Hawg Wired Reference Series Amplifier RS400 Smallest, most powerful amplifier version yet - 4 1/2in.x 4in. x 1.7in. Form factor allows fitment of up to 2 in an FLHT, four in an FLTR 400W version: 200W of continuous power @ 4 ohms and 400W @ 2 ohms High and low level input Regulated Class-D makes efficient power, low heat