The specs for the OnePI calls for a port of 2.5" diametre. For appearance sake, I'd like to use a plastic port ring and tube, but 2.5" is very hard to find, while 2" and 3" tubes are everywhere.

Increasing port diametre to 3" would mean a port length of approx. 5.5". Way too long for a front baffle port with cabinet depth of only 8". Not too keen on relocating the port opening to top of cabinet.

Reduce port diametre to 2" would increase air speed out the port to about 0.18 of mach. Is this number too high?

Any other options that I should consider?

Thanks,
gar.