Thse things are an amazing deal. Let me just start by saying that my main system subs are dual svs pb 4000's paired with some bowers and wilkins cm 8 towers cm center and cm bookshelves for my Rear channels so I am no stranger to excellent sound quality. I bought dual m 10's for a secondary system that I have for a gaming system paired with some emotiva t2 + towers and matching center and rears . I am using an onkyo rz830 which is thx certified so I thought the thx m 10's would suffice. The subs gloss finish was impressive and I was pleased to see balanced connections in back. I connected them and left them playing all day while I was at work to break them in. I set the onkyo to thx mode as well as the subs and played my first demo. I was VERY impressed. The race scene from ready player one was my first demo and these little guys gave me some effortless clean bass at low and refrence level volumes. I mean they gave me 80% of what my pb 4000's give me at less than half the price. I am getting down to 17hz in my space. The pbs are more powerful and have more output but they also cost 2500 a piece. I actually think the m 10s give out a more neutral response to be frank. Next step will be the v 12 . SVS LOOK OUT , seems like monoprice is coming for you! Great job monoprice!! In short if ur looking for a great sub and value don't hesitate these are a phenomenal deal. Also just a note.. my calibration set these subs very low on my receiver and I had to turn up the level in the receiver a bit,this also happened with my svs so this is not anything negative about the m 10.