TWS Bluetooth Amplifier Board, PEMENOL DC 7-24V 100W Mono Audio Power Amplifier Module with Box Matching Function Support AUX/Bluetooth/USB for DIY Electronic Kit Car Home(ZK-1001B)

these little beasts really do the job. I have used a number of the to build Blue Tooth speakers and they work very well and pair quickly.

Very good Class D Amplifier for this priceThis is class D amplifier (sometimes it is called “digital” amplifier.The advantage of class D is very high efficiency >90%.The disadvantage is higher distortions, but in most applications, it wouldn’t matter, and people wouldn’t hear it.I powered the amplifier from the bench Power Supply and tested it at different voltages, measuring the input power (Pin, W) and the output power (Pout, W) at 4 Ohm load, using sinewave generator at my phone over Bluetooth, as the input signal.Two Oscilloscope channels were connected to two output terminals (this is a “bridge” amplifier and load is connected between two active outputs). The output peak-to-peak voltage (Vp-p) was measured.The output power was calculated Pout = ((Vp-p) * 0.7)^2 / 4.Volume was adjusted to provide maximum output amplitude without clipping.Results (1kHz, 4 Ohm):Vin = 12V, Iin = 1.3A, Pin = 15.6W, Pout = (11.0*0.7)^2 / 4 = 14.8W, Efficiency = Pout / Pin * 100% = 95%Vin = 16V, Iin = 1.6A, Pin = 25.6W, Pout = (14.0*0.7)^2 / 4 = 24W , Eff = 94%Vin = 20V, Iin = 1.95A, Pin = 39W, Pout = (17.0*0.7)^2 / 4 = 35.4W, Eff = 91%Vin = 24V, Iin = 2.25A, Pin = 54W, Pout = (19.8*0.7)^2 / 4 = 48W, Eff = 89%• Note: The Amplifier output was shutting down after 10 seconds and coming back in a few seconds as a result of over-temperature protection., because the Test was conducted with the continues sinewave and the amplifier is not designed for this condition. Normal audio signal has significantly lower average power.Result (1kHz, 3 Ohm):Vin = 24V, Iin = 2.98A, Pin = 71.5W, Pout = (19.6*0.7)^2 / 3 = 62.7W, Eff = 88%• Note: Over-temperature protection was shutting down the output after 1 second and coming back in a few seconds.•Frequency Response:20Hz – 18kHz• Note: My Generator lowest frequency is 20Hz and I couldn’t test it below.• There is no output signal above 18kHz.What I like:Small sizeQualityEfficiencyBT and analog inputWhat can be improved:The heatsink is attached with double-sided tape, which is not very secure and doesn’t provide good heat transfer.Conclusion:Very good class D amplifier for the money

Great little amp for a DIY bluetooth speaker. Pretty simple assembly, and mounting. My only ding is that its rated for 100W, if you go with a 150-160W speaker at full volume you'll get a little distortion. Might need to go with a 200W instead.

It’s velcroed to, and using only 12v 3A power supply. Other reviews on wattage was near perfect for my 20 watt driver in a cup for hanging out and tailgating. Only needs 96 watts, so I can use my small Ryobi 150 watt inverter. Added a tiny blower fan 12V 0.1A aimed at the heat sink. I scraped off a square center of heat sink adhesive and placed a drop of thermal paste. Also, turned it all the way up and pulled out knob as it’s not needed. Bluetooth is automatic when powered up and just use volume on my phone, at 100% volumes on both amp and phone, no distortion heard; I did place dampening stick on pieces inside the cup. Very happy and is very loud, make the cup dance around a bit if not in a cup holder.

I build and gift Bluetooth Boom Boxes to Vets and under privileged young people. These help make that possible because of price and quality

Endless loop of beeps trying to connect and fail to connect. Still using as they are simple amps and sound great, they do the job if you do not care about linking two together

Great power output for the size, doesn't use too much power. The TWS is a pretty cool feature for pairing 2 of these unit together.This is exactly what you're looking for if you're building a boombox/rugged speaker. I would absolutely recommend this one for use in single speaker, lower wattage applications. Especially when battery powered. Protip, run this at 24v for max power output

Although it doesn't come with the instructions on how to connect two together (TWS Mode), I found what I believe is that resolve.Connect One amp to a bluetooth source (phone, mp3 player, etc), and leave the other disconnected from said bluetooth source. Click the potentiometer (volume knob) three times on the amp that is connected to the source. Then click the second/other (disconnected) potentiometer three times. Both amps should show a rapid flashing blue/red light indicating they have activated 'pairing mode'. In 1-5 seconds you should hear an audio sound from both amps/speakers. The flashing lights will then show synchronized slow flashing.Note: Although they are now in 'tws mode' volumes are still individually maintained.I have purchased a total of 19 of these amps over the course of 2 years (used in bluetooth speaker boxes). Every Single One is still in perfect working order. When using the correct power and speakers, these things are monsters of sound. I highly recommend.Buy one or two, and make up your own mind.