2 years ago when i had burmester 969 transport,dcs elgar+purcell with aesthetix preamp(amps were komuro,speakers were amatis)i was thinking as TOK20000,i used my system every time with preamp never with elgars volume control and never liked volume control of elgar(it was firts version)good pre-amps is the heart of the system.but now i have CEC tl-omk2 with kondo s ongaku dac connected directly to 2 pair tenor amps with passive volume control on it which drive kharma extended exquisite speakers.
several times i tried very good pre-amps(by-passed volume control of tenor),and every times i prefered without preamp.
my last change now,i m waiting for kondo s new ongaku preamp.
but as many things on audio,passive or active preamps and models are system dependent.
and i think there is just one solution ,is to try...