It puts out 575 per side. I used it with an Ampeg 6x10 (600 watts @ 4 ohms). It worked really well with that cab. My understanding is that I could have ran two 610's and had each running at 575 watts. This is because each channel is completely separate of one another.
I hope this helps:
The ABM 900 EVO II is a 2 x 575W RMS bass amp head designed to satisfy both bass purists and tech-heads alike. 3 rotary tone controls provide 20dB of cut and boost at 60Hz, 660Hz and 5kHz and are supplemented by 2 pairs of additional sliders giving 15dB cut and boost at 180Hz, 340Hz, 1.3kHz, and 2.6kHz. The EQ can be switched on/off and flat/shaped by footswitch, enabling you to go from a flat fretless sound to a boosted sound with ease. The single input is switchable for passive and active instruments. A blend of solid state and dual-triode tube preamp stages can be preset and selected by footswitch, providing access to a massive range of clean, warm, and overdriven tones.
The footswitchable subharmonic generator precisely tracks the main signal and reproduces it an octave lower. A subharmonic level control lets you add just the right amount of low-end reinforcement--everything from a subtle thickening of the sound to unbridled, bone-crushing tone.
The ABM 900 EVO II also features a front panel-mounted balanced direct out with pre- or post-EQ switching, a sub-bass output, tuner output, FX loop, and a line input for connecting an external sampler or sound source. Output muting cuts the signal from the direct out but leaves the tuner output live, allowing silent tuning. The upgraded power section has faster transient attack, more headroom, and even less noise.
2 x 575W RMS
Switchable active/passive input
Tube/solid state preamp stages
Sub-harmonic generator adds low-end reinforcement
Front-mounted direct output with pre- and post-EQ switching