce amps are direct coupled or not....or even what direct coupled means. Appreciate any clarification on whether Nuforce/nuprime amps are direct coupled or not. Thanks in advance