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    Monoprice 4-channel Headphone Amplifier
    Product # 615220
    In Stock This item should ship tomorrow (9/19/2018) if ordered within 15 hours 5 minutes

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    Browse 5 questions Browse 5 questions and 14 answers
    what is the LINK jack used for and is it a 2 conductor or 3 conductor (TRS) jack?
    David G on Dec 31, 2017
    BEST ANSWER: Link is a 1/4” TRS that can be used to link multiple headphone amps together using a single TRS cable, Or you can use it to connect from the source headphone TRS output instead of using the RCA jacks. It is wired in parallel with the RCA jacks.
    Can this be used for recording on laptop by running Audacity? I will be recording some notes that I am plan to listen later. My setup will look like below.
    HeadSet -----> Amp Device ----> Laptop(Audacity).

    RameshKumar N on Apr 21, 2017
    BEST ANSWER: The setup you show implies that you want to monitor (headphones) an audio source while recording it (Laptop-Audacity). If you add an input source of the audio that you wish to record to your setup (Input to the 4-channel headphone amp), then yes, this will do the job. But as originally described, you have no source for the audio (notes that I plan to listen to later).
    Does the 1/4 input provide stereo as well, or only mono?
    A shopper on Apr 10, 2017
    BEST ANSWER: I ran a stereo 1/4 cable into it for stereo and it worked great for me. I didn't try a mono cable so I have no idea how that works.
    Will the mono switch help detect if one of the stereo channels is out of phase? In other words, if the left channel is 180 degrees out of phase from the right, this can be difficult to detect with headphones, but if the channels are summed to mono, the cancellation should be audible in each ear. Is this the case with this mono switch?
    New User U on Feb 11, 2018
    BEST ANSWER: Yes, when switched to mono it will combine signals. If you are out of phase you will hear a significant drop in signal.
    I am considering using it with a turntable with a built-in preamp. Would it suffice if I intend to use it with the Audio Technica ATH-M50X?
    New User U on Jan 26, 2018
    BEST ANSWER: Yes this headphone amp will work with any line level devise.
    4.4 / 5.0
    27 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
    Good unit, but with a crosstalk issue
    Nice unit for the price. the only downside I can see is that multiple headsets are connected and you turn down the set you are listening to, you still get a lower volume signal to your phones that sounds similar to a subwoofer running by itself. I am guessing that this is because the four knobs control the output of a single amplifier, but I am not sure, since I haven't opened it up or looked at a schematic.

    Bottom line: For the low price this is a great deal. Just be aware of the cross talk issue.

    PROS: Inexpensive, solidly built metal case, good solid sound, drives headphones better than computer or phone audio out..

    CONS: Cross talk between headphone outputs. Great for the price, though.
    April 6, 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
    Sh*t the bed after about 3 weeks
    worked for about 3 weeks, now its dead. No power LED, no volume on outputs. Source is definitely sending audio to the unit.

    PROS: cheap

    CONS: cheap and no longer works.
    April 20, 2016
    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
    A Good basic headphone mixer
    I needed something to send a headphone feed to a couple of people in another room for a project. This basic little headphone mixer did the trick. It's stereo only but for me that was just what I needed. For the price you can't go wrong.
    April 8, 2017
    1 year ago
    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
    super-warm sound and nice gain for my multiple headphones.
    July 10, 2017
    1 year ago
    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