I bought this because I have trouble hearing the TV and I’ve already tried various wireless headphone devices without success. Those that required batteries used them up fast, especially when I didn’t remember to turn the unit off. Then, they had to be synced every time I changed the batteries. Others needed to be recharged between sessions and would run dry in the middle of a movie. Others had the hardware built into the headphones making them heavy and requiring replacement of the whole system when the headphones wore out.

Finally I discovered this little headphone amp and I couldn’t be happier. To my slightly inadequate ears, it sound very clear and it has far more amplification that I can ever use. My wife uses one of the other outlets occasionally and, of course, there’s a couple of spare jacks if I have any hard-of-hearing company. It has a power supply so no more piles of dead batteries.

I’d recommend it for anyone who wants to get a boost or extra ports for any device. It’s amplification is far greater than any of the devices I tried that are made for personal music players. Although it has 1/4″ output jacks, you can buy 1/4 to 3.5 adapters for pennies on Amazon and have an amp that will work with the more common size for an incredible price.

I’m using the headphone amp at the end of a cheap 30 foot cable but it still works very well and the volume controls are smooth and without static. The amp puts out more sound than my ears can, or should take. Unlike most of the other devices I tried, it has the power to drive any headphones I want, including noise cancelling. Finally I can enjoy a movie and hear what everyone is saying.

Do not let the size fool you. This is a very handy piece of equipment and it’s so easy to set up and use. Just plug a 1/4 inch stereo cable into your sub out on your mixer and then into the HA400, then plug in up to 4 pairs of headphones and your set to track overdubs. This is perfect for a small home studio on a budget and it’s built like a tank. Be forewarned that this a very basic headphone distribution system, you can only adjust volume from the HA400 and it would be wise to purchase a real long 1/4 stereo cable and extensions for the headphones if you want to isolate vocals.

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 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.