DIFIIFOL Battery Powered AC/DC Bluetooth 4.2 Digital Amplifier Home Audio JT-30BBT,Dual Channel 2x15W RMS + Level VI Power Supply

For $25 with Bluetooth and an audio jack it sounds good enough under the right circumstances.Bluetooth: when connected via Bluetooth there can be a high pitched whine if you increase the volume using the built-in volume adjustment. I set the volume low on the device and change the transmitted volume on my phone.Audio jack: I don’t hear the high pitched whine when using the audio jack. However, when the volume of the amp is low I do hear a constant droning when nothing is playing or the volume of my source is low. Oddly enough it goes away if you increase the volume adjustment and lower the volume output from your devices. However, if you increase the amplification you then get noise. The droning isn't coming from my devices as it remains even when I unplug everything.Overall, I’d say it’s not perfect, but a decent bargain. I’ve tried and returned more expensive amps that were much worse.It has nice looks. I can’t stand the blinking blue LED that starts when connected via Bluetooth and playing music. If it were smaller, dimmer, and/or didn’t blink it’d be fine.

This amplifier looks like it is an exact copy of the Sonic Impact amplifier from around fifteen years ago. Dayton Audio still sells a version of it, too. The differences are the Difiifol amplifier has Bluetooth technology added and the amplifier chip is, I assume because I did not open it up to check, not the same 2 x 15 watt chip that was the darling of the low, low cost audiophile crowd that lauded the Sonic Impact amp back then. It works as advertised. The battery power allows for it to be used anywhere you want to take it. The sound is good and the Bluetooth works fine for me. The low cost of less than $20 with a power supply for it, too, makes it a very good bargain. If you are in the market for an item like this, I can recommend you purchase it and see if it meets your needs.

Not really worth the cost. I get some type of feedback from my speakers as soon as I begin to raise the volume.

I didnt have any instructions for Bluetooth pairing but figured it out. The amp didnt work at all first time I hooked it up, contacted seller through Amazon and got it to work but not sure I did anything different. Sounds great, especially for this price point. Will buy again for other projects

We are very happy with the cost and quantity of the product. Perfect for what I was looking for and excellent controls

This amplifier has a special outlook, very compact size. I used this little amplifier with my speaker drivers. I was surprised by the performance of this amplifier. how such a small and lower power amplifier can produce so much volume, and the sound is so crisp. The power adapter included is DC12V2A and has three plugs, US, AU, and EU, it is flexible to change another standard plug if you need. It is my first time to use an amplifier can be put lithium battery AT the bottom slot instead of a power adapter. It is a so cool experience.Although the blue led light is a little shiny, I am satisfied with this amplifier.

This is a great little amplifier for me. While not high end audiophile quality it is very powerful and quite clean for what it is. Works great for a desktop audio system with my Walkman or computer and for better stereo sound with my tv. Plus battery power option! I can't imagine getting a better amp for the money.

I'm using this with two old time "bookshelf" speakers in the bedroom. To my delight, I can do pretty much anything I could ever do with a legacy rack system. The future totally doesn't suck after all. I love it.