The Fosi MC101 is a stereo amplifier that offers the user tone control options not seen often in the small amplifier market segment. Fosi Audio provided the unit evaluated in this review. The MC101 is listed for $79.99 on the Fosi Audio website.
In the box:
The amplifier ships with a Bluetooth...
I have tested it. The unit has 3.5mm input and output. The loudness button does work. You can adjust the low, mid and high frequency. I used my tablet as the source and dac. For the price, I know of no other device with such flexibility.