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Audioengine HD4 Wireless Bookshelf Speakers with Bluetooth & Headphone Amp

Audioengine  |  SKU: HD4-BLK
Colour: Black

Includes 3 Years Warranty + 60 Day Returns

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Need some advice? Call our audio experts on 02393 190955, live chat or email us and we’ll help you make the best decision. Learn More

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Extended 60 Day Returns

We’re so confident that you’ll be happy with your purchase that we’ve extended our returns policy to 60 days. We call it the “Happy Sound Guarantee”.

If you’re not happy with your purchase for any reason simply send it back to us for a full refund. Learn More


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 input from your computer, Bluetooth aptX-HD from your phone, tablet or computer, or good old analog from that turntable or prized tape deck.

The HD4 system also features a high-quality headphone amplifier for private listening.

Bringing home the high-performance technology inside our HD6 along with the convenience of our modestly-sized HD3, the HD4 is a perfect blend of the power you love to feel and the modern functionality you depend on.


  • SIZE-DEFYING SOUND: The HD4 is the perfect upgrade where surfaces are minimal but performance and convenience can’t be compromised. As handsome as they are compact, the HD4 will easily fit in any small living space and blend in with any decor

  • YOUR MUSIC, YOUR WAY:  Featuring Bluetooth aptX-HD for premium, extended-range wireless that allows for quick and easy connection to stream your existing music services, tune into your favorite podcast or listen to those carefully curated playlists from your personal music library

  • EASY SETUP:  Simply place the speakers where you want them and connect the power supply. Connect the powered left speaker to the right passive speaker. Then connect your music with the supplied cables - or go wireless - and that's it.  No network setup, no passwords, no hassle

  • HEADPHONE AMP: The HD4 contains a high-performance headphone amplifier. This amp is able to provide low-impedance, high-fidelity audio and a 2-volt output which easily drives a wide range of headphones.

Key Features

  • Zones
    Single Zone
  • Placement
    Freestanding, Bookshelf
  • Music Sources
  • Inputs
    3.5mm AUX, RCA
  • Outputs
    Subwoofer Out, RCA Line Out
  • Power Handling
    120 Ws
  • Driver Size
  • Sensitivity
    60 Hz - 22 kHz
  • Dimensions
    230 x 140 x 165 mm (HxWxD)
  • Warranty
    3 Years


    • Type: Powered Bluetooth aptX HD speaker system
    • Amplifier Type: Class AB
    • Power Output: 120 W peak power total (30 W RMS / 60 W peak per channel), AES
    • Drivers: 4″ aramid fiber woofers/ 0.75″ silk dome tweeters
    • Inputs: 3.5 mm stereo mini-jack, USB, RCA L/R, Bluetooth
    • Outputs: RCA variable line-out, 3.5 mm mini-jack headphone out
    • Input Voltages: 110-240 V 50/60 Hz auto-switching
    • SNR: >95 dB (typical A-weighted)
    • THD+N: <0.05% at all power settings Crosstalk/ <50 dBFrequency Response/ 60 Hz-22 kHz ±1.5 dB
    • Input Impedence: 5K ohms unbalanced
    • Protection: Output current limiting, thermal over-temperature, power on/off transient protection
    • Power Consumption: Idle 10W
    • Bluetooth Receiver Type: Bluetooth 5.0/ aptX HD, aptX, AAC, SBC
    • Wireless Operation Range: Up to 100 ft (30 m) typical
    • USB Device Class: USB 1.1 or above
    • Headphone Amp Type: OPA2134
    • Full-scale Headphone Output Level: 2.0 V RMS
    • Output Impedence: 2 ohms
    • Recommended Headphone Impedence Level: 10 ohms to 10K ohms
    • Dimensions (HWD): Each speaker – 9″(23 cm) x 5.5″ (14 cm) x 6.5″ (16.5 cm)
    • Weight: Left (active) – 7 lb (3.2 kg)/ Right (passive) – 5.2 lb (2.4 kg)

What's In The Box

    • 1 x HD4 Active Speaker Left
    • 1 x HD4 Passive Speaker Right
    • 1 x Antenna
    • 1 x Speaker Cable 2m (6.5ft)
    • 1 x AC Power Cord 1.8m (5.9ft)
    • 1 x USB Cable 1.5m (4.9ft)
    • 1 x Mini-Jack Audio Cable 2m (6.5ft)
    • 1 x RCA Audio Cable 2m (6.5ft)
    • 1 x Setup Guide

Payment & Security

Secure Payments

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Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Authorised Dealer

K&B Audio are authorised dealers for Audioengine. All sales come with a 3 Years manufacturers warranty and full technical support.

Audioengine HD4 Wireless Bookshelf Speakers with Bluetooth & Headphone Amp - K&B Audio

Audioengine HD4 Wireless Bookshelf Speakers with Bluetooth & Headphone Amp










Drive Type




Noise Cancelling



Single Zone

Music Sources



3.5mm AUX, RCA


Subwoofer Out, RCA Line Out

TV Connection


Smart Features


Cut-Out Diameter


Mounting Depth


Power Handling

120 Ws



Driver Size



60 Hz - 22 kHz

Frequency Response



230 x 140 x 165 mm (HxWxD)


3 Years
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