"Available in either a 100-watt 1x12 or the 200-watt 2x12 shown here, Roland's new GA series is the company's most straightforward implementation of its COSM architecture ever. They offer four channels, each with bass, mid, treble, presence, and reverb knobs, as well as a Progressive Amp section that imparts an impressive range of very dynamic and tube-like tones. rolandus.com"