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  #1  
Old 06-04-2013, 09:30 PM
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Default It's built : the verdict is in




6th order Tuned 34Hz rear 58Hz front

dd M3b at 1.6Ohm (1500-1800rms)?

Custom (JB Welded) 10"



This thing is a low end monster! Plays WAY lower than my vented DC 12's (yes, I know, the box has a lot to do with it).
Taking near full tilt from the dd M3b at 1.6

Just not impressed by the lack of "punch" on Metallica-like bass. Rolls out the low notes like a champ. Overall happy.

On to the next project. Sell my DC's and wait for the new Zv4 18's?

Thanks for the input on the box. All good advice.
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Old 06-04-2013, 09:38 PM
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Very cool and great way to fit a 6th order
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Old 06-04-2013, 09:38 PM
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Sweet.

Curious though... how did you arrive at the chamber volumes? Seems backwards to me. And may be why it's lacking a bit in the FR.
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Old 06-04-2013, 10:05 PM
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Volume was easy (for me). Take the area of the "end pieces" using trapezoid formula (b1+b2)/2 * H. Use that multiplied times width of section to find volume.

On vented side use same formula except you need to subtract your vents: vent 1 is an isosceles triangular prism. Take the area of the triangle multiplied times the length of the port. Vent 2 is a simple cylinder Pi x radius^2 x height.

Geometry teacher!! Who ever said we wouldn't use this stuff in "real" life.

lol
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Old 06-04-2013, 10:08 PM
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think he meant why did you go with such volume per chamber not HOW you figured it out
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Old 06-04-2013, 10:09 PM
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Quote:
Originally Posted by stssilverado View Post
Volume was easy (for me). Take the area of the "end pieces" using trapezoid formula (b1+b2)/2 * H. Use that multiplied times width of section to find volume.

On vented side use same formula except you need to subtract your vents: vent 1 is an isosceles triangular prism. Take the area of the triangle multiplied times the length of the port. Vent 2 is a simple cylinder Pi x radius^2 x height.

Geometry teacher!! Who ever said we wouldn't use this stuff in "real" life.

lol
Lmao. I didn't mean "how did you calculate" the volumes. I meant... why did you use 1cf rear and 1.8cf front?
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Old 06-04-2013, 10:22 PM
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Looks good! What are you doing to cross it over? Might want to play with that a bit to see if you can get some of the "punch" back into it.
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Old 06-04-2013, 10:26 PM
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Lmao. I didn't mean "how did you calculate" the volumes. I meant... why did you use 1cf rear and 1.8cf front?


I thought that was an odd question from you.

Anyways, I played with the estimated specs on WINISD to get the best balance of lows and highs to get the flattest possible curve. Had peaks at 35 Hz and 57Hz of 7+ DB had a dip in the middle and never dropped below +2.

My first 6th attempt, not to dissappointed.
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Old 06-04-2013, 10:29 PM
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Originally Posted by stssilverado View Post


I thought that was an odd question from you.

Anyways, I played with the estimated specs on WINISD to get the best balance of lows and highs to get the flattest possible curve. Had peaks at 35 Hz and 57Hz of 7+ DB had a dip in the middle and never dropped below +2.

My first 6th attempt, not to dissappointed.
That's awesome. Post up a screen shot of the FR if you have it saved.
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Old 06-04-2013, 10:35 PM
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P.S.- this is a crappy pic, but here's mine when I did a similar one. Those aren't 45's. Those are the dual triangle ports for the rear chamber.

Lvl5 12, btw. That box got nasty.

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