Montarbo HP-24 4-Channel Headphone Amplifier User Manual

June 5, 2024
Montarbo

Montarbo HP-24 4-Channel Headphone Amplifier

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

Montarbo HP-24 4-Channel Headphone Amplifier 1

Montarbo HP-24 4-Channel Headphone Amplifier 2

  1. INPUT LEVEL METER (L/R)
    Allows displaying the stereo audio level, visually signalling any saturation/clipping.

  2. GAIN
    Knob to adjust the amplification gain of the audio signal.

  3. VOL 1-2-3-4
    These knobs adjust the individual output level of each channel.

  4. CH1-2-3-4 OUTPUT
    Headphone output connectors on 6.35mm Jacks.

  5. DC INPUT
    Bipolar connector for external power supply unit connection.

  6. POWER ON/OFF
    Switch for turning the unit on/off.

  7. GROUND TERMINAL
    Use if the hum in connections between different devices has to be eliminated.

  8. AUX OUT
    Unbalanced auxiliary output on 6.35mm Jack connector.

  9. AUX IN
    Unbalanced auxiliary input on 6.35mm Jack connector.

  10. MONO/STEREO
    Press this switch to switch between stereo and mono listening.

  11. 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

References

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>

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