LD Systems HPA1 Headphone Amp

Specification

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.

• Product number: LDHPA1
• Product type: Headphone Amp:
• Type: 1-channel stereo
• Inputs: 2, AUX In (Stereo)
• Input connectors: 3.5 mm stereo jack (AUX In), XLR-F (L + R Input, balanced)
• Input impedance: 10000 (3.5 mm jack)Ohm(s), 6000 (XLR In)Ohm(s)
• Input sensitivity: -6 (3.5 mm jack) dBV, 3 (XLR In)dBu
• Max. input level: 7 (3.5 mm jack) dBV, 16 (XLR In)dBu
• Protection circuits: Audio Limiter, Power OFF - Mute relay, Max. Input leveling
• Headphones ouputs: 1
• Headphones outputs: 3.5 mm TRS
• Power Output (1% THD @ 33 Ohm Load): 2 x 1,65 Vrms
• Minimum connected impedance: 16 (per channel)Ohm(s)
• Frequency response: 20 - 40000Hz
• THD: 0.04%
• Controls: Balance L/R, Stereo/Mono (Focus) switch, Power / Volume
• Indicators: Battery (low battery: red), Signal (green), Peak (Amber), Power LED (Power ON: green)
• Operating voltage: 9 V block, 9 V DC power supply, 9 V DC
• Current draw: Nom. 0.07 A / Max. 0.15A
• Cabinet material: plastic
• Cabinet surface: Soft-touch
• Cabinet colour: black
• Width: 80mm
• Height: 42.5mm
• Depth: 133mm
• Weight: 0.155kg
• Accessories (included): belt clip