Me and the family are into doing karaoke at home and currently have a speaker claiming to be 600 Watts running to our Sony Bravia TV. We then play karaoke songs via YouTube from my phone via the square button to cast to the TV so all the sounds of both you singing and the music come through this massive speaker I've set up just for when I do the karaoke.
Anyway, I want to go the next step up now and was interested in buying a sound mixer like one of these.

https://www.amazon.co.uk/dp/B00I2J4V...exicancandy-21

Would anyone know if it would add a better sound to the speaker I already have which has Base. Treble. Mic echo already built into it?
Which budget mixer with effects would anyone recommend? To be honest I'm looking to go second hand not new?