Those using the Rythmik 380 Amp and you "MOUNTED" it on your sub, did you use the Rythmik website "Cut Out dimensions"???
Just want to be "absolutly sure" they are correct before cutting. It's going into a finished sub that is going to be very difficult to cut it's opening larger due to the design!
I emailed Brian of Rythmik and mentioned that the cut out dimensions are not in the 380's nice 4-page manual. He thanked me for bring this to his attention. He also said, he's on the conservitive side "slightly" for the cut out dimensions at his web site.
Thanks Geoff
Edit: I went with 9-1/4 by 11-1/4 for the cutout. It fits fine but more play room than I like to see when I mount a plate amp. Brians on site cutout measurments would make for a tighter fit. Next R-350 amp mount, I will go with his dimensions instead.