A used Euphonice Audio iAMP Pro bass head. This 1200-watt lightweight head was designed to provide as much power as you would ever need with stuidio-level fidelity and flexibility. This example is in great shape, save for some minor rack rash. It has been cleaned and tested. It is fully functional and sounds fantastic.
From Euphonic Audio...
Powerful singers through more powerful PA systems. Heavy handed (and footed) drummers. Guitarists with 5' stacks. Your keyboardist? That goes without saying. There are bands that play at concert volumes, even if the concert is a practice room. That's why we make the Pro. It gives you EA's sonic accuracy with enough juice on tap that we could have rated it in horsepower.
The Pro is more than just high fidelity and higher power. It's got the studio-grade, semi-parametric preamplifier that's toured the world with the world's best. The beauty of this control machine is that you can run it flat for super-natural sound, choose any of four precise presets for a quick on-the-fly fix, or delve into the EQ for surgically-precise, frequency tuning that can bring out your soloing tones, or help tame a nasty room. But that's only half the story - these presets and EQ points were dialed-in by performing bassists so every one of the settings makes musical sense.
-Power Output: 1200 Watts @ 4 Ohms
-Controls: Master 1, Master 2, Treble, Middle, Bass, Volume, Gain, Gain
-Dimensions: 14" x 9" x 3.5"
-Weight: 9 lbs
4-band EQ with boost/cut and variable frequency controls
-Effects Loop: Series Post EQ with independent level control
-1/8" stereo mini-jack and volume control for audio mixing