LD Systems HPA 6

19" Headphone Amplifier 6-channel

The LD Systems HPA 1 is a versatile headphone amplifier with high power output for stage, studio and home recording and is the perfect solution for wired in-ear-monitoring.. The compact device in a rugged, ergonomically shaped plastic housing with soft-touch surface and practical belt clip is very extensively equipped.

In addition to locking XLR connectors for the stereo signal L/R input, the HPA 1 has a balanced 3.5 mm stereo jack as AUX input, which can be used in parallel for clicks or playback. It is protected for safe operation against excessive input levels; a hollow pin socket with negative internal contact enables the connection of a network adapter for fixed operation.

A 3.5 mm stereo jack is provided as earphone and headphone output. Volume level and balance can be set with easy-grip knobs, a push-button switches between the summed mono and stereo signals. A full-fledged limiter is integrated for distortion-free playback and as protection against feedback.

The LD Systems HPA 1 has bi-colour LEDs to facilitate the features overview, which displays the response of the limiter during peaks and the battery status. At 165 grams, the headphone amplifier is distinctly light-weight and can be operated for up to 12 hours thanks to a high quality 9 V block battery.



  • LDHPA6 6-Channel Rackmount Headphone AmplifierThe LD Systems HPA 6 is a highly flexible 1U 19“ rack format headphone amplifier with 6 fully independent channels and comprehensive features for a wide range of professional audio monitoring applications.

    Each channel provides a 6.3 mm TRS headphone output on the front panel with level control, mono/stereo switching, discrete left/right muting and a 6.3 mm TRS Aux input with Main/Aux balance control for mixing in further signal sources. Four-segment LED meters permit visual output level monitoring, and two 6.3 mm TRS outputs per channel on the rear allow for connecting a total of 18 headphones.

    The HPA 6’s main section features a master level control with eight-segment LED metering and 6.3 mm TRS input to mix in an additional source with all channels. The rear panel provides the main stereo inputs on balanced XLR and 6.3 mm TRS connectors and stereo outputs for daisy chaining multiple units.

Additional information

Product Type

Headphone Amp:


8 (1 Main Input (Stereo), 1 Direct In (Stereo), 6 Aux In (Stereo))

Input Connectors

6.3 mm TRS , XLR

Input Impedance

13 k Ohm(s)

Line Outputs

Main Output (stereo, balanced)

Line Output Connectors

6.3 mm jack , XLR

Power Output

6 x 125 mW


6 x Headphone Level , 6 x Input Mix Main/Aux , 6 x Mono Switch , 6 x Mute L&R , Main Input Level , Power


6 x channel level meter (4-segment LED chain) , 6 x mono LED , 6 x Mute L&R LEDs , Main Input/Direct In Level Meter (8-segment LED chain) , power LED

Cabinet Material


Cabinet surface



483 mm


44 mm


217 mm


3 kg

Accessories (included)

Power Cord

Headphones ouputs

6.3mm TRS

Minimum connected impedance

8 Ohm(s)

Frequency response

20 – 20000 Hz

Operating voltage

110 – 120 V ~ 50/60 Hz or 220 – 240 V ~ 50/60 Hz, switchable


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