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.
| Product type | Headphone Amp: |
| Inputs | 2 |
| Inputs | 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, Max. Input leveling, Power OFF - Mute relay |
| 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 - 40000 |
| Total Harmonic Distortion (THD) | 0.04% |
| Controls | Balance L/R, Power / Volume, Stereo/Mono (Focus) switch |
| Indicators | Battery (low battery: red), Peak (Amber), Power LED (Power ON: green), Signal (green) |
| Operating voltage | 9 V block, 9 V DC power supply |
| Operating voltage | 9 V DC |
| Max. Current | Nom. 0.07 A / Max. 0.15 |
| Cabinet material | Plastic |
| Cabinet surface | Soft-touch |
| Cabinet colour | Black |
| Width | 80 mm |
| Height | 42.5 mm |
| Depth | 133 mm |
| Weight | 0,155 kg |
| Accessories (included) | Belt clip |
