Need help with SPL box

[theotherguy 10+ year member]

I am needing to get more SPL from my sub to be more competive in DB drag's. I have run 2 diffrent box calulaters on my sub and here's what they give me. 3.12 cubic feet ported.Does this sound right, speaker Q .5016 Elect. Q .5390 Mech Q 7.2317 Vas. 44L I have no spec's on X-MASS,but like 20-30 mm. Would 3.12 cubic feet be to much,the sub's rec. 1.5-2.0 cubic feet ported. I'm going to tune to like 50HZ,Would that be the best freq. for SPL.

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[wesl56 10+ year member]

what woof

 

[theotherguy 10+ year member]

Volfenhag ZX-4812...comp series. They realy do hit hard,even though there a off brand?

 

[killahbean 10+ year member]

You're going in the SPL lanes with a Volfenhag? have you gotten metered yet? What numbers u puttin up?

 

[theotherguy 10+ year member]

My volfenhag's poped 138.8 on the dash at a recient DB drag.

 

[killahbean 10+ year member]

thats not bad dont tune it that high though....maybe 40-45 hz I'm not really sure about your sub though....never heard opne before.....

 

[theotherguy 10+ year member]

Would 40-45 be for all out SPL comp's. I will have a diffrent box for daily driveing. I was happey with the 138.8 for my first time out with a box I designed and built my self with a pair of sub's that cost less than $200 delivered to my door. I was tuned at 27 HZ ...would a higher freq have hit a higher figure?

 

[blue93corsica 10+ year member]

ya, you do better at around the 40-45hz area then the 27, but the box is gonna sound like shit for daily driving which is why its good that you have another one

 

[Trixter 10+ year member]

all bs aside, you should find you car's resonant freq. and have the box peak at that. all cars are different. usually 45-55 and thats where the recommendations for the 40-45 tuning freq. comes in. my cavalier' resonant freq. is unusually low, about 38-40. make the box large and have a lot of port area. there are a ton of tips and trick to get your spl up. but with out knowing you exact set up its a little hard to give suggestions.

playing with off brads can be fun. i know a guy that was doing mid 140's with 4 10" roadgears.

 

[jeepintn 10+ year member]

all bs aside, you should find you car's resonant freq. and have the box peak at that. all cars are different. usually 45-55 and thats where the recommendations for the 40-45 tuning freq. comes in. my cavalier' resonant freq. is unusually low, about 38-40. make the box large and have a lot of port area. there are a ton of tips and trick to get your spl up. but with out knowing you exact set up its a little hard to give suggestions.
playing with off brads can be fun. i know a guy that was doing mid 140's with 4 10" roadgears.

x2, sometimes u can do a search and find the frequency easily. what kinda car?

 

[wesl56 10+ year member]

i know a guy that was doing mid 140's with 4 10" roadgears.

thats impressive... lol how long did they last tho?

 

[mikeyboc 10+ year member]

thats impressive... lol how long did they last tho?

I remember seeing someone toss up close to 150 with 6 Wallymart 12's (or something along those lines). He didn't care if they blew because they were only $25 or so to replace. It was a great vid too.

 

[Trixter 10+ year member]

thats impressive... lol how long did they last tho?

not sure didn't stick around that long..like dude above me says....they were cheap, i don't belive he cared.

a wise man once said 10% product, 90% install...this is true.

 

[theotherguy 10+ year member]

x2, sometimes u can do a search and find the frequency easily. what kinda car?

My car is a 95 pontiac firebird. How would I find my car's peak freq?

 

[theotherguy 10+ year member]

thats impressive... lol how long did they last tho?

I have had them in 3 car's and owned for like 2 year's. Still sound like new BABY!