XLX 2PCS TPA3118 PBTL Single Channel Digital Audio Power Amplifier Board Module 1X60W DC 12V-24V Converter for Audio System DIY Speakers

This tiny Amplifier is Absolutely Amazing. Using a 20 Watt rechargeable drill battery for a power supply works great, using one JVC speaker and a Bluetooth receiver plugged into the auxiliary in and WOW... I use it at work, it's an absolute head turner... At times it is actually too loud, this little sucker "pounds" the low end speaker, while covering the other ranges just fine. I was surprised to say the least as there was no heat radiating from amp whatsoever, it's also very easy on the battery.

Solid class D amp with plenty of oomph.These run great from 12V-24V, with little to no noise. Through holes are large, great for bigger wires. Even at consistent high power, these barely get warm.

Easy to use

One defective from 2.

I am designing a 30W guitar amp and needed to know what signal level is needed from the pre-amp to generate full power from this board. This review is based on what I discovered on the test bench using a signal generator (sine wave at 1kHz) and an oscilloscope. I have not connected this power amp board to a speaker - yet.Power supply - 24V, 4AVoltage gain of this board is about 32dB (Av ~ 40), so 0.4Vrms is all that is needed to drive 30W into an 8-ohm load. That same input will push 60W into 4-ohms. At rated output power, the output wave looked clean when compared to the input. I did increase the input level to the point where the output started to clip - limited by the power supply voltage. This happened somewhere around 33-34 watts into 8-ohms.Make sure that your power supply is up to the task in both voltage and current capability. 60W into 4-ohms needs a 24V supply that can put out almost 4A. 30W into 8-ohms needs the same voltage but 1/2 the current. Anything less in voltage or current capability of your power supply will limit the power output of this board.You would be surprised just how loud 30W can be.