Professional 16-600Ω Headphone Amplifier with Bass Boost, Portable HiFi Earphone Amplifiers, Gain Switch Bass Volume Adjust, Rechargeble Headphone Amp 3.5mm Jack for Phones, iPad, MP3, MP4

After owing several headphone portable amps I can tell if it is any good.. enough power.. and clarity plus bass boosted for when you absolutely must get down in the hood.

I use this between my scanner and my headset at NASCAR races. I was previously using a Boostaroo. This is WAY better. Seems very well built. Battery life is great, sound quality is great, recharges quickly. My son liked it so much he bought one too.

This is a good addition to your audio great bass control great volume boost also a high definition low definition switch which is good if you using different types of headphones

Works great. I have severe hearing loss and this makes it so that I can still blast my tunes.

It might clean up the noise and does make bass adjustable but it is more quiet than just coming out of my phone I can barely hear the music when turned all the way up. When this thing is connected.went back to just listening out of my phone this thing definitely does not amplifie

Fantastic headphone amp and at the best price!

When I first tested the amp, I set the bass boost dial to zero (0). I did not understand why the signal was mono (monaural) until I decided to give the bass boost a try. At two (2) on the dial, the stereo sound finally came out, but the more I increased the bass, the more there was a stereo "surround" sound effect, until it finally became like a karaoke effect (which is an effect that amplifies stereo signals and minimizes monaural signals, such as a lead singer's voice, which is usually recorded in mono, thereby making it easier to sing along to).Unfortunately, there seems to be no way to use the bass boost without the added karaoke effect. The bass boost itself is GOOD, and it really does work, but I wish they would not have meddled with it by adding the unsolicited stereo sound effect.I have only tested low impedance headphones with the amp, so I do not know how effective it is with high impedance headphones. Having said that, the amp did little to nothing to boost the signal, even with High Gain on. In fact, there really isn't much difference in volume between high and low gain. The amp itself is quiet, ineffective, and is just more of a novelty than anything else. I actually would be willing to pay more money for another amp just like it if it were to have separate bass and stereo effect ("karaoke") dials and a little more power to the amp. But leave my bass alone.Also, there is a slight white noise effect when powered on (we used to call it "tape hiss" back in the 80s and 90s), so don't expect it to be a perfectly clean signal.

real good head phone amp!i use this with my smart tvand a real good set of head phones for movie theater sound!it is hard these days to find a good amp setup for the headphones.the battery life is better than expectedi get over a week of 12 hours a day!no kidding!and it charges back up on an over night.yea you need one of these!