Milpai, the amps my dealer often uses with 48R's are the VTL tube stereo power amps. But they are pricey and on this occasion he used a
Prima Luna Dialogue HP power amp fitted with KT88 tubes. Surprisingly perhaps, the bottom end was fine, with pretty good control. So a good value combo. To my ear, the bass end on these speakers goes surprisingly deep given their exterior dimensions. Certainly, it is significantly more extended and morre tuneful than the Sonus Faber Cremona M's I used to own.