HA400 Headphone Amplifier -4 Channel Metal Stereo Audio Amplifier, Mini
Quick take
The HA400 is a compact 4-channel headphone amplifier that lets you split one audio signal to up to four listeners, each with independent volume control. It’s a practical choice for band tracking, studio or stage monitoring, and practice sessions where multiple people need to listen to the same mix. The main caveat is fit, make sure your headphones match the intended impedance range and note there may be no dedicated power switch.
Pros and cons
Pros
- 4 independent headphone channels, each with its own volume control for shared monitoring.
- Designed around 1/4" TRS headphone outputs with a 1/4" TRS input for a straightforward wired setup.
- Metal, ultra-compact enclosure (about 90 x 55 x 40 mm) that’s easy to carry for stage or practice.
- Uses a low-noise JRC4580 operational chip aimed at clean, high-gain audio.
Cons
- Impedance compatibility matters, it’s intended for headphones with roughly 32 to 100 ohm drivers.
- Some users report no on/off switch, which means you may unplug it to power down.
What buyers think
Buyer-review evidence is limited, but the feedback that is available points to a consistent theme: the HA400 is appreciated for being small and convenient while still getting loud enough for group listening during practice and tracking. Several buyers also mention solid build quality for the size and describe it as doing the intended job for headphone or in-ear monitoring. One recurring practical complaint is the lack of a dedicated on/off switch, requiring power control by unplugging.
What the HA400 headphone amplifier is for
If your setup involves more than one listener, the HA400 is built around that exact workflow. Instead of buying separate headphone amps for each person, you connect one audio source and distribute it across four headphone connections. Each listener can then adjust their own volume, which is especially useful for rehearsals, recording sessions, and live monitoring.
Key features that affect day-to-day use
Four channels with independent volume control
The HA400 provides separate volume controls for each headphone output. That makes it easier for different people to find a comfortable listening level without changing the main audio source, which is a common pain point in shared monitoring situations.
1/4" TRS input and output connections
Connection is based on 1/4" TRS jacks, with a 1/4" TRS connector used for the signal input and 1/4" TRS headphones outputs. If your headphones use different connectors, you’ll want to confirm you can use the right adapters.
Compact metal build for stage and practice
The metal enclosure is designed to be portable, and its small footprint makes it practical for carrying between rooms, gigs, and rehearsal spaces. For musicians who want a simple monitoring box that does not take up much space, the form factor is one of the most obvious strengths.
Power and impedance fit (important before you buy)
The amp is intended for headphones with an impedance range of about 32 to 100 ohms. It also specifies an approximate maximum output level (and notes power capability in terms of output current in the 100 ohm context). If you use headphones outside the recommended range, you may not get the loudness or performance you expect.
Pros and cons recap
Buy it if you need a small 4-channel headphone amplifier to share one audio signal with multiple listeners, and your headphones fall within the intended impedance range.
Skip it or double-check compatibility if you want a model with a dedicated power switch, or you’re using headphones with impedance outside the listed target range. Also verify that your cables and connections can use 1/4" TRS without awkward adapter chains.
Alternatives to consider (by use case)
Since no specific competing models were provided, here are the main decision points for choosing something else in the same category:
- If you only need one listener: you may prefer a simpler single-output headphone amp to reduce cost and complexity.
- If your headphone impedance is unusual: prioritize models that explicitly match your headphone impedance and that describe power output in a way that aligns with your driver needs.
- If you frequently power on and off: look for a unit with a physical power switch, especially for rehearsals and frequent stage setups.
Verdict
The HA400 is a budget-friendly, purpose-built 4-channel headphone amplifier for shared monitoring. It stands out for independent volume control per listener, compact portability, and wired 1/4" TRS connectivity. Just make sure your headphones match the recommended impedance range and be prepared to manage power by unplugging if you prefer a physical on/off button.
FAQ
How many headphone outputs does the HA400 have?
The HA400 is designed for up to four headphone connections, with independent volume control for each channel.
What kind of connection does the HA400 use?
It uses 1/4" TRS connections, including a 1/4" TRS input for the audio source and 1/4" TRS headphone outputs. You may need adapters if your headphones or source use different connectors.
What headphones is it compatible with?
It’s intended for headphones with an impedance range of approximately 32 to 100 ohms, based on the product’s stated target driver range.
Does it have an on/off power switch?
Some buyers report there is no dedicated on/off switch, so powering down may require unplugging the unit.
Is the HA400 a good choice for practice or band tracking?
Yes, it’s aimed at situations where multiple people need to listen to the same audio source with separate volume control, such as practice rooms, recording sessions, and small stage monitoring.
Specifications
| Product Title | HA400 Headphone Amplifier -4 Channel Metal Stereo Audio Amplifier, Mini Earphone Audio Amplifier with 12V 1A Power Adapter, 1/4" TRS Headphones Output and TRS Audio Input for PC Guitar Studio Stage |
|---|---|
| Category | Electronics > Headphones, Earbuds & Accessories > Amplifiers |
| Brand | Zendstanding |
| Manufacturer | Zendstanding |
| Model Name | HA400 Headphone Amplifier |
| Model Number | HA400 |
| Form Factor | On Ear |
| Connectivity Technology | Wired |
| Noise Control | Sound Isolation |
| Item Weight | 0.3 Kilograms |
| Color | Black |
| Brand Name | Zendstanding |
| Built-In Media | Stereo Headphone Amplifier , Cable, Instructions |
| Age Range Description | Adult |
| Warranty Description | Manufacturer warranty for 2 Years from date of purchase |
| Number of Items | 1 |
| Headphones Ear Placement | On Ear |
| Headphone Folding Features | On Ear |
| Earpiece Shape | On Ear |
| Control Type | Volume Control |
| Control Method | Remote |
| Impedance | 32 Ohms |
| Audio Driver Type | Dynamic Driver |
| Enclosure Material | Composite |
| Specific Uses For Product | Gaming |
| Antenna Location | Music, Gaming, Stage and Studio Performances, Outdoor Performances, Small Concerts, Home and Outdoor Karaoke, Conference Speeches |
| Compatible Devices | Professional Audio Equipment, Computers, Select Audio Devices |
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