View Full Version : Port Size help

03-18-2003, 01:13 AM
OK, I got a free sub box, and I filled it with 2 Cerwin Vega 104s. However, it is sealed, and I decided I wanna port it. I have a pic of it showing all dimensions; can you guys please help me figure out the port size for each halve of the box? BTW, it is built with 3/4 inch MDF.

Oh, and another question - I don't know exactly what frequency it would be best to tune the box to - on the Cerwin site, all tuning they did was at 35hz, so I am guessing I should do the same.

THanks for your help


03-18-2003, 01:17 AM
Oh BTW, if it is needed, I am running a JBL 600 Watt amp at 300x2 at 2 ohms.

03-18-2003, 02:38 AM
If I'm getting your measurment right you've got 2.89 cubes before speaker and port displacement. So 1.45 for each sub. I'd try a 4 in port about 14 inches long for each chamber. If you don't like the sound of that, cut an inch off at a time until it sounds good to you

03-18-2003, 10:31 PM
I tried it in WinISD, 1 side at a time. I got 1.699 cubes. How about 2 2 inch circular ports, each about 6.5 inches long? Or is it better to use 1 port?