Just wanted to run these calculations by some of the more seasoned enclosure builders.
Scenario:
2 Fi Audio "Halcyon" 15"s. These are massive. I consulted with Fi and they recommended tuning to 32 Hz with 60 sq in of port area and 4 cu ft of enclosure (each).
Running the #s I come up with:
8 cu ft box ( overall, I realize I have to account for displacement of the ports and the subs).
4 6" aero ports ( pi r 2 = 3.14 x 9 = 28.26 sq in per 6" port.....so 4 x 28.26 = 113 sq in of port area). While I realize this is LESS than the recommended 120 sq in of port by Fi, running the scenario through Triticum's spreadsheet it results in a minimum of 109 sq in of port required. Running the #s through the PSP aero port length calculator I come up with a length 33.81 inches per aero port.
Since all car audio systems are an exercise in tradeoffs and compromise here are my questions:
Am I correct in my math/calculations? In other words, I come up with need 4 6" aero ports at 33.81 inchs per port.
Should I fret over the missing 7 sq inches (if I go with this plan of 4 6" ports) or should I consider adding a 5th 6" port? <--I'm running out of real estate which is why I'm hung up on 4 6" ports.
Reading the forum, it looks like I can introduce a bend of 90 degrees or less in each port with no ill effects. True? Ideally I'd need close to a 90 bend in each port so I can make this fit (the box is going to be about 16" wide, subs will be "elevated" via the use of fiberglass to make this all fit firing up).
Seems like my port lengths are VERY long, but then again this is a lot of cone area with a fairly low tuning frequency. Thoughts?