Seyzar18 Posted April 1, 2016 Author Report Posted April 1, 2016 If I go to 28hz it's 6.54 inches with aero
afrakes Posted April 1, 2016 Report Posted April 1, 2016 What size aero though? Vehicle: 2014 GMC Sierra 2500HD WT Head Unit: Pioneer DEH- Mids/Highs: Focal Integration ISC 165’s (front) Subs/Amps: TBD
ShadeTreeMechanic Posted April 2, 2016 Report Posted April 2, 2016 What amp are you going with? The amount of power will determine what the cross section of your port will need to be. The length will be the result of cross section and tuning frequency. 91 C350 Centurion conversion ( Four Door One Ton Bronco) 250A Alternator (Second Alternator Coming Soon) G65 AGM Up Front / Two G31 AGM in Back Pioneer 80PRS CT Sounds AT125.2 / CT Sounds 6.5 Strato Pro component Front Stage CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill FSD 5000D 1/2 ohm (SoundQubed 7k Coming Soon) Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon)
Triticum Agricolam Posted April 2, 2016 Report Posted April 2, 2016 OK, well lets assume you are going to do like most and put a bit more than RMS power to those subs. Say 2,200 watts. So 2,200 watts into a ~2.7 cube box at 39 Hz I'd use 50 sq in of port area. That should keep your port velocity at or below 30 m/sec. FYI, wouldn't try putting more than 2200 watts to those four subs are you will likely run into excursion issues. A lower tuning would help, but your port will get to be pretty long. "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:
ShadeTreeMechanic Posted April 2, 2016 Report Posted April 2, 2016 So 50 sqin would be an 8 inch aero? Or could a 6 inch work because it is flared? 91 C350 Centurion conversion ( Four Door One Ton Bronco) 250A Alternator (Second Alternator Coming Soon) G65 AGM Up Front / Two G31 AGM in Back Pioneer 80PRS CT Sounds AT125.2 / CT Sounds 6.5 Strato Pro component Front Stage CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill FSD 5000D 1/2 ohm (SoundQubed 7k Coming Soon) Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon)
afrakes Posted April 4, 2016 Report Posted April 4, 2016 8 in aero is 50 square inches roughly. 6 in aero is only 28ish. I'd go with the 8. Flares don't make a difference when determining port area because the main chamber the air passes through is where you take your measurements from iirc. Vehicle: 2014 GMC Sierra 2500HD WT Head Unit: Pioneer DEH- Mids/Highs: Focal Integration ISC 165’s (front) Subs/Amps: TBD
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