Amplifier advice

I'm looking for a small relatively inexpensive 2.1 channel amp to power a pair of small speakers and a small sub. The speakers are rated at 50 watts and the sub 100 watts.

If there's an inexpensive stereo amp and amp for the sub that would work as well.

I'd like to keep cost under $100 if possible and it needs to be relatively simple to operate.

This is going to be for a PC at work used to show a video.

EDIT:

I found a subwoofer amp that might work.

https://www.amazon.com/Subwoofer-Amplifier-Receiver-Integrated-Audio/dp/B07942M4MC/

I'd need a stereo amp though with a variable line output.

This one has a line output, but not sure if it's controlled by the volume control.

https://www.amazon.com/Saiyin-Amplifier-Bluetooth-Integrated-Headphone/dp/B0CJ4ZY7SX
 
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If you ever want to go hi-fi with a 2.1 system , refine to a good class AB 60W+ amp for the satellites and
a 200W+ class D for the sub.
I use a tweaked Sonance 260 AB (70 x 2) for my small Polks and am Building a uPC400 (300+W) for my "hungry sub".

OS
 
The speakers aren't really worth spending a lot on the amplification.

Both are from home theatre in a box type systems I believe.

The onkyo sound decent and will be better with a 12dB crossover.

The Sony sub is ok but not great below about 40Hz.
 
The only thing I don't like about the amp is there's no high pass crossover for the main speakers.

It would have been easy to implement though only requiring a few components and a switch to bypass it when the sub isn't being used.

Here's the setup. It will sound better once the Onkyo speakers get proper 12dB/octave crossovers installed. 20Hz bass response is not required though as the video doesn't have extreme low bass but has some bass below 60Hz.

Resizer_17269673639211.jpeg
 
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