Audioengine HD6 Powered Speakers - Satin Black - Built-in analog class A/B monoblock power amplifiers - Dual audio inputs and full-range variable output - High-fidelity advanced Bluetooth® with aptX®, simplified setup, extended range, and 24-bit upsampling - 24-bit digital optical (SPDIF) input - Custom 5.5" Kevlar woofers with die cast aluminum woofer baskets - Custom 1" silk tweeters with neodymium magnets and ferrofluid-cooled voice coils - 150W peak power total (50W RMS/75W peak per channel)