Montarbo HP-24 4-Channel Headphone Amplifier User Manual
- June 5, 2024
- Montarbo
Table of Contents
Montarbo HP-24 4-Channel Headphone Amplifier
Thank you for purchasing a Montarbo product, the Italian company founded in 1962, and since then serving music and audio. The unique and state of the art Montarbo products are designed with the utmost attention to detail and durability. Reliability is in line with the high quality standards and sensitivity to the environmental impact that distinguish the company.
Compact and powerful, HP-24 manages and optimises headphone listening up to 4 channels, making it the ideal choice for quality home studios and professional production. It combines high amplification gain with low distortion and allows using high-performance professional headphones. One auxiliary input and one auxiliary output also allow multiple HP-24 modules to be connected together if required, thus increasing the total number of available channels.
PACKAGE CONTENTS
- 1 x Headphone amplifier
- 1 x External power supply unit with interchangeable plugs (EU/UK/US)
- 1 x User Manual – Section 1
- 1 x User Manual – Section 2
AVVERTENZE
This manual warnings must be complied in conjunction with “User Manual –
section 2”. Please read the manual before using. Keep this manual handy for
future reference.
DESCRIPTION
-
INPUT LEVEL METER (L/R)
Allows displaying the stereo audio level, visually signalling any saturation/clipping. -
GAIN
Knob to adjust the amplification gain of the audio signal. -
VOL 1-2-3-4
These knobs adjust the individual output level of each channel. -
CH1-2-3-4 OUTPUT
Headphone output connectors on 6.35mm Jacks. -
DC INPUT
Bipolar connector for external power supply unit connection. -
POWER ON/OFF
Switch for turning the unit on/off. -
GROUND TERMINAL
Use if the hum in connections between different devices has to be eliminated. -
AUX OUT
Unbalanced auxiliary output on 6.35mm Jack connector.
-
AUX IN
Unbalanced auxiliary input on 6.35mm Jack connector. -
MONO/STEREO
Press this switch to switch between stereo and mono listening. -
BALANCED INPUTS (L/R)
Balanced input audio connectors (right channel R – left channel L).
TECHNICAL SPECIFICATIONS
| Frequency response | 10 Hz – 35 kHz |
|---|---|
| Noise ratio | 101.7 dB |
| Maximum input level | 5.5 dB (32Ω) / 12.2 dB (300Ω) / 12.3 dB (600Ω) |
| THD+N Ratio | 0.006% @1kHz 32Ω / 0.0008 % @1kHz 300Ω/600Ω |
| Maximum output power | 2 x 227mW@32Ω / 2 x 140mW@300Ω / 2 x 138mW@600Ω |
| Stereo isolation | 62.3 dB (32Ω) / 77.1 dB (300Ω) / 86.4 dB (600Ω) |
| Input impedance | 50 Ω |
| Input connectors | 2 x 6.35mm balanced, 1 x 6.35mm auxiliary stereo |
| Output connectors | 4 x 6.35mm stereo, 1 x 6.35mm auxiliary stereo |
Controls
| Gain control knob (0 – 20 dB)
STEREO-MONO switch
4 x independent knobs for volume control
Power supply
| Universal SMPS power supply unit with interchangeable plugs:
INPUT: 100-240V~ 50/60Hz 0.75A OUTPUT: 12V DC / 2A 24W