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

Pleasantly surprised. Using this in my classic car so I don't have to change out my radio. Now I stream from my phone. Has good power. Bluetooth connected easily. For directions , you have to scan a QR code. So this has a hook up for 2 speakers and a uncovered sub. I used a sub from an old home entertainment center ( laugh if ya want) and my system sounds very good. For 25 bucks..it so worth the purchase. Now let's see how it holds up with time.

Nice little amp. Works as intended. Dialing in sub frequency makes this amp!

I've tried 5 bluetooth receivers/amps in the last few years. This is the only one that works perfectly. It connects to all my devices, no interruptions, no weird static without input, no hissing added to music, no buzzing, just pure music. This is absolute bliss, thank you!

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.

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.

Works excellent

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.

Buenísimo