hz caliber

I would say anywhere from 32-35hz. I personally have my ported box to 41hz, but it is more for SQ not SPL."People with mullets live 40% longer"   - Ricky Bobby

41 Hz is a bit high for SQ, it's more toward SPL imo.Shaking The Neighborhood

killer sonata wrote: I would say anywhere from 32-35hz. .

like I said before lol.

How would a higher frequency be on the side of SPL?

"People with mullets live 40% longer"   - Ricky Bobby

most true SPL boxes are tuned to match the cabin gain to meet the resonant frequency of a vehicle. I.E    Our civic really likes 56-58hz for SPL use. But we typically have a cabin gain of 8-10hz based on power, box position, and tempature and humidity so we tune our boxes to approx 45hz to achieve maximum SPL This is the definition of SPL use for competition use.2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR

2007 USACI World Champion

2007 World Record

2006 USACI Finals 2nd Place

back to the topic I would tune the box to 32-36hz with a 2-2.5 inch wide port approx 14-15 inches long by (x) deep to achieve tuning based on box size2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR

2007 USACI World Champion

2007 World Record

2006 USACI Finals 2nd Place

See, I have always tuned low, my last 3 boxes were under 30 hz, but for customers I make all their boxes tuned to about 31-33 hzdouble-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer