Audioengine HD4 Bluetooth Speaker System (Walnut, Pair)

BH #AUHD4WAL • MFR #HD4-WAL
Audioengine HD4 Bluetooth Speaker System (Walnut, Pair)
Key Features
  • 60W Total RMS / 120W Total Peak Power
  • Bluetooth aptX HD Audio Streaming
  • 4" Woofer & 0.75" Tweeter per Speaker
  • Stereo RCA, 3.5mm, Micro-USB Inputs
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.
In Stock
$449.00
$75/mo. suggested payments for 6 Mos.
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Audioengine HD4 Overview

  • 1Description
  • 2Cabinets
  • 3Furniture-Grade Finishes
  • 4Custom Components
  • 5Based on Studio Monitor Designs
  • 6High-Quality Bluetooth Audio
  • 7HD3 Headphone Amplifier
  • 8Amplifier Design
  • 9Driver Designs
  • 10Shielding
  • 11Headphone Amp
  • 12Additional Features
  • 13Efficient Integrated Design

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.

Cabinets

To minimize unwanted resonances and distortion, Audioengine cabinets have thick high-resin MDF walls with extensive internal bracing. Heavy internal sound-damping material is used to reduce unwanted sound reflections inside the cabinet. All cabinet edges are rounded which look great and reduce high-frequency diffraction effects on the front baffles. The P4 cabinet contains tuned, front-port slots.

Furniture-Grade Finishes

The HD4 cabinets are available in several handsome finishes, including walnut veneers as well as satin black paint, offering options for complementing room furnishings. Also included are detachable grilles that add further aesthetic advantages as they are firmly held in place with hidden neodymium magnets for a clean look.

Custom Components

Audioengine designs and manufactures their own tweeters, woofers, and other critical components. In other words, these are not box-built speakers with off-the-shelf parts, but custom-designed to Audioengine's specifications. What they do not fabricate directly in their factory, they have made to their designs (parts such as transformers, magnets, and wiring harnesses, for example). The cabinets, drivers, bass port designs, amplifiers, and crossovers are all painstakingly tuned together for each Audioengine model. This, in turn, makes for a much more efficient system that requires much less power than passive speakers and a separate integrated amplifier or similar A/V components.

Based on Studio Monitor Designs

Studio monitor speakers are used by producers and engineers in recording and production studios. They are designed with a theoretical flat frequency response which allows the engineer to create a final mix in such a way that the recorded music will sound good on most other speakers. Although Audioengine speakers are not designed to be up-close "nearfield" studio monitors, they carry over much of the same higher-end technology, components, and design philosophy for all Audioengine speaker systems.

High-Quality Bluetooth Audio

The Bluetooth built into the HD4 powered speakers features aptX HD coding, which is an advanced Bluetooth audio codec with very impressive sound. And even if your phone or tablet does not have aptX HD, the HD4 Bluetooth solution is backwards-compatible with SBC and AAC codecs, as well as standard aptX, so you can wirelessly stream music from any Bluetooth-enabled device and still enjoy all your music. High-fidelity Bluetooth aptX HD that really works and sounds great. Here is why:
  • Extended-range wireless: Most Bluetooth implementations have very limited range, typically within just one room. But with careful signal management circuitry and antenna tuning, we offer a superior solution that has up to 3 times the range of standard Bluetooth for multi-room use, with no degradation in audio quality.
  • 24-bit DAC: The HD4 Bluetooth receiver and USB input both utilize the PCM 5102 DAC, widely known for its low noise and high fidelity. The PCM 5102 is used as an upsampling DAC and will pad all bit depths to 24-bit, achieving a higher signal-to-noise ratio and lower noise floor. Due to the high signal-to-noise specs of the PCM 5102, the fact that digital signal is upsampled to 24-bit as well as the added benefit of onboard triple redundancy power source conversion and filtering the HD4 Bluetooth implementation presents impressive low noise and low distortion characteristics with a noticeable improvement over other Bluetooth devices.

HD3 Headphone Amplifier

The HD4 contains a high-performance headphone amplifier based on the OPA2134 low-noise opamp. This amp is able to provide low-impedance, high-fidelity audio, and a 2-volt output which easily drives a wide range of headphones.

Amplifier Design

The amplifiers in powered Audioengine speakers are located in the left speaker and are a conservatively rated class A/B analog monoblock design. This is a more traditional speaker/amplifier configuration which provides excellent quality audio and greater flexibility. All circuit boards for the power and preamp sections are vertically mounted for maximum mechanical shock protection.

Driver Designs

Audioengine uses audiophile-quality, ferrofluid-cooled silk dome tweeters with neodymium magnets. Silk tweeters hold up well under high power and the edge-driven design gives very smooth response. The woofers are aramid fiber woven glass composite with rubber surrounds. Aramid fiber is obviously very strong, which means the woofer retains its shape when being driven at high levels.

Shielding

Both drivers are directly video shielded and allow the user to place the speakers within a few inches of a video monitor. This shielding also offers protection for hard-drive digital music players.

Headphone Amp

  • 2 VRMS full-scale headphone output level
  • 2 ohm output impedance
  • 10 ohm to 10 kilohm recommended headphone impedance level

Additional Features

  • <50 dB crosstalk
  • Output current limiting, thermal over-temperature, and power on/off transient protection
  • Input data rate determined by Bluetooth
  • ~30 ms wireless latency
  • Micro-USB 1.1 input
  • 0.7" thick MDF cabinets with real wood veneer
  • Tweeters with neodymium magnets
  • Aramid fiber woofers with advanced voice coils

Efficient Integrated Design

The speaker cabinets, drivers, innovative bass port designs, amplifiers, and passive crossovers are all critically tuned together for each Audioengine model. This, in turn, makes for a much more efficient system that requires less power than passive speakers and a separate integrated amplifier or similar A/V components. They build all this goodness into the left speaker cabinet to make it super-easy to connect your smartphone, tablet, computer, TV, network player, or any other audio product.
UPC: 852225007193

Audioengine HD4 Specs

Speaker System
Speaker Configuration2-Way
Amplifier Power Rating60 W RMS
120 W Peak
Drivers1 x 4" / 101.6 mm Woofer (per Speaker)
1 x 0.75" / 19.05 mm Silk Dome Tweeter (per Speaker)
Enclosure TypeBass-Reflex
Ports1 x Front-Firing (per Speaker)
Frequency Response60 Hz to 22 kHz (±1.5 dB)
Magnetic ShieldingYes
Wired ConnectivityActive, 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)
Amplifier Class2 x Class-AB
SNR (Signal-to-Noise Ratio)95 dBA
THD (Total Harmonic Distortion)< 0.05%
Input Impedance5 Kilohms
Wireless Connectivity
Wireless Connection ProtocolsBluetooth
Bluetooth5.0
Wireless Range100' / 30.5 m
Supported Audio CodecsAAC, SBC, aptX, aptX HD, aptX LL
Power
AC Input Power110 to 240 VAC, 50 / 60 Hz
Power Consumption10 W (Standby)
Compatibility
Supported Sample RatesUp to 44.1 kHz
Up to 48 kHz
Physical
Placement & Mounting OptionsTabletop/Bookshelf
Cabinet MaterialMDF
Operating Temperature32 to 95°F / 0 to 35°C
Storage Temperature-4 to 113°F / -20 to 45°C
Operating Humidity5 to 95%
Dimensions5.5 x 6.5 x 9" / 14 x 16.5 x 22.9 cm (Each)
WeightActive, Left:
7.2 lb / 3.3 kg
Passive, Right:
5.4 lb / 2.4 kg
Packaging Info
Package Weight15.84 lb
Box Dimensions (LxWxH)14.8 x 12.7 x 9.7"

Audioengine HD4 Reviews

Good Quality Speakers

By George
Rated 4 out of 5
Date: 2022-01-17

Great speakers! The speakers were a Christmas gift. I like the color and size of the speakers. I use the speakers with my computer and the sound is a very good quality. Good product.

There's a lot going on in these speakers

By Lee
Rated 5 out of 5
Date: 2021-11-17

Very pleased. Good sound, good power, the bluetooth feature is fun so I can listen to music on my phone. Instruments sound good, voice sounds good, I would describe the sound as tight. It lacks bottom end, but that's to be expected from such a small speaker. The packaging was excellent, and they look great! I highly recommend them. I think they are an excellent value, all things considered.

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Though they are bluetooth, do the speakers need ...

Though they are bluetooth, do the speakers need to be wired together?
Asked by: joseph
Yes, only one of the speakers is powered and connects to AC power. The second speaker connects to the powered speaker via standard speaker cable (2m/6.5' cable included).
Answered by: Frank
Date published: 2021-02-23

Do I need to buy a DAC to use these speakers with ...

Do I need to buy a DAC to use these speakers with my computer?
Asked by: Lee
No
Answered by: David
Date published: 2021-10-31

Can a sub woofer be hooked to these speakers?

Can a sub woofer be hooked to these speakers?
Asked by: Douglas
The Audioengine HD4 includes a variable full-range preamp audio output so you can connect a subwoofer or another music sytem.
Answered by: David
Date published: 2022-01-03
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