can someone double check these box specs?

[ktraughb 10+ year member]

I will be building an enclosure for two 15s. Separate chambers. Plan for 3 cubic feet after displacement and tuning right around 40 Hz. If I use a single 6 inch aero per chamber with actual inner diameter about 5.88, I calculate about 9 inches port length for the 41 Hz tuning. Can someone help me out and confirm or fix my calculations? Thanks in advance. This box will be geared more toward Spl.

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[Buck 5,000+ posts]

Winisd says 9.92 for 41 hz

 

[RAM_Designs 5,000+ posts]

Winisd says 9.92 for 41 hz

Indeed.

 

[ktraughb 10+ year member]

Awesome. Thanks guys. I figured I was off a bit.

 

[Buck 5,000+ posts]

Remember to make the port 1" longer if using flares. You lose .5" per flare of effective port length.

 

[ktraughb 10+ year member]

Thanks. That was actually another question of mine. I rarely build boxes with aero style ports and couldn't remember how much length the flares would account for. I've always been a die hard slot port builder but I have built a couple very loud aero enclosures so im going to give it another try.

 

[Buck 5,000+ posts]

Aeros can be loud. It's just all in how it's designed.