The input impedence of the amp should be at least 10 times greater than the output impedence of the preamp .
Tube/SS synergy?
I have a new system: Cary 306/200 cdp and Audio Research LS15 pre-amp. BWN802 speakers. Overall good quality, a nice improvement in bass response, sound staging. Can't help wondering how substituting an Audio Research CDP or something else would effect sound. My old system was matching Classe gear and the synergy was quite remarkable. any one care to share their thoughts/experience?