Phenomenal, stupendous, and astounding with super tight bass with the useful upgrades when compared to the older Dynamo subs!!! The apps work flawlessly and at this price point you cannot go wrong, plus it marries brilliantly with my Vision X. ARC setting via the app is spot on and I recommend using an iOS mic over an Android cell phone...etc. Don't forget to download the other ML app so you can use it for the subs settings. Bluetooth, and there's plenty of parameters to play with according to how you like the sub to sound, also change settings on the fly from your couch, lovely! These new X model subs are really a lot better than the Dynamo 700W I had, hands down.