The perfect tabletop speaker The Hd4 Wireless Speakers are a compact home music system with high-fidelity stereo sound for smaller spaces. Stream your music in seconds from any app or device via high-definition aptX Hd Bluetooth. The HD4 sits perfectly between their siblings the HD3 and HD6 to complete the award-winning Audioengine HD series. The HD4 offers the perfect upgrade for a desktop turntable or main living room system where space is at a premium but performance cant be sacrificed. Small speakers Big sound The HD4 Wireless Speakers are constructed with custom Audioengine components: Aramid fiber woofers silk tweeters Premium Bluetooth aptX-hd and built-in analog power amps wrapped in precision-tuned hand-built and finished wood-veneer cabinets.