From The H&K website: The ideal combination of massive sound-pressure levels and articulate tone united in a single bass amp? Nothing but a pipe dream? No, it's a tangible reality! What most bassists once could only fantasize about has now arrived, courtesy of the BassBase amps. How do they deliver this unique combination of both tone and power? Quite simply, by means of excellent engineering in the form of an integrated tube preamp, Varimetric EQ, notch filters and the kind of headroom that puts a smile on every serious player's face! BASSBASE 600 Head Tube-Bass-Head, 650 Watt/ 4 Ohm, Dynaclip, -Varimetric- EQ, Notch-Filter, MIDI-Option, 19, 3 HE Less than a year old, paid $1100 + road case, will let go for $750+shipping. Email me for pics!