xennon between 1 and 4 ohms 600wrms i have had it for about 6 months very nice amp no trouble low drain on my standard electrical system(minimal almost non exhistant dimming at high volumes at night) never shuts off love it! great sound plays low/clean.with a sound stream exact 10 .....or 2? (tried / used 1 and 2 woofers,prefer the sq of just 1,but am going to UPGRADE WWWWHHHHHHHHEEEEEEEEEEEEEEEEEEEEEEEE to an rl-p 12 as soon as i can get mikey to bill me n ship it!)