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
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AI Verdict
This is a 4-channel, 10.7-ounce metal headphone amplifier with 1/4" TRS input/output, designed for sharing a single audio source with up to four users, each with independent volume control.
This amplifier is a situational fit for those needing to split a single audio source to four headphones with individual volume control on a tight budget. Its 40mA output at 100Ω is suitable for headphones within the 32-100 Ω range, but user reports of noise and connection issues limit its appeal for critical listening.
If you need cleaner audio or more robust connections, look for amplifiers with a higher signal-to-noise ratio and locking power connectors.
Regret Score™
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Pros
- Powers up to four pairs of headphones with 32-100 Ω 50mm drivers, each with independent volume control.
- Features a compact metal structure, measuring 90x55x40mm, making it easy to transport.
- Utilizes a JRC4580 operational amplifier chip for high-power stereo output.
- Provides individual volume control for each of its four headphone outputs.
- Can make some headphones, particularly those lacking bass, sound louder and more impactful.
- Functions effectively as a signal splitter, making it convenient for multiple listeners.
Cons
- Users frequently report noise and hum, especially when increasing gain, despite claims of a 'low noise' chip.
- The 1/4" headphone jacks can be inconsistent, sometimes requiring wiggling or re-inserting to achieve stereo sound or any audio output.
- The power cable connection is often loose, leading to accidental disconnections and power loss.
- Lacks an on/off switch, requiring users to unplug the unit to power it down.
- May not provide sufficient amplification for high-impedance headphones or users with significant hearing loss.
Dimension Scores
While it claims a 'low noise JRC4580 operational chip,' users frequently report noticeable noise and hum, especially at higher volumes.
This product is a headphone amplifier and does not feature any active or passive noise cancellation capabilities.
This product is an amplifier and has no direct bearing on the comfort or fit of headphones.
The amplifier is powered by an included 12V DC adapter and does not operate on batteries.
Best For
- Small band practices or recording sessions needing multiple headphone feeds.
- Home studios where multiple musicians need to monitor a single audio source.
- Situations requiring independent volume control for up to four listeners from one source.
- Budget-conscious users needing a basic headphone splitter with amplification.
Not Recommended For
- Audiophiles prioritizing pristine, noise-free audio reproduction.
- Users needing a robust, secure power connection for critical applications.
- Headphones with impedance significantly outside the 32-100 Ω range.
Watch Out For
- The power jack is prone to being loose, causing the unit to lose power if bumped.
- Headphone outputs can be 'janky,' with some users needing to twist or re-insert plugs to get proper stereo sound or any sound at all.
- Turning up the volume too high can introduce noticeable interference and hum into the audio signal.
- Lack of rubber feet means the unit can slide easily on smooth surfaces, potentially leading to damage if dropped.
- Some users report that prolonged use at high volumes with this amplifier can degrade headphone performance.
Full Specifications
| ASIN | B0DDPSV1XN |
| Brand | Zendstanding |
| Color | Black |
| Material | Composite |
| Impedance | 32 Ohms |
| Model Name | HA400 Headphone Amplifier |
| Form Factor | On Ear |
| Item Weight | 10.7 ounces |
| Control Type | Volume Control |
| Manufacturer | Zendstanding |
| Cable Feature | Retractable |
| Ear Placement | On Ear |
| Noise Control | Sound Isolation |
| Control Method | Remote |
| Earpiece Shape | On Ear |
| Headphones Jack | 6.35 mm Jack |
| Number of Items | 1 |
| Special Feature | Foldable, Lightweight, Noise Cancellation, Noise Isolation, Volume Control |
| Audio Driver Type | Dynamic Driver |
| Item model number | HA400 |
| Compatible Devices | Professional Audio Equipment, Computers, Select Audio Devices |
| Hardware Interface | 1/4-inch Audio |
| Product Dimensions | 4.08 x 2.25 x 1.83 inches |
| Included Components | Stereo Headphone Amplifier , Cable, Instructions |
| Input Device Interface | 1/4 inch TRS jack |
| Noise Control Features | sound_isolation |
| Age Range (Description) | Adult |
| Connectivity Technology | Wired |
| Specific Uses For Product | Gaming |
| Recommended Uses For Product | Music, Gaming, Stage and Studio Performances, Outdoor Performances, Small Concerts, Home and Outdoor Karaoke, Conference Speeches |
| Supports Bluetooth Technology | No |
What Buyers Say
The most surprising finding is the frequent user complaints about noise and 'janky' headphone jacks, directly contradicting the product's claim of a 'low noise' chip and 'high fidelity.' Many users find themselves wiggling plugs or dealing with hum, which is a bummer for something meant to improve audio. Despite these issues, its compact metal build and individual volume controls are often cited as redeeming qualities for its low price point, making it a 'gets the job done' solution for basic splitting and amplification.
