Audioengine A5+ Powered Speaker & S8 Subwoofer Bundle - Black This bundle includes 2 items from Audioengine: (1) Pair of A5+ Powered Speakers & (1) S8 Subwoofer Built-in power amplifiers, 50 watt per channel RMS Compatible with any computer (Mac or PC) Custom Kevlar woofers and silk tweeters 8-inch powered down firing subwoofer with Dual line-level inputs (RCA and mini-jack) and LFE