Mackie HM Series, 4-Way Headphone Amplifier Mixer Accessory 1-ch x 4 Headphones (HM-4)

(10 customer reviews)


  • Share a single stereo source with up to 4 pairs of headphones
  • Individual level control for each output
  • Powered via the included 12V AC adapter
  • Built-like-a-tank construction
SKU: B079C8MLG8 Category:


The ultra-compact HM-4 4-way headphone amplifier features a 1/4” stereo input and four 1/4″ headphone outputs with individual level controls. Perfect for studios or even at home when up to four people want to listen together.

From the manufacturer

Mackie HM-Series Headphone Amplifiers

Mackie HM-Series Headphone Amplifiers

Mackie HM-Series Headphone Amplifiers

Excellent sound quality

Premium analog circuitry and design delivers an ultra-low noise floor and high headroom.


From a simple yet effective way to split a single stereo signal out to four pairs of headphones to robust headphone distribution, the HM Series offers a wide range of options to suit your needs.


With a heavy-gauge steel chassis, long wear potentiometers and switches, the HM Series is built to last.

HM-4 4-Way Headphone Amplifier

Share a single stereo source with up to 4 pairs of headphones.

Individual level control for each output.

Powered via the included 12v AC adapter.

Built-Like-A-Tank construction.

HM-400 4-Channel Headphone Amplifier

L/R Main stereo inputs plus L/R stereo outputs.

7-segment LED metering per channel plus Main.

3 headphone outputs per channel.

Aux input on each channel with balance control to mix main and aux signal.

Mute and stereo/2-ch mode switches per channel.

12 total headphone outputs.

Built-Like-A-Tank construction.

HM-800 8-Channel Headphone Amplifier

2 discrete main stereo inputs with separate level control plus stereo outputs.

7-segment LED metering per channel plus Main.

2 headphone outputs per channel.

8 independent Aux inputs for up to 8 individual stereo mixes.

Input Select and Stereo/Mono switches per channel.

16 total headphone outputs.

Built-Like-A-Tank construction.

Additional information

Weight 8 kg
Dimensions 4.3 × 2.3 × 2 cm
Item Weight

8 ounces

Product Dimensions

4.3 x 2.3 x 2 inches

Country of Origin




Item model number


Date First Available

January 27, 2018

Color Name



1-ch x 4 headphones



10 reviews for Mackie HM Series, 4-Way Headphone Amplifier Mixer Accessory 1-ch x 4 Headphones (HM-4)

  1. J. Niemi

    LOUD CLEAR SOUND: NO HUM, NO NOISE, JUST PROFESSIONAL, PERFECT SOUND QUALITY!I’m a record producer and mixing engineer with over 35 years of experience and I’ve worked and/or collaborated with multiplatinum talent, Grammy winners/nominees and people with Billboard #1 hits over the years. I can say safely this is the best headphone preamp on the market. Mackie is a very well-known brand for their top notch mixing boards, and this meets their standards. The volume knows are very smooth and have a sturdy, almost weighted feel to them. Other headphone amps I’ve had, the volume knobs or sliders usually felt cheap and would crackle when you changed the volume. NOT this one. The sound quality is absolutely pristine with no noise, no crackle, no hum. I use AKG Q701 Quincy Jones signature series headphones, which sound amazing but run quieter than other headphones I’ve owned. This preamp has saved the day. It gets so loud that I have to be careful not to turn it up too loud so I don’t hurt my ears or damage my headphones, which is exactly what I was looking for. You can listen quietly and it sounds perfect but if you need loudness (due to having quiet headphones, like me, for example), this will absolutely DELIVER. Emphatic 5 stars from me!!

  2. Mike Halloran

    Best small headphone amp you can buy.The HM-4 has one job to do and does it well. It splits a single headphone out into 4, each with its own volume control. Sound quality is extremely good and there’s plenty of volume for most headphones (at least, all the ones I own). It is also the quietest ‘phone amp I’ve ever owned. I would pay twice as much—but am glad I don’t have to. I’ve bought three so far for friends’ home studios.

  3. Kristin S

    Just what I neededGot these for my beyerdynamic 770 pro 250 ohm cans and it works great. Solid too

  4. C. Palmer

    Love itGreat controller for the money!! Better than other ones out there.

  5. Miguel A. Sotomayor

    Excellent.No loss in sound quality.

  6. The Ringer

    Huge bang for the buck.Needed to add some headphone outputs to my single-output Apollo solo interface.This connects with a single 1/4″ TRS cable, so you can run the headphone out of your interface directly into this thing with one cable. Very convenient.I don’t notice a difference in quality or output power between this and the interface, and the interface has one of the better headphone outputs I’ve seen for audio interfaces.Mackie hit a home run with this one and the price is unbeatable.

  7. E Z

    Don’t think twiceExcellent, absolutely no compromise. superb build quality. Don’t think twice.

  8. Joseph Hibbs

    Great STEREO Headphone Amp for the PriceThis headphone amp is well worth the $40 that I paid for it. Well built, solid construction with super clear sound, with plenty of volume. And for those reviewers that say this is a mono amp, its not!! It has stereo input/outputs. I think these people who say it’s mono don’t realize that you need to use a TRS (tip, ring, sleeve) cable that sends a stereo signal as opposed to a regular instrument cable (TS) that only sends a mono signal. Don’t hesitate to purchase this amp if you need a small, basic portable headphone amp.

  9. bto

    I promise this is a stereo unit.This product is stereo which many people seem to be having problems with I’m willing to bet they are using a ts cord or 1/4 guitar cord to bring in signal not a trs cord or balanced stereo cord. Of course it’s going to be mono and missing a channel if you use a single channel cord. Being a entry level product I’m willing to bet this is their problem. My theory is further supported when I see pictures of people summing a mono line to both channels by holding it at half plug. Technically they might as well be using a monto to stereo converter.My major gripe with the amp is it can get a lot of noise on the input if you don’t have your cord twisted the right direction allowing a proper ground. One you have it set and twisted right the amp works just fine. I have plugged 5 different sets of phones into it. From 40 dollars to 400 dollars. The amp will do what described but the product could be built better. I would rather pay 60 for it if they would put better jacks in the unit, specifically the input of i could only choose one. The pots them self i Are smooth and clean when new. Remember abuse and smoke will mess them up.

  10. Echo

    As advertised and more!I’m beginning to explore my engineering chops and based on research these headphone amps were a must. So far my production is clear and clean. I also enjoy controlling the volume from the amp instead of reaching for my Focusrite.

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