What is your source? Analog from a DAC? TOSLINK? USB?
I run a LXmini + sub setup with NC252MPs, probably overkill but they are low noise and have plenty of power on tap. I also use a bridged NC252MP on each of my subs.
One of the cheapest ways to implement a LXmini from a DSP / amplifier standpoint is the
HifiBerry Beocreate. Power ratings are a bit unclear on the Hifiberry website but from my bench testing higher power channels are 30 W @ 8 ohms and 60 W @ 4 ohms and lower power channels are 30 W @ both 4 and 8 ohms, all ratings are at 0.2% THD+N. Definitely not tons of power but does OK with the LXmini. Hifiberry OS is very easy to use.
As mentioned above, the other REALLY cheap way to do it would be an AVR feed by the HDMI output of a RPi4 running CamillaDSP. If you need something more than a streaming input you can add a digital input HAT or even a 2X4HD for the TOSLINK / analog input.
I also second the recommendation of adding subwoofers, definitely a much better experience with subwoofers.
Michael