Behringer MicroAMP HA400 4-channel Headphone Amplifier (HA400d1)

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I got one of these to allow my wife or I to listen at whatever volume we want while keeping the TV speakers muted so the other person can sleep. It works just as I wanted and expected it to.The only problem is that it uses 1/4" TRS jacks for the input and outputs. This is fine if you're using it with standard recording studio/musician's connectors and cables, and of course, that's the market this amp was designed for. I think the manufacturer would sell a TON of these if they made a version with RCA jacks for the input and 1/8" TRS jacks for the headphone outputs. That would match what most consumers will have coming from their TV these days and what they'll find on their headphones/earbuds.So the issue becomes finding 1/8" Female TRS to 1/4" Male TRS adapters that aren't total junk. I tried a few different ones found here, and had extremely poor results from most of them. Most didn't make a secure positive mechanical or electrical connection. It's hard to imagine how they can even sell most of them! But again, this is NOT the fault of this little amplifier, it's just something to be aware of.I finally ordered some adapters from Parts Express (a seller who does sell here on Amazon), but I had to get them directly from that supplier since they didn't seem to have them available here on Amazon. I hope I can say that on here without it being censored or causing friction.Those adapters work perfectly. They fit tight and make solid electrical contact.With that problem taken care of, the unit does just what I need it to do, and the sound quality is plenty good for TV viewing. I'm not going to say that it's an audiophile-grade headphone amp, but it's really not bad at all.Having independent volume controls for up to four people is nice so everyone can use a setting that suits them. As I said, the main use for me is so either my wife or I can watch TV without disturbing the other person if they're sleeping or talking on the phone, etc. We just keep a couple pairs of headphones and this amp at our usual watching position, and it's very handy.I've seen complaints on here about buzzing or receiving AM radio broadcasts. I suspect that in all of these cases, the true culprits are either poor electrical contact when using crummy adapters or cables OR they've managed to allow the metal case of this unit to come into contact with something that's grounded (but not well) to another piece of their equipment, thus creating a "ground loop". Ideally, you will keep this unit's case electrically isolated from anything that might create a ground loop back to your audio source. With this amplifier and your headphones "floating" electrically from everything else, you will not likely get hum or buzz.And with good, solid electrical connections (avoiding poor adapters, etc), you will likely avoid any reception of strong AM radio signals in the area.All of this would be true of any amplifier.The sound quality is perfectly fine for an amp of this price range. It drives various headphones to levels far above anything I've needed. It seems to have fine frequency response and reasonably low distortion. The volume controls move smoothly and create no static. And I've been using it for a few years and had zero reliability issues.So I give the amplifier five stars for doing what it is supposed to do quite well.

Perfecto for My Needs!!! I was looking for an affordable way to use my Audiotechnica headphones on my computer when not using them on my personal music production gear. I just wanted to listen to tunes off my computer using my favorite H-phones. Unfortunately, as you all know, many laptops lack the "umpf" to power a pair of H-phones such as the above mentioned. I looked through the various makes and models considering price and feedback and decided on the HA400. With a price of under $20 and 4 input channels to plug in other things such as my computer speakers, I figured, "Why Not?"I tested it out as soon as I received it and was not disappointed. There was not just a noticeable difference,.. There was a "Mega-Difference" in volume output! The volume was so high that I was on the verge of blowing out my external pod speakers. I set both the H-phone and speaker levels at my preferred max on each channel and am now using the computer's volume switch as the main volume adjustment...the rest is history.THINGS I RECOMMEND THAT YOU CONSIDER PRIOR TO BUYING THE HA400!!!1. Though the thing is compact (will post pics showing the dimensions), it is not portable in the sense that you can listen to it on a road trip or on a bus headed to work. It runs soley on a DC 12 volt adapter and not on batteries.2. There is no power switch... Be prepared to hook it up to a power strip or buy a cheap foot switch if you want to turn it off using a switch rather than having to unplug it.3. You will need to buy proper adapters if you are using anything other than 1/4" male plugs. If you want to use 1/8" (3.5mm)- standard plug for a portable device such as laptop, then you will need a 1/4" (6.3mm) Male to 1/8" (3.5mm) Female adapter.4. You will need an Output / Input cord with one end 1/4" (6.3mm) Male to plug between your device and the HA400. It does not come with one.5. If you are a hardcore anal-retent about your audio quality, (ie. an audiophile), remember that this is not an EQ. All it does is split one output into 4 and amplifies the sound and it does it well.6. Other posters have experienced some degree of background noise, depending what you pug into it, you may also... As for me, I have yet to experience any discernible background noise. As far as I'm concerned, I'm happy with the pure sound being amplified.7. Remember that this thing was made for headphones and anything else such as hooking up speakers to it is basically "Jimmy-rigging". I hooked up speakers and had no problems dispite others having some.8. Again, I rate this item with 5 full stars because it was perfect for my needs. I can see how others may give it a lower rating on the basis that it was not what they expected to fulfill their own needs. As for me, if I could dedicate a song to this unit it would be, THE CARS, "You're Just What I Needed"...LOL.