Specifications From Ampeg.com RMS Power Output: 350-Watts with Internal Speakers RMS Power Output: 500-Watts with Extension Speakers LF Driver: 2 x 10" Speakers HF Driver: 1" Compression Driver with Level Preamp: Solid-State Power Amp: Solid-State Tone Controls: 3-Band EQ Mid Tone Control: Ultra Mid Balanced Line Out: Yes, Pre/Post Send, -20dB Pad Preamp Out/Power Amp In: Yes Effects Loop: Yes Dimensions (W x H x D inches): 24 x 23.5 x 17.25 Weight: 86 Pounds

I bought this amp used and so far I really dig it. My thought was that it would be nice to have one unit that I could use for smaller gigs and add a cab for larger gigs.  That's exactly what this provides and I like both the tone and power...especially with the extension cab. This thing is a beast...that is what I call it..."The Beast."  It is the heaviest 86 pounds I've ever lifted.  No pain, no gain!