HP4 - Headphone amplifier Millenium - Free user manual and instructions
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| Product Type | Headphone Amplifier |
| Model | HP4 |
| Brand | Millenium |
| Channels | 4 independent stereo channels |
| Inputs | 4 x 1/4" TRS jack (balanced) |
| Outputs | 4 x 1/4" TRS jack (headphones) |
| Power Supply | 12V DC, 500mA (external adapter included) |
| Dimensions | 220 x 50 x 170 mm (rack-mountable, 1U half-rack) |
| Weight | 1.2 kg |
| Frequency Response | 20 Hz - 20 kHz (±0.5 dB) |
| Signal-to-Noise Ratio | >95 dB |
| Total Harmonic Distortion | <0.01% (1 kHz, 150 mW) |
| Output Power | 150 mW per channel at 32 Ω |
| Impedance Range | 16 Ω - 600 Ω |
| Controls | Individual volume knobs per channel, power switch |
| Indicators | Power LED (red/green) |
| Construction | Metal chassis, rack ears included |
| Operating Temperature | 0°C to 40°C |
| Storage Temperature | -20°C to 60°C |
| Cleaning | Wipe with a dry, soft cloth; do not use liquids or abrasives |
| Safety Notices | Use only the supplied power adapter; do not expose to moisture; disconnect when not in use |
| Spare Parts / Repairability | Contact Millenium support; no user-serviceable parts inside |
Frequently Asked Questions - HP4 Millenium
How do I connect the HP4 headphone amplifier?
Connect the power adapter to the DC input. Use balanced 1/4" TRS cables to connect your audio sources to the inputs (channels 1-4). Plug your headphones into the corresponding output jacks. Ensure the volume knobs are turned down before powering on.
What type of power adapter does the HP4 require?
The HP4 requires a 12V DC, 500mA power adapter with a center-positive tip. Use only the included adapter or a compatible replacement to avoid damage.
Can I use the HP4 with low-impedance headphones?
Yes, the HP4 supports headphones from 16 Ω to 600 Ω. It delivers up to 150 mW per channel at 32 Ω, suitable for most studio headphones.
How do I clean the HP4?
Disconnect the amplifier from power. Wipe the exterior with a dry, lint-free cloth. Do not use alcohol, solvents, or abrasive cleaners. Avoid getting moisture inside the unit.
What is the frequency response of the HP4?
The frequency response is 20 Hz to 20 kHz with a tolerance of ±0.5 dB, ensuring accurate sound reproduction across the audible spectrum.
Can I use the HP4 in a rack?
Yes, the HP4 is designed for rack mounting. It occupies a 1U space and includes mounting ears for standard 19" racks. You can also place it on a desk.
What do the LED indicators mean?
The power LED lights up red when the unit is powered off (standby) and green when powered on. No other indicators are present.
Is the HP4 suitable for balanced inputs?
The inputs are 1/4" TRS balanced jacks. You can use balanced or unbalanced cables. For best noise rejection, use balanced connections.
How can I reduce heat buildup on the HP4?
Ensure proper ventilation around the unit. Do not stack other equipment directly on top. Keep it away from heat sources. The metal chassis helps dissipate heat.
What should I do if one channel stops working?
Check the input cable and source. Swap headphones to another output to isolate the issue. If the problem persists, inspect the volume knob for damage. Contact Millenium support if needed.
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USER MANUAL HP4 Millenium
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Product information
Brand : Millenium
Model : HP4
Category : Headphone amplifier