View Full Version : round port question

06-10-2008, 10:54 PM
ok I have a alpine type x ten

if the box was 1.5 cubes I want it tuned to 35 hz is 9.17in on a 3in flared port right

just seems small

06-11-2008, 06:41 AM

06-12-2008, 09:05 AM
Ports to small. I used the 3" recommended from the Alpine site for my 10" Type R and I had a lot of port noise. I changed to a 4 inch and adjusted the length and am pleased with the result.

Using the Calculator here http://www.carstereo.com/help/Articles.cfm?id=31

I came up with a port length of 15.5" for a 4" port. The calc on top recommended a 6" port for your sub but the port length would have to be 37". You will have a hard time getting all that port in your box.

Remember you have to add the port displacement and the woofers displacement to the 1.5 cubes so you have the correct final volume for your enclosure.

06-12-2008, 09:08 AM
You could also play with the calculator and put yourself in a square/rectangle port. May be a little easier to incorporate that into your box.