1. ## Help calculating port length and size?

I have 2 Kicker CVR 10's in a sealed box right now. The box manufacturer said it was 0.85ft3 for each sub. In actuallity, the box is one big 1.7ft3 sealed box. I have a rf amp giving each sub between 350-375 watts. I am thinking about porting the box. Should I use one port for the whole box, or 2 for each side/sub? I would like to tune it to 30hz and run either 2" or 4" round ports. I played around with some formulas, and came up with the numbers below:

1-2" port=4.1" length
2-2" ports=9.6" length
1-4" port=8.14" length
2-4" ports=19.214" length

Would 2" or 4" port/ports sound or perform better? Would any of these set-ups be louder or sound better than the sealed box I have now? I would rather have SQ over SPL.

2. ## Re: Help calculating port length and size?

I'd go with one 4" port

Two 2" ports isn't much port area and two 4" is a lot (for your volume)

3. ## Re: Help calculating port length and size?

Ok, forgive me! I am a total newb on ported enclosures! I was thinking either 1 4" in the middle of the box or 2 2" over each sub's "box". I think I might have to go with 2 2" ports though because the logical port location I can see isnt very wide. I'll look around the box and see if I can find a spot for 1 4" port.

4. ## Re: Help calculating port length and size?

1.7 For two 10” sub ported is going to be close (subtract the displacement of both subs and the total port volume)
Your going to loose .3 - .5 in total box volume
The smaller the box = the longer the port length (will it fit in your box)
A 4” port would have to be over 15” long
Your tuning frequency is to low for that small of an enclosure

You need more box

5. ## Re: Help calculating port length and size?

i know for 1.75 cubes and 35 Hz you need around 17" for a 4" aero...

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