HA4000 - Headphone amplifier Audibax - Free user manual and instructions
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| Product type | Headphone amplifier |
| Brand | Audibax |
| Model | HA4000 |
| Number of channels | 4 stereo channels |
| Inputs | 1 stereo line input (RCA and 3.5 mm) |
| Outputs | 4 stereo headphone outputs (6.35 mm) |
| Volume control | Independent volume knob per channel |
| Power supply | 12V DC adapter (included) |
| Frequency response | 10 Hz – 30 kHz |
| Signal-to-noise ratio | > 90 dB |
| Total harmonic distortion | < 0.01% |
| Dimensions (W x D x H) | 180 x 120 x 44 mm (approx.) |
| Weight | 0.5 kg (approx.) |
| Housing | Metal chassis with black finish |
| LED indicator | Power LED on front panel |
| Operating temperature | 0°C to 40°C |
| Storage temperature | -20°C to 60°C |
| Cleaning | Wipe with a dry, soft cloth; avoid solvents |
| Safety | Do not open the housing; no user-serviceable parts |
| Spare parts and repairability | Contact authorized service for replacement parts; professional repair only |
Frequently Asked Questions - HA4000 Audibax
How do I connect the Audibax HA4000 to my audio source?
Use the RCA or 3.5 mm stereo input on the back panel. Connect your audio source using a suitable cable, then plug your headphones into the 6.35 mm outputs on the front. Turn on the amplifier and adjust each channel with its volume knob.
Can I use the HA4000 with low-impedance headphones?
Yes, the HA4000 is designed to drive a wide range of headphone impedances, typically from 8 to 600 ohms. For very low impedance models, start with the volume at minimum and increase gradually to avoid distortion.
Why is there no sound from one of the channels?
Check that the corresponding volume knob is not at zero. Verify that the headphone plug is fully inserted and that the source signal is present. Try swapping headphones between channels to isolate the issue. If the problem persists, the channel may need service.
What is the maximum output power of the HA4000?
The exact power depends on the headphone impedance. As a typical guide, it delivers around 20 mW per channel into 32 ohms and 10 mW into 300 ohms. This is sufficient for most consumer and studio headphones.
How can I reduce background humming or hiss?
Ensure the power adapter is the original 12V DC type and not near audio cables. Keep input cables away from power cords. Use high-quality shielded cables and avoid ground loops by connecting all equipment to the same power strip. If hum continues, test with a different source.
Can I connect the HA4000 to a mixing console or audio interface?
Absolutely. The HA4000 accepts line-level signals, so you can connect it to the stereo output of a mixer, audio interface, or any device with a line out. Adjust the source output to a nominal level, usually around 0 dBV or -10 dBV.
Does the HA4000 have independent volume for each headphone?
Yes, each of the four channels has its own volume knob. This allows you to set different listening levels for different headphones without affecting the others.
How should I clean and maintain the amplifier?
Disconnect the power before cleaning. Use a dry, lint-free cloth to gently wipe the exterior. Do not use water, alcohol, or abrasive cleaners. Keep the ventilation slots free of dust to prevent overheating.
Can I use the HA4000 as a multi-room headphone distribution system?
Yes, the HA4000 is ideal for distributing one audio signal to up to four headphones. It works well in studios, classrooms, or home installations where multiple listeners need the same source. Each listener can adjust their own volume.
Is it safe to leave the HA4000 powered on for long periods?
The amplifier is designed for continuous duty and features robust thermal protection. However, to save energy and extend component life, turn it off when not in use. Unplug the adapter during storms or prolonged inactivity.
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USER MANUAL HA4000 Audibax
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Product information
Brand : Audibax
Model : HA4000
Category : Headphone amplifier