Sound Devices HX-3 Headphone Amp

Sound Devices HX-3 Headphone Amp
 Sound Devices HX-3 Headphone AmpSound Devices HX-3 Headphone Amp 

Sound Devices HX-3 Headphone Amp

The compact HX-3 Headphone Distribution Amplifier is the perfect accessory to quickly provide three high-performance stereo headphone feeds with individual level controls from line-level sources. The HX-3 can produce very high headphone levels with extremely low noise and distortion.

Great for radio, television, film, and music production applications, the battery-powered HX-3 accepts balanced XLR line-level inputs or unbalanced 1/4-inch and 1/8-inch stereo inputs. Its 1/4-inch loop-out can connect multiple HX-3's for additional headphone outputs. Headphones are connected to panel-mounted 1/4-inch stereo connectors.

The HX-3 has a durable aluminum chassis to withstand the punishment of field and studio environments. The unit is powered by inexpensive batteries (two-AA) or external 5-18 VDC.

The HX-3 can add headphone outputs to the 552, 302, MixPre-D, MM-1, and USBPre-2.

Key Features

  • Three isolated headphone outputs with individual volume controls.
  • 125 dB dynamic range with flat frequency response.
  • Durable 1/4-inch connectors, panel mounted for strength.
  • Stereo or mono monitoring.
  • Peak LED indicates headphone overload.
  • Two balanced XLR line level inputs or unbalanced 1/4-inch and 1/8-inch stereo inputs.
  • Loop Output to connect additional HX-3's in series.
  • All-metal connectors solidly mounted to the chassis for durability and RF immunity.
  • Free from "Pin-1" grounding problems.
  • Internal battery-power for up to 18 hours from two AA alkaline batteries.
  • Chassis-isolated 5 to 18 VDC input for easy external DC powering.
  • Power LED indicates low battery power.
  • High strength, extruded aluminum chassis with protective metal end panels.

Panel Descriptions

Front Panel

  • Headphone level control for each output (x3)
  • Peak indicator for each headphone output
  • Stereo/Mono selection switch
  • Power LED indicates green when powered, red when batteries are low
  • Power switch selects powering source

Input Panel

  • Balanced, stereo, line-level input on XLR
  • Unbalanced TRS stereo input on 1/4-inch connector
  • Unbalanced TRS stereo input on 1/8-inch connector
  • Loop output on 1/4-inch to link additional HX-3s

Output Panel

  • 1/4-inch TRS stereo headphone outputs (x3)
  • 1/8-inch TRS stereo headphone output
  • Battery tube (2 x AA)
  • DC input, 5 - 18 VDC


Frequency Response 10 Hz - 50 kHz, -±1.0 dB, any input to any output, gain controls set to 50%
Voltage Gain 34 dB from balanced line to headphone output, 35 dB from headphone input to headphone output
Output Clipping Level +18 dBu minimum with 600 ohm load, +16 dBu minimum with 300 ohm load
Headphone Output Impedance 200 ohms
Input Clipping Level XLR: +24 dBu minimum
1/4-inch and 1/8-inch inputs: +22 dBu minimum
Dynamic Range (balanced line inputs) 120 dB minimum
THD + Noise 0.03% maximum (from 10 Hz to 22 kHz @ +10 dBu input and output level, 300 ohm load, 10 Hz - 22 kHz filter bandwidth)
Inputs XLR: electronically balanced, 22k ohm input impedance, 1/4-inch unbalanced: 9.1k ohm impedance
1/8-inch unbalanced: 9.1k ohm impedance.
Internal Voltage Rails ±15 V, regulated
Power Source Internal: 2 AA alkaline batteries, 18 hours life typical with nominal levels. External: 5 - 17 VDC via threaded coaxial connector (5.5 mm outer diameter, 2.1 mm inner diameter), pin positive, sleeve negative.
Power LED Green indicates power and good battery. Red indicates power with low batteries. LED turns red when ~ 4 hours of battery life remain.
Operating Temperature Range 0 to 70 degrees C
32 to 160 degrees F
Dimensions 43 mm x 94 mm x 140 mm (h x w x d) (1.7" x 3.7" x 5.5")
Weight (unit only) 0.56 kg
1.24 lbs
Included Accessories 1/4-inch to 1/8-inch trs interconnect cable, rubber feet (4), locking DC jack

Delivery Services

At Pinknoise Systems we like to offer our customers a wide choice of delivery options for their orders, and our prices are affordable and competitive. We also use only the best, most reliable couriers and delivery services to get your equipment where it needs to be - quickly and securely. Please find an outline of our services, prices and timescales below.

Service Timescale Price
UK Mainland Royal Mail Small Parcel 2-4 Days £3.99
UK Offshore Royal Mail 2-4 Days £9.99
UK Standard Courier 2-4 Days £6.49
UK Express Courier Next Day £7.99
International Shipping From 1-8 Days (Full Details) From £15.00

Delivery Times

Delivery times are based on when the packages leaves our premises. Sometimes, due to stock restrictions or a non completed order, delivery may take longer as there is a delay with dispatch. We will always notify customers of any issues and problems via email or telephone. If your order is urgent or details change please do let us know.

For full details, fees, and time schedules, please see our Delivery Information page.

Returns & Refunds

New items: You can return goods you have ordered from us for any reason, at any time within 7 working days of receipt, for a full refund or for an exchange for a different product from our range. The cost of returning goods to us shall be borne by you, the customer, in all circumstances without exception.

Items must be packed suitably and insured for full loss in the event of a delivery problem. Pinknoise Systems will not be responsible for lost or damaged return goods. Lost or damaged goods may effect the level of refund you receive.

Used items: Please note this does not apply to used item unless they are deemed faulty.

For full details of our returns policy, please click here.

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£480.00 £510.00
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Delivery hours
UK ORDERS: Order soon for delivery on using our express service

Model:  SD-HX3
Part No.:  HX-3
Manufacturer:  Sound Devices

Sound Devices
Contact us for advice

Need advice? Give us a call

(+44) 01453
825 802

International Delivery

International delivery

We ship across Europe and around the world and have a multitude of shipping options available to our international customers during the checkout, including express delivery for urgent orders.


We have a next day shipping option available for the UK with our DPD courier service, which features delivery alerts, personal delivery preferences and driver tracking with the DPD mobile app.


Spread the cost to maximise your capital. Just call our helpful sales team on 01453 825 802, from 9.30am - 5.30pm, to discuss these options and find out what's available to you.

We accept PayPal, Visa, Mastercard, Maestro, American Express

Sound Devices HX-3 Headphone Amp

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