Kinter MA-500 4-Channel Mini Amplifier with Remote USB MP3 Media Card FM 4x30W

Why do these higher models have a interference problem there smaller units work fine....

Does not come with power adapter. Not indicated anywhere that power cable must be purchased separately.

Listening to it right now while I write this and it's in my wood shop where it's been since it arrived and GREAT STUFF!

Ok, I'm a bit disappointed in this product. For the price I suppose that this is acceptable quality but ONLY at the price point. I got this because I had just bought some nice speakers but was moving into a dorm so I had to go with a small setup like this. This was the only one I could find that was small, cheap, and had 4 channels.Now that I have it I wish I had gone a different route. The biggest issue I have is that there is an INCREDIBLE whine that it gives off periodically. It does this when you aren't playing a lot and it is VERY apparent. It will also do this when you're playing music but you have to be listening for it. That being said most of the time you play music to listen to it so the whine is super annoying.I urge you to choose a different route unless the price is the only driving factor.

Bent button and audio was terribly distorted at 50%