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Old 12-09-2012, 01:09 PM
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Default Check my 4th order specs?

REXS4 8's subs.

Figures are per pair of subs.

.97 sealed - 2.76 ported

48hz tuning - 4" x 2.399" port dimensions - 29.376 cubic inches of port volume.

Port seems awfully small to me. Would someone please check my numbers?
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Old 12-09-2012, 01:32 PM
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got a link to the T/S parameters?
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Old 12-09-2012, 02:07 PM
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http://reaudio.com/documents/rex_single_manual[2012].pdf
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Old 12-09-2012, 04:36 PM
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page not found
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Old 12-09-2012, 04:47 PM
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that sealed resonance is 40hz i believe
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Old 12-09-2012, 06:58 PM
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Quote:
Originally Posted by treylittlefield View Post
that sealed resonance is 40hz i believe
So tune the ported chamber to 40hz as well? Forgive me, this will be my first 4th order.
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Last edited by nicyousuckk; 12-09-2012 at 07:03 PM.
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Old 12-09-2012, 07:05 PM
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Quote:
Originally Posted by nicyousuckk View Post
So tune the ported chamber to 40hz as well? Forgive me, this will be my first 4th order.
you would, but thats way to low, get your resonance up, to about 47
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Old 12-09-2012, 07:10 PM
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.75 per pair=44hz
.5 per pair= 51 hz
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Old 12-09-2012, 07:38 PM
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Quote:
Originally Posted by treylittlefield View Post
.75 per pair=44hz
.5 per pair= 51 hz
So reduced sealed volume to ~.65 per pair and tune port to 47? How would I determine the resonance of a particular sealed volume? So I can match the port and sealed volume.
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Old 12-09-2012, 07:49 PM
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Quote:
Originally Posted by nicyousuckk View Post
So reduced sealed volume to ~.65 per pair and tune port to 47? How would I determine the resonance of a particular sealed volume? So I can match the port and sealed volume.

where did you read you had to match port and sealed volume? i read you need half of cone area in port area.

say 100sq in of cone area, you start with 50 sq in of port area

determine sealed resonance with a program. winiSD
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