Not to be a 'Debbie Downer' here, but I bought one of these on sale a few months ago too. It's output is really weak compared to any other sub I've bought in the past. I didn't expect much for the price as I only wanted this to add a bit of bass to a spare 5.1 system I had lying around, but the bass from my main drivers overpowered these handily. (and they aren't anything to brag about) Even at $20, it wasn't worth it to me as this sub added little to no benefit.

Maybe in a pinball application it would provide some use as they really don't have bass to begin with. (outside of AC/DC, I'm guessing) Good luck to all that try this, but don't expect too much & you may not be disappointed.

You're probably correct, especially with this application. (And after all, what's $20 bucks, right?)

I attempted to use for movie / music purposes on a spare system and that's probably why it was so muted. I personally use 300w Polk subs on six of my pinball machines and they really pump out the bass! (but they're nowhere near $20 bucks, so it's not a cheap alternative)

Boogies - More like $280 cheaper! They are $300 per sub w/ 8" drivers. (@ Best Buy also) But your point stands, you save BIG money with the Insignia / Rockfish units. Not much to lose @ $20 bucks a pop!