4-channel Headphone Amplifier
    Product # 615220
    4-channel Headphone Amplifier
    Product # 615220
    In Stock This item should ship tomorrow (2/24/2017) if ordered within 20 hours 44 minutes

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    4-channel Headphone Amplifier

    Expand your headphone monitoring capabilities with the addition of this 4-channel Headphone Amplifier from Monoprice!

    This amplifier features four 1/4" (6.35mm) amplified headphone outputs, each with its own independent volume control. It features an extremely clean amplifier circuit, which produces a signal-to-noise ratio greater than 98dB. It accepts line-level audio input over the stereo RCA jacks on the back or headphone level through the optional 1/4" TRS jack. A switch on the back allows you to choose a mono or stereo output. The amplifier is powered by the included 12 VDC/500mA AC adapter.


    • Inputs: 2x RCA and 1x 1/4" (6.35mm) TRS
    • Input Impedance: 100 K-ohms (unbalanced)
    • Outputs: 4x 1/4" (6.35mm) TRS
    • Output Impedance: minimum 10 ohms per channel
    • Maximum Output Level: +22dB
    • Maximum Gain: 20dB per channel
    • Signal to Noise Ratio: > 98dB
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    4.2 / 5.0
    18 Reviews
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Star
    Beware: Channel bleed!
    If you have audio running into the unit, and more than one set of headphones plugged in, you can hear audio bleed into another set of headphones when the volume knob is turned ALL THE WAY DOWN! Monoprice claimed that this was a defective unit. I was skeptical and followed their advice to do an RMA. The second unit arrived with the same issue. They again claimed this was a defective unit. They would not listen that THIS IS A DESIGN FLAW, not an issue with individual units. If the volume is turned down on that headphone channel, NO SOUND SHOULD COME OUT! The point of having four individual volume knobs is to adjust the volume individually i.e. one volume knob shouldn't affect the others. Beware of this channel bled defect!

    PROS: Well built. Different input types. Headphone jacks are on the front.

    CONS: Channel bleed!
    April 26, 2015
    First one was a dud
    I'll update when I get the next unit.

    PROS: Look solid. Sounded Great - until I plugged in the 2nd set of headphones. They I started loosing audio.

    CONS: With small ear buds and the volume knob all the way down i still hear audio.
    January 16, 2014
    Works, but not enough juice for me
    I originally got this unit so I could plug in a cable from the PA monitor out (unpowered) and connect up to 4 speakers (also unpowered). I got no signal from the monitor out, so I plugged it into the main out (powered). By turning the 4-way up all the way (on any channel) I could barely hear the sound at all. So I tried headphones, was quiet very quiet. This would definitely not work for my drummer (acoustic drums). Sorry to say but this didn't at all to what I expected. Looks like I need a real 4-output amplifier to do what I need.

    Description does not list a watt output either...

    PROS: - Good built quality

    - Comes with power adapter

    CONS: - Power adapter is only 500ma (should tell you how much power this unit really is
    March 17, 2014
    Great price. Works well. Timely delivery! What more can you ask for?
    February 7, 2017
    1 month ago
    Great Headphone Amp
    It works great for our application. Small and compact and for the price it can't be beat!!!

    PROS: Small and compact, volume knob for each channel instead of a slide

    CONS: no cons
    September 29, 2014
    615220 4-channel Headphone Amplifier
    Terrific company and terrific product.

    PROS: I am very happy with this product. I have a slight hearing deficiency. This 4 chanel headphone amp solved my problem while watching TV. I can now hear the dialog a lot better. My wife can listen to a normal level sound volume while watching TV and I can turn the volume up or down for my own personal listening level.

    This has made for very happy viewing.

    Thanks Monoprice for your excellent product, expediant shipping and careful shipping of my product.

    I wouldn't hesitate to recommend Monorprice nor this product to other perspective buyers.

    Michael Breskin

    CONS: None that I can think of other than the bright yellow light on light.
    February 26, 2014
    This is a great little headphone amp. I use it as a cheap alternative to in-ear systems in churches.

    PROS: Small, quality built, inexpensive. Good value for the money. Has 4 1/4 inch outputs and a mono/stereo switch

    CONS: None
    September 23, 2014
    Perfect box for recording
    I saw this at NAMM 2014. It was just what I needed. I have passive headphone boxes that I built years ago, but all my headphones, and the artists's headphones have different sensitivities and impedances. I'm often sending to 4 headphones while cutting tracks, and now I am able to give each musician their own level. I already had the Monoprice 1/4" TRS to TRS cables that I now use with this box. A small amount to spend to achieve such a big improvement in live recording.

    PROS: Simple, small and inexpensive.
    February 22, 2014
    Monoprice delivers again!
    Solid little 4 channel headphone amp. I've only tested with 1/4" TRS in, but haven't experienced the crosstalk that other reviewers have complained of, even at mixed hi/low/silent volumes. I've also used this with different loads (some 600O studio cans, some 25-50O) and though the 600O load is certainly noticeably quieter, it's still plenty of volume for recording monitoring purposes.

    PROS: Excellent value, plenty of power, reasonably durable

    CONS: None experienced
    September 19, 2015
    Great little splitter for headphones
    Fantastic and inexpensive little headphone amp.

    Note that this is ONE amp for four headphones, not four amps. It splits the signal and lets you adjust levels. At this price, it's hard to beat. Great for recording an interview with a couple people wearing headphone monitors.

    PROS: 1/4 inch or RCA in

    4 x 1/4 out

    Amplifies and lets you set four levels independently


    CONS: Only a single amp - not four individual amps

    Annoying wall wart (expected)
    June 13, 2014

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