* The inscriptions or colors on the product may differ slightly and the information in the description is written in general, so not all product features may be mentioned.
LD Systems HPA 1 - Amplifier for headphones and wired IEM
Technical Specifications
| Product type | Headphone Amp: |
| Inputs | 2 |
| Inputs | AUX In (Stereo) |
| Input connectors | 3.5 mm stereo jack (AUX In) |
| Input connectors | XLR-F (L + R Input, balanced) |
| Input impedance | 10000 (3.5 mm jack) Ohm(s) |
| Input impedance | 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 |
| Protection circuits | Max. Input leveling |
| Protection circuits | 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 |
| Controls | Power / Volume |
| Controls | Stereo/Mono (Focus) switch |
| Indicators | Battery (low battery: red) |
| Indicators | Peak (Amber) |
| Indicators | Power LED (Power ON: green) |
| Indicators | Signal (green) |
| Power supply | 9 V DC power supply |
| Power supply | 9 V block |
| 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 |
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.
- Country of origin
- China
- Customs tariff number
- 85184000
** All information about delivery and payment options can be found here - Delivery & Payment options.
*** Caution! Note that carrier is delivering goods to the doors if the parcel weight is not higher than 30 kg. All parcels higher than 30 kg must be handled by client.




