Sub10 : Unfortunately not very good

I bought this sub recently but I am sorry to say that I am about to return it.

Sub produces what sounds like a continuous 60hz mains hum which is prevalent and audible. This happens from when the unit is turned on, with nothing plugged into, and/or connected to speakers. This renders the unit unusable for most studio applications as you will hear the hum clearly when there is silence. Also I found the sound, even at low levels, to be a little fuzzy/distorted. The unit is otherwise sturdy and well built, There is a LOT of power in this sub, and if you are buying it for home stereo use it might be ok for your needs but I could not recommend this particular unit for mixing/mastering as the hum will drive you nuts and there is no cross-over as such, but rather a low-pass filter. I have instead opted for the Prodipe Pro 10s at 100euro more, so I will see how that one fares out.