(2) Fi Audio BTL 15 Neo enclosure - Car Audio Classifieds!
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  #1  
Old 11-28-2016, 09:31 PM
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Default (2) Fi Audio BTL 15 Neo enclosure

I am building an enclosure for two 15" BTL Neo subwoofers, D1. The t/s specs from Fi are not jiving Bass Box 6. I want to double check with you all that I have a good design.

Goal: Ground pounder, musical enclosure. I have a Twisted Sounds 2.8k, love this amp. It is a solid 3.5kw amp.

Enclosure design:
  • 7 cubes net
  • tuned to 32hz
  • 120 inches of vent area (20x6")

Is the vent mach in-check with this design? Would you recommend anything different?

BTW this is a trunk build, external port through rear deck.
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Old 11-28-2016, 10:52 PM
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I came across this post on another forum that I modified.

Small's formula

dv = 39.37 (fb x Vd)^1/2

dv= minimum port diameter of vent in inches

fb= box tuning frequency in hertz

vd= cone displacement in cubic meters (one way xmax in meters times cone area in meters)

for one BTL Neo 15

xmax= .034 meters

sd= .018 meters^2

tuning= 32 hertz (per you)

dv= 39.37 (32 x .034 x .081) ^1/2

dv= 39.37 (.088128)^1/2

dv= 39.37 (.29686)

dv= 11.68737 inch diameter port per sub

dv= 107.28 square inches

for two 15's you need (2)dv. So you need 214.56 square inches of port.

Is that correct?
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Old 11-28-2016, 11:39 PM
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Tuned to 33hz with 214 sq inches of port, external port through the rear deck will extend out the window into the ozone layer.
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Old 11-29-2016, 07:42 AM
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Quote:
Originally Posted by stealth View Post
Tuned to 33hz with 214 sq inches of port, external port through the rear deck will extend out the window into the ozone layer.
That's what I'm saying
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Old 12-02-2016, 05:54 PM
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No one offered help but Fi did, quickly too.

I'll be building :
- 8 cubes
- 120 sq in port
- tune to 30-35 hz
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Old 12-02-2016, 06:19 PM
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Quote:
Originally Posted by edouble101 View Post
No one offered help but Fi did, quickly too.

I'll be building :
- 8 cubes
- 120 sq in port
- tune to 30-35 hz
They have recommendations on their website.
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Old 12-02-2016, 06:43 PM
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Quote:
Originally Posted by stealth View Post
They have recommendations on their website.
Yes they do
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