📌LAB POINTS mid-sized design with extra-loud output, 120W peak power powered speakers w/ built-in amplifier & dedicated headphone amp + subwoofer output in terms of power + size, sits in between the full-sized HD6 + the compact HD3 4" aramid fiber woofer + 0.75" silk dome tweeters w/ neodymium magnets + advanced voice coils upgraded AptX Adaptive Bluetooth 5.3 with expanded, more stable range & HD capable 24-bit Hi-Res audio upgraded PCM 5102 DAC - high quality digital converter is utilized by both Bluetooth and USB inputs RCA input to connect a turntable (phono preamp required if turntable does not have one built in) USB-C input to connect a computer convenient front-panel headphone jack and volume / power knob removable, magnetic speaker grills 18mm thick MDF cabinets with real wood veneer + furniture-grade finish all necessary cables included improve acoustics with Audioengine DS2 Speaker Stands also available in black "Effortlessly fill any living space with the power of incredible, true stereo sound that brings your listening experience to life. An all-access pass to ALL of your music on any app or device, the HD4 offers wired or wireless connections including USB-C input from your computer, Bluetooth 5.3 aptX-HD from your phone, or good old analog from that vintage turntable or prized tape deck." - Audioengine 🔎KEY FEATURES analog dual-class A/B amplifier 120W peak power total (30W RMS / 60W peak per channel) inputs: 3.5mm mini-jack, RCA L/R, USB-C, AptX Adaptive Bluetooth 5.3 outputs: variable line-out RCA output, stereo mini headphone output, sub out drivers: 4" Kevlar woofers, 3/4" silk dome tweeters freq. response: 60Hz-22kHz ±1.5dB dimensions (each): 9"h x 5.5"w x 6.5"d / 23 x 13.9 x 16.5cm weight: 10 lbs (total) / 4.53 kg +BUNDLE AVAILABLE select a + option and we'll include your choice of Audioengine Subwoofer: the compact S6 or wireless ready S8 📦COMES WITH L+R speakers Bluetooth antenna AC power cord speaker wire, 2m (6.5 ft) Mini-jack audio cable , 2m (6.5 ft) RCA audio cable, 2m (6.5 ft) USB cable, 1.5m (4.9 ft) cloth speaker bags cloth cable bag setup guide