I have two of the Monoprice 12" subs for the home theater. Got them a few years ago and I'm surprised the police haven't showed despite living in the boonies. Very impressive. I recently tried one on Houdini...the 12" was just too much, plus it's huge. I had noticed Monoprice came out with a slimline active 8" ported. Much better cosmetically. Acoustically?...spot on for a pin. $100 with shipping Hooked it up to AS a couple of days ago. Wow, what a difference. I made simple circuit (just a resistive voltage divider) to run into the sub's "line in" since I tapped off of the AS woofer (that is still connected). That way I could set the sub volume independently from the Stern woofer.