NEVER STOP INNOVATING ATTITUDE - DS18 stands out from other brands with our progressive designs and unwavering commitment to delivering the most technologically up-to-date products on the market. ADJUSTABLE FREQUENCY - The knob for frequency adjustment will help you attenuate your bass with a quick turn of the dial to tune in your bass volume with every song you play. PERFECT POWER - The ZR800.4D is made to deliver 2 x 600 watts RMS @ 4-Ohms Bridge, 4 x 320 watts RMS @ 2-Ohms, and 4 x 200 watts RMS @ 4-Ohms giving you the perfect power for your bass and speakers. MAXIMUM POTENCIAL - The ZR series was designed to pump up the bass and help your speakers reach their maximum potential as a part of your sound system. SUPERCHARGE - DS18’s ZR series of amplifiers are guaranteed to supercharge your sound system to deliver brilliant sound and bulky bass frequencies.