Imagine achieving large stack like tone and levels, with massive bottom end chunk, with amazing sub-sonic fidelity perfection for drop-tuning, 7-string and baritone guitar players, from a compact combo amp system. never before has this concept been offered to guitar players. adding the sub 1 to almost any existing guitar amp system is as easy as plugging in a few guitar cables. small enough to take up minimal space, yet large enough to fit underneath most combo amps, musicians will be able to upgrade their existing guitar amp systems and achieve substantial increases in tonal fidelity as well as dynamic range with a minimum of fuss. 300 watts rms powered sub-woofer, 1-12" jbl driver, built into a compact enclosure, similar in size to most rivera 1-12â€ extension cabinets. utilizing a extremely efficient power amp circuit with built in electronic crossovers, the patented los lobottom ™ sub 1 can be added to any guitar amp system that has either an effects loop, or an external speaker jack output. if used with an amplifier that has an effects loop, the sub 1 built in effects loop facilities allow seamless effects patching, while providing controls for high-pass filtering for the host guitar amp. additional features include low level input (for connection to effects loop send jacks of host amp), low level output (for connection to effects loop return of host amp), phase switch (for phase matching between host amp and sub 1), sub 1 level control, peak level indicator, high pass filter switch, high level input (for connection of the sub 1 to host guitar amp systems not equipped with effects loops, like vintage amps), and mains power switch.