From the Tech 21 internet site ...
The Power Engine 60 is an all-purpose, multi-function, powered extension cabinet. Packing 60 watts of transparent power, it can be utilized with any direct recording gadget or pre-amp, analog or digital, tube or solid state, in stompbox or rackmount formats. When plugging your favorite gadget into a Power Engine, the tone is untouched. So there's no requirement to labor over readjusting all your parameters that would otherwise be colored by a traditional amp.
This has been outstanding for gigging as it is light-weight and sounds terrific with the Line 6 PodXT and numerous other pedals. I'm selling it only because I do not job anymore and I have a smaller amp that fits my needs. I work in Raleigh so depending on where you are found I am ready to fulfill. Price is company at $200. New it ran about $350 - $400.
Also available to trades, let me understand exactly what you've got.