This is a 200 watt Monster! SWR Workingman 2004 amp has a Passive/active input (high or low sensitivity) depending on what kind of Bass you are using, a balanced D.I. (giving you a nice fat signal great for recording), an effects loop and an active EQ. It has two 1/4 in. speaker outputs out the back, a speaker on/off and a tuner out send jack which are all really convenient. It also has a return jack which is a unique feature allowing you to practice to pre-recorded music: You simply use the return jack and the effects blend control to mix the level of the recorded music with your bass level and the combined signal is heard through your headphones, cabinet or both. SWR amplification is U.S. hand-built and they don't cut corners or use second-rate components/hardware. This amp has lots of headroom and I have never had any trouble driving my Ampeg 610HLF (example: I was jamming with the GAIN set to 3 and MASTER VOL set to 5 or 6!!!) and being plenty loud enough for my singer and drummer and my two guitarsits who each use Marshall half-stacks. Need to sell so email or call James at 801-671-2266 with any questions. Location: Salt Lake City it's NOT ok to contact this poster with services or other commercial interests utah