Ampeg SVT4 PRO hybrid bass amp Can be used in stereo or mono One of the most popular Ampeg heads out there for the reason that it has all the headrood of it's cousin the SVT CL, with modern tech to add ! Same preamp section as the SVT CL. This amp has the Ampeg tone you want. In perfect working order, just got clean bill of health from the tech... RMS Power Output: 300-Watts x 2/900 (mono-bridged @ 8 Ohms) RMS Power Output: 490-Watts x 2/1200 (mono-bridged @ 4 Ohms) RMS Power Output (2 Ohms): 600-Watts x 2 Preamp: Tubes (3 x 12AX7) Power Amp: Solid State Tone Controls: 3-Band Mid Tone Control: 5-Position Graphic EQ: Yes, 9-Band Ultra Low/High Boosts: Yes Balanced Line Out: Yes x 2 Pre/Post with Level Effects Loop: Yes x 2 Preamp Out/Power Amp In: Yes x 2 Dimensions (W x H x D inches): 19 x 5.6 x 15.5 Weight: 39.5 Pounds Made in USA !!! MSRP was $2,169 $800 shipped !