Design Ideas for a Wall

[///M5 2,833]

Without knowing your listening tendencies, recommending tuning is premature IMO.

[MR_8 0]

Dude you arr like the coolest dad ever, i dont know any other dad that would build his son an amazing custom install, andthen build a walled up suv for himself, will you adopt me?!?!?! PLEASE!!!! i cant wait for this build log, i look up to you so much and am very excited to see all the Sundown equiptment!!! so dont keep us waiting too long, start chargin that credit card and writing those checks and emptying that bank account already!! good luck (father??) haha

[Duran 387]

I agree with Sean, generally anywhere between 30-35 Hz. does just great.

[onebadmonte 235]

One thought would be to keep the wall away from the listening position the distance of a quarter wave's length of it's tuning. In theory this will help in getting the full brunt of the enclosures tuning in vehicle. The baddest wall setup I ever heard was a hummer with 6 15" Havocs. It was 30 cubes tuned to 30Hz. The wall was behind the second row of seats. His port was the at the top, full width of the vehicle. I'm guessing 48" by 7". I talked with the fellow a bit and he mentioned the quarter wave length theory and what not. Needless to say the results proved he knew what he was doing. That was one bad sum-mama-bish!

[sefugi 166]

Without knowing your listening tendencies, recommending tuning is premature IMO.

I'm assuming you are referring to the type of music I listen too. I listen to all types of music and usually not one over another. If I choose the track instead of letting whatever is there play I would go to Eagles, Dave Matthews, or some Stanley Clark. I do listen to multiple songs suggested by my son and daughter as they ride with me quite often which could be anything from rap to country.

[sefugi 166]

Dude you arr like the coolest dad ever, i dont know any other dad that would build his son an amazing custom install, andthen build a walled up suv for himself, will you adopt me?!?!?! PLEASE!!!! i cant wait for this build log, i look up to you so much and am very excited to see all the Sundown equiptment!!! so dont keep us waiting too long, start chargin that credit card and writing those checks and emptying that bank account already!! good luck (father??) haha

Sorry I'm not looking for anymore borders at this time, got 2 foreign exchange students with us right now and when they leave in June I'll get a little releif on the $ spending.

As far as using the credit card, have made a deal with the wife all purchases will be cash as I get the money.

I do appreciate the "Koodos" though!

[sefugi 166]

I agree with Sean, generally anywhere between 30-35 Hz. does just great.

Playing with the design a little bit (wider by 1" and deeper by 1.5" and extending the port another 10") it should put me about 32Hz. That should be do-able without taking all the space in the rear for bats and such.

[sefugi 166]

One thought would be to keep the wall away from the listening position the distance of a quarter wave's length of it's tuning. In theory this will help in getting the full brunt of the enclosures tuning in vehicle. The baddest wall setup I ever heard was a hummer with 6 15" Havocs. It was 30 cubes tuned to 30Hz. The wall