Watch the Review … Riot MODEL 400W High Output 4 Channel Full Range, Class A/B Amplifier Dim:7.75"L 9"W 2"H. MODEL 400W High Output 4 Channel Amplifier Up to 75 W X 4 RMS @ 2 ohm Up to 38 W X 4 RMS @ 4 ohm; … Boss R1004 • 400W Riot Series 4-Channel Class A/B Car Amplifier • RMS: 38W x 4 @ 4 ohms • Peak: 100W x 4 @ 2 ohms • Total Peak Power: 400W • Frequency response: 12 - 22000 Hz • Dimensions: 9"W … ... 400 Watts x 2. Boss’ Acoustic Singer Live is a smart modern acoustic amp with intuitive controls that enable a wide range of sound-reinforcement and tone-shaping possibilities. Blue Backlit Illuminated BOSS Logo; Dimensions: 10.72" L x 10.44" W x 2.25" H $ 75.99. Peak Power @ 4 Ω ... Lots of people trash on these amps in the reviews here, but the R6002 1200W amp … It’s rugged, gig-ready, and a real boon for the performing singer-songwriter who can’t afford to break the bank.