“Man, this thing is cheap and it works, but I gotta wiggle the headphone jack every time to get both sides to work, and there's this annoying hum if I crank it too much. Still, for twenty bucks, what do you expect, right?”
Common Praise
- The metal construction feels sturdy and durable for its size.
- Individual volume knobs for each of the four channels are highly functional.
- It effectively splits a single audio source to multiple headphones.
- Provides a noticeable volume boost for headphones that need it.
- Its small footprint makes it easy to place and transport.
Common Complaints
- A persistent hum or static noise is often present, especially when increasing the volume.
- The 1/4" headphone output jacks are loose or 'quirky,' requiring constant adjustment for proper sound.
- The power input connection is not secure, leading to easy disconnections.
- Lack of an on/off switch means you have to physically unplug it every time.
- Some users experienced degraded headphone sound quality or even damage after using the amplifier.
Ownership Tips
- You'll probably want to put some rubber feet on the bottom yourself, because it slides around like crazy.
- Keep a spare power adapter handy, or be super careful with the one it comes with, because that connection is flimsy.
- Don't expect studio-grade silence; there's usually a low-level hum, so it's best for monitoring, not critical listening.
- If you're using it for long sessions, consider a power strip with a switch, since the unit itself doesn't have one.
- Be prepared to jiggle the headphone plugs a bit to get a solid stereo connection, especially with new headphones.
Frequently Asked Questions
Does this amplifier require a special power adapter?
No, it comes with a 12V 1A power adapter. You just plug it in and it's ready to go.
Can I connect different types of headphones to it?
Yes, it's designed for headphones with 1/4" TRS connectors and an impedance between 32-100 Ω. You might need adapters for 3.5mm headphones.
Is there an on/off switch?
No, there isn't an on/off switch. To power it down, you need to unplug the power adapter.
Will this work with my guitar or PC?
Yes, it has a 1/4" TRS audio input, making it suitable for connecting to PCs, guitar multi-effects units, or audio interfaces for studio or stage use.
Can I control each headphone's volume independently?
Absolutely, it features four independent volume controls, allowing each connected user to adjust their listening level.
Buying Guide
When you're looking at a headphone amplifier like this, you're essentially buying a device to make your audio louder and split it for multiple listeners. Don't confuse it with a DAC (Digital-to-Analog Converter), which improves digital audio quality. This is purely about amplification and distribution. You need to think about how many people will be listening, what kind of headphones they have (especially their impedance), and how sensitive you are to background noise.
1/4" TRS Headphones Output and TRS Audio Input
This tells you the type of cables and headphones you'll need. TRS means it handles stereo audio, so you get sound in both ears. If your headphones or audio source use smaller 3.5mm jacks, you'll need adapters, which can sometimes introduce their own issues.
32-100 Ω 50mm drivers. Max. output level approx.40mA in 100Ω
This is about power. 'Ω' (ohms) is headphone impedance; it tells you how much power headphones need. This amp is designed for headphones in the 32-100 ohm range. If your headphones have a much higher impedance, they might not get loud enough, and if they're much lower, they might distort easily or even get damaged. The '40mA in 100Ω' is the maximum current it can deliver, which indicates its power output capability.
4-Channel Independent of Control
This means each person plugged into the amplifier can adjust their own volume without affecting anyone else. It's like having four separate volume knobs for four different headphones, which is super handy for group listening or recording sessions.
Alternatives
If this amplifier doesn't cut it, look for models with higher power output (measured in mW or Vrms), a better signal-to-noise ratio for less background noise, and more robust input/output connections, possibly with XLR or combo jacks.
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