some crap-ass pyramid super blue's. I KNOW they're not great subs by ANY stretch, but they were free and in great condition. Back in the day, this 1 dude had 2 of the 15"s, in a box with round ports, and it actually was kinda loud, but didn't hit the lows on a song like Late Nite Tip by 3-6. A song like Where's Da Bud hit pretty loud in that box though. I wanted to make it a vent port that would hit some lows loud