The RockBoard HA 4 is a compact headphone amplifier designed to distribute a stereo signal to four headphones with professional sound quality. Each output has an independent amplifier and volume control, making it ideal for studios, rehearsals, or stage applications where multiple musicians need to simultaneously monitor the main mix. Its robustness and compactness make it easy to transport and set up, offering personalized and precise listening for each user, whether in a home studio or a collective session.
| Number of Headphone Outputs | 4 stereo outputs |
|---|---|
| Volume Control | Separate for each channel |
| Input Type | 1 x 6.35 mm (1/4'') TRS jack |
| Output Types | 4 x 6.35 mm (1/4'') TRS stereo jacks |
| Signal-to-Noise Ratio (SNR) | 82 dB |
| Total Harmonic Distortion (THD) | 0.009 % |
| Frequency Response | +1 dB / -2 dB @ 20 Hz - 22 kHz |
| Gain | 20 dBu |
| Power Supply | 12V DC / 40 mA, 2.1 x 5.5 mm negative center plug (included) |
| Dimensions (L x W x H) | 102 x 58 x 45 mm |
| Weight | 182 g |
| Housing | Robust metal |
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