USA 
HD4 Bluetooth Speaker System (Walnut, Pair)
Product Description
Designed to connect to virtually any device, the walnut Audioengine HD4 Bluetooth Speaker System provides a 3.5mm input, a stereo RCA input, a micro-USB input, and Bluetooth connectivity with aptX HD support, which allows for wireless connectivity with your compatible devices. Each speaker consists of a 4" woofer and a 0.75" tweeter and output up to 30W per channel RMS, or 60W per channel peak for room-filling sound. For your convenience, all connectivity is via the powered left speaker, which connects to the passive right speaker with speaker wire.
| Disc Player | |
| Compatible Disc Media | |
| Disc Capacity | |
| Radio Tuner | |
| AM/FM Presets | |
| Tuner Range | |
| Clock | |
| Party Features | |
| Wired Connectivity | |
| Speaker System | |
| Channel Configuration | |
| Speaker Configuration | 2-Way |
| Power Handling | |
| Recommended Amplifier Power | |
| Bi-Amp Capability | |
| Amplifier Power Rating | 60 W RMS 120 W Peak |
| Drivers | 1 x 4" / 101.6 mm Woofer (per Speaker) 1 x 0.75" / 19.05 mm Silk Dome Tweeter (per Speaker) |
| Passive Radiators | |
| Enclosure Type | Bass-Reflex |
| Ports | 1 x Front-Firing (per Speaker) |
| Frequency Response | 60 Hz to 22 kHz (±1.5 dB) |
| Frequency Range | |
| Impedance | |
| Magnetic Shielding | Yes |
| Wired Connectivity | Active, Left: 1 x Stereo RCA Input 1 x Stereo RCA Output 1 x 1/8" / 3.5 mm Input (Audio) 1 x Micro-USB Input (Audio) 1 x Binding Post Pair Output (to Other Speaker) Active, Right: 1 x Binding Post Pair Input (from Other Speaker) |
| Media Card Slots | |
| Maximum Wire Gauge | |
| Amplifier Class | 2 x Class-AB |
| Constant Voltage / Transformer Taps | |
| Crossover | |
| SPL | |
| Sensitivity | |
| SNR (Signal-to-Noise Ratio) | 95 dBA |
| THD (Total Harmonic Distortion) | < 0.05% |
| Input Impedance | 5 Kilohms |
| Input Sensitivity | |
| Controls | |
| Subwoofer Type | |
| Enclosure Type | |
| Power Handling | |
| Recommended Amplifier Power | |
| Amplifier Power Rating | |
| Drivers | |
| Magnet | |
| Voice Coil | |
| Passive Radiators | |
| Ports | |
| Frequency Response | |
| Frequency Range | |
| Amplifier Class | |
| Impedance | |
| Magnetic Shielding | |
| Connectivity | |
| Crossover Frequency | |
| Maximum SPL | |
| Sensitivity | |
| Input Impedance | |
| Input Sensitivity | |
| SNR (Signal-to-Noise Ratio) | |
| Total Harmonic Distortion (THD) | |
| Phase Adjustment | |
| Wireless Connectivity | |
| Wireless Connection Protocols | Bluetooth |
| Wi-Fi Bands | |
| Wi-Fi Standards | |
| NFC | |
| Bluetooth | 5.0 |
| Multipoint Support | |
| Maximum Paired Devices | |
| Wireless Range | 100' / 30.5 m |
| Bluetooth Profiles | |
| Supported Audio Codecs | AAC, SBC, aptX, aptX HD, aptX LL |
| Power | |
| AC Input Power | 110 to 240 VAC, 50 / 60 Hz |
| DC Input Power | |
| Power Consumption | 10 W (Standby) |
| Battery Type | |
| Internal Battery Capacity | |
| Expected Battery Life | |
| Battery Charging Time | |
| Compatibility | |
| Supported File Formats | |
| Supported Sample Rates | Up to 44.1 kHz Up to 48 kHz |
| OS Compatibility | |
| Processor Requirement | |
| RAM Requirements | |
| Storage Requirements | |
| Required Hardware | |
| Physical | |
| IP Rating | |
| Placement & Mounting Options | Tabletop/Bookshelf |
| Floor Contacts | |
| Cabinet Material | MDF |
| Grille | |
| Cable Length | |
| Operating Temperature | 32 to 95°F / 0 to 35°C |
| Storage Temperature | -4 to 113°F / -20 to 45°C |
| Operating Humidity | 5 to 95% |
| Dimensions | 5.5 x 6.5 x 9" / 14 x 16.5 x 22.9 cm (Each) |
| Weight | Active, Left: 7.2 lb / 3.3 kg Passive, Right: 5.4 lb / 2.4 kg |
| Warranty Length | Limited 3-Year Warranty |