Time to say goodbye to the IB. I've been having to go into the crawlspace much more than anticipated and it was becoming too inconvenient. So the IB's are getting replaced by 2 ported subs.
7 cubes, two 4" ports, 19hz tuned
It was not fun working outside below freezing! MDF dust literally froze to the ground and had to take a shovel to it to get it off. Moving the subs in and out repeatedly was not fun either.
Here's a look at the insides. Assembled using wood glue + pocket screws. PL premium on the last layer. 4" mineral wool behind the driver covered with batting to prevent fibers from flying out the port. 1.5" rigid fiberglass everywhere else. This stuff was nice in that it had a black surface that can be left exposed. The insulation took up quite a bit of volume so I'm curious where the final tune will net out, still have to measure that.
The finished product, and yes, I know they are ugly. But they are going behind my screen wall never to be seen again.
So far, I've only listened to them near field with music and they sound great. Nice, tight, punchy with accurate tonality. I can hear notes, not just boom. I hope they play just as nice behind the screen wall.
Next up, fire up REW, play around with final positioning, bass traps, and eq.