I have 2 4 channel amps and one mono block amp for sale. They are all BNIB. The mono is r ated at 600x1 at 2 or 1 ohm at 11.5v. During a bench test it did 1000w continuously. The 4 channels are rated at 50x4 or 200x2 at 4 ohms at 11.5v and during their bench test averaged 140-150x4 and about 450x2, which makes for an awesome amp for a component set and single sub at a 4 ohm load. All the bench testing was done on the amps in my car. I am asking $540 shipped per amp. When bought they all came with a 3 yr warranty and the owner of Ultra will honor that still.