How to build powerful mini amplify that uses bluetooth with USB model which can work with big speakers systems and can create distortion.

 

With PCB, components, solder and soldering iron.

 

Price of this amplifier is $ 27.99
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S-299 4*400W 4.1CH Mini Power Amplifier Audio Karaoke
Home Theater Amplifiers Home Car Bluetooth Wireless Amplifier USB/SD AUX

 

These normally come with a Switching-Power-Supply capable of less than ~100-Watts,
( but usually closer to ~60-Watts or even less ).

Here is a ~125-Watts per channel Amp that can actually smoke some Speakers permanently.

If You really want some Distortion,
I suggest that You create that Distortion with a Guitar-Effects-Pedal first,
then send that Distorted-Signal to the Amplifier.

Don't over-drive the Amplifier, unless it's a Tube-Amp that is designed for that type of abuse.
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There are MANY audio power amplifier circuits on the "Schematicsforfree" website, and no malware or obnoxious advertising.
There is also a section of guitar effects circuits, which includes distortion.
I find that 1600 watt amplifier shown in post #3 to be rather difficult to accept as being a legitimate product and not a simple fraud.

 

The 1600-Watt Amp is simply following the standard
Chinese-Power-Rating method of adding 2 or more zeros to the end of the Rated-Power-figure.

It really will produce 1600-Watts of heat if You hit with a big enough Laser-Beam, no really, I'm not kidding !!!
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Question!! Which 1600 watt power amp is LQC referencing in post #6???If it is the one shown in the ad in post #3, that might be the max IPP rating. (IPP= Instant Peak Power.) That is, the maximum power the can be delivered for one cycle. With whatever level of drive needed to produce it.

 

That's right when all the Power-Transistors go ......... "PAK".........
and the Blue-Smoke comes out all over the place !!!!
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Any actual amplifier that can actually deliver 1600 watts of audio power will not be a " powerful mini amplify that uses bluetooth with USB model" unless it is nearly 100% efficient. The problem then will be distortion in excess of what the TS is probably planning on having.