Aeroport size for my enclosure, Phoenix 15 & Alpine R 15 - pls help

[DAN831111]

Ok so my box is 2.9 cubes after displacement of Alpine Type R Gen1 15 and 2 x 4 inch Aeroports tuned to 34hz. Is 2 x 4 inch Aeroports enough? As I will be making them out PVC pipe im limited in  diameter choices, its 4 inch or 2 inch PVC pipe. will 2 x 4 inch be enough and not cause chuffing?

Also I will be using the same box for my Phoenix Gold Ti215D4 15" woofer (not sure of displacement, cant find on internet, but it would be a bit less than the Alpine R 15), will the 2 x 4" aeroports be enough for this sub also or do i need to go with a 3rd 4" aero and if so how would this affect it when i put the alpine sub back in?

 

Maybe Triticum Agricolam can chime in if hes still on here? Anybody who knows though pls reply.

 

Cheers.

[Joe X]

Those are entry level subs and will work on a single 6" port, flared if possible. Better than two 4"s which combined port area is less than one 6".

 

[DAN831111]

cheers for the reply Joe X, I end up going with 2 x 4" (one on either side, with the slightly higher one on the driver side) so I can even out the boom, i found having the ports on one side (in my old box) made it heaps louder on one side of the car, drives me nuts (feels lop-sided). Chatgpt, did port noise checking with SD & Xmax.

[Joe X]

SD x Xmax only gives you the volume displaced, you can't calculate port airspeed from those two alone, you need to calculate volume velocity which is a complex function dependent on frequency and the operating conditions of the driver that include signal,  power, the  box itself + others, that's why you use modeling software, do not rely too much on chatgpt which still is a stone age form of AI, it is very possible that AI will kill us all but not just yet.