Xdq_21X Posted November 9, 2016 Report Share Posted November 9, 2016 i designed a 3 chamber 4th order bandpass box design for 2 PSI-8's, dual 4 ohm, 600watt rms each, powered by Hifonics Brutus BRX1100.1D amp, wired to 1 ohm, i need help with a port for the ported area, i want a aero port tuned to 45hz....the dimensions are: Outside dimensions: Depth: 20in Width: 31in Height: 12in Inside dimensions: Depth: 20in Width: 31in Height: 10.5in Both sealed inside chamber dimensions: Depth: 20in Width: 7in Height: 10.5in 0.85ft3 Ported area inside dimensions: Depth: 20in Width: 14in Height: 10.5in i want to tune it to 45hz but i need help with the aero port i dont know how to calculate what size and length i need. Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted November 9, 2016 Report Share Posted November 9, 2016 You will want at least a 6" aero port. If you could get two 5" ports, that would be a lot better. Two 5" ports would need to be about 27" long to tune to 45 Hz. A single 6" port would need to be about 17.75" long. Whatever you do, I'd suggest making the port removable or otherwise adjustable so you can tweak the tuning once you get the box in the vehicle and playing. Tuning calculators aren't an exact science and you may want to shift the pass band up or down to get the frequency response you are looking for. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
Xdq_21X Posted November 9, 2016 Author Report Share Posted November 9, 2016 You will want at least a 6" aero port. If you could get two 5" ports, that would be a lot better. Two 5" ports would need to be about 27" long to tune to 45 Hz. A single 6" port would need to be about 17.75" long. Whatever you do, I'd suggest making the port removable or otherwise adjustable so you can tweak the tuning once you get the box in the vehicle and playing. Tuning calculators aren't an exact science and you may want to shift the pass band up or down to get the frequency response you are looking for. dang...i dont have room for that size port in my trunk...any other options? could i add more ports and shrink the length or something? Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted November 9, 2016 Report Share Posted November 9, 2016 dang...i dont have room for that size port in my trunk...any other options? could i add more ports and shrink the length or something? No, that's not how it works. More ports or more port area mean the port has to be longer to keep tuning the same. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
Xdq_21X Posted November 9, 2016 Author Report Share Posted November 9, 2016 gotcha how about 4inch diameter port at around 8.2 inches? Link to comment Share on other sites More sharing options...
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