SPL2K
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Posts posted by SPL2K
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Ok one more question the 1:9 port ratio, could someone clarify this?
That just means never have more port area than cone area.
Example: If you have 1000 square inches of cone area then dont go over 900 square inches of port area.
If you have (4 round 15's) 706.5 square inches of cone area then dont have more than 635.85 square inches of port area.
[RANT]I think most of these "theories" and "general rule of thumbs" are BS anyway. Most of them encourage you to either make the box too big, have too much port area, or tune it too low.
When you build an average of 40 to 50 ported boxes per month for 5 or 6 years straight you get a pretty good idea of what works the best and what is just impractical.[/RANT]
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what should i tune it to ?? 35-38?? any port calculaters you recomend
what kind of music do you listen to mostly?
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If you really didnt have room for a port, i would give up a sub to make room for a port.
......But you have plenty of room in that truck for your 2 15's and a port. Fire the 2 15's forward and the port out the passenger end of the box
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If I use 3/4" mdf, should I double up the baffle?
no...single layer is fine. Just use a peice of 2X4 from the baffle to the back of the box in the center.
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how much power were giving those comps?? ive heard storys of 2 gettin in the 140's....but i have 2 12"s and dont see that being possible
I could do a 154 with 2 comp 12's.....
.....in a crx.
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who is all going? its april 11-13
im trying but i also want to be there for Desert Storm. I dont know if i'll make both.
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90% or more with the top up, I live in WV so its not real warm for long. I would like it to be loud for top up and down but mostly with top UP.
if thats the case then you will be safe tuning a little bit lower. (i would say 38-39) but expect to lose 75% of low bass once you "drop the top".
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wait......
how much time is spent with the top up / down?
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Rap
40-41
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ive never won any audio comp ever and can get product from many companies from just builds and installs.
thats great but most companies wont hand out amps / subs / batts / video / etc for free to just anyone without seeing what they are capable of with their product.
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No he had a 91 cadillac sedan deville it gets quite loud for a single 12" but the lows were decent not great. So what tuning would you recommend?
what kind of music do you listen to mostly?
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I thought shallow boxes were bad for woofers?
Kills output and SQ?
thats incorrect.
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Win a couple of world championships out of your own pocket first. Then the sponsorships will come.
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Lose the chrome gas door.
24" red color matched wheels with a polished lip.
4 12's or 3 15's in a nice red fiberglass box below the window line.
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question am i wasting my time trying to get a convertible loud...as i have never seen a loud soft top.
you can get it loud but you have to tune higher.
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Really? My brothers box was tuned to 40hz just didnt seem like it hit the lows, but hey I'm not expert on ported boxes.
did your brother have a convertible also?
Its impossible to get decent low bass in a convertible.
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I have a convertible
I thought about 32-36hz
You better tune it to ATLEAST 40 or you wont even know its back there with the top down.
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definately box 1
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ok so make sure i've got this right. If i go with a 2 or so net cubic foot box, after i add on port, sub, and bracing displacements it shouldn't be over 3 cubes total correct? And that 20 square inches each? is that for sub or per cubic foot.
using your dimensions... 35.75W X 11T X 25D you've got 4.42 cu.ft.
Build the box that size with the 4 8's along the front of the box with a slot port along the bottom right below them.
The vent should be 34.25W X 1.25T X 18L. That will tune around 37. Divide the center of the vent with a strip of 3/4 for a brace.
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they will fit touching across the 35 3/4 face.
That will leave 1.5 x 33 prob just enough vent area for them.
i recommend 400-450 rms of clean power.
tuned to 37hz
agreed!
.....but i would tune it around 40 or 41 so port length doesnt eat up too much airspace and because they are 8's.
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the 2 cvr's would be louder but if you are wanting 2 15's, then why not just get another DD 3515?
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Did you build it yet?
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ok so as big as possible,
Not if you want SPL.
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Nothing in the corners, no resin, and no bracing unless you are using more than 2000 watts. Maybe 1 2X4 from front to back between the 2 subs.
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Box Design, I Need Asap
in Subwoofers / Enclosures
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Hello???