Bluetooth Audio Amplifier Board, ZK-TB21 2.1CH 50W x 2 +100W Subwoofer Power Amp with Treble and Bass Control, Bluetooth5.0 and AUX Inputs, Stereo Digital AMP for DIY Home Speakers

This small amplifier module is very convenient to package and connect. Both electrically and via BT.Music is clear and representative depending on speakers used but very easy to setup and enjoy quickly. Great value for automotive and rv applications.

Huge upgrade for my toolbox sound system! This unit fit perfectly inside the shelf on my husky tool box(see pictures). I picked up a Coby sub from the thrift store store for $6 just to test it out. Sounds great! The bass and treble adjustments work surprisingly well. The sub frequency and volume work as expected. The Bluetooth works from across the shop so I can keep my phone in my pocket while I work.

Love the amp. the controls all work great and it pushes out a lot of sound. After using it for 9 months or so tho - the BT started randomly connecting to phones that had no pairing with it previously. This cuts out the 1/8" audio jack input if you are using it. It seems fairly random, but has been happening more frequently lately. Unfortunately there's no way to disable / turn off the BT so there's no way to fix this w/out possibly doing some DIY work on the unit to add a switch to that circuit.

Outstanding!!!

I'm an audiophile and I will say there are far better amps built on this chip that I would recommend for a desktop system for more critical listening. On the other hand for many use cases such as background music from cieling speakers or my use a hidden audio system in a classic this is a great value. In my case I used this in a 1967 Austin Healey, for that use case it is perfect. Was able to replace the ugly 80's cassette player with a blanking plate and hide this tiny unit under the dash. Because of the small and tiny speakers I could fit in there I don't expect to listen to music much but it is ideal for podcasts and talk radio on xm frommy phone. Considering this is around 20 bucks it's a great option. Only negative are that included pigtail for power has laughable small gauge wire and the ring terminals are very small.

Easy assembly, great sound, so easy to use. Bluetooth easy to connect! You have to assemble casing, not hard. I use a 7.5 amp 12v power supply, and I have no problems with sound, I have 2 bose shelf speakers, and a Sony unpowered sub, sound is amazing. I have the TV hooked up to the aux-in and my phone to Bluetooth, you have to disconnect BT to use aux, but so worth every penny!

Don't waste your time with the simple, stereo unit available, I purchased one of these some time ago, and was pleased.However —This 2.1 ( stereo + subwoofer) sounds MUCH better. So many ways to adjust your audio to soothe your ear holes.Will function with less than 12 volts, but I wouldn't recommend it, the more power you supply, the more you get out. 12 volt yeilds great sound with little distortion or clipping.I've yet to test with the 30 volts it's capable of.I plan to try the 5.1 for my next project.GREAT PRODUCT

Bought wanting the option to add a sub later. Have full-range polks. Might be wrong, but to my ears there is some low-pass filtering below ~120hz. I get far less bass in comparison to other recievers (e.g. onkyo TR608). Sound is decent otherwise, especially for the price. As others have said, tons of gain, using with my preamp is overkill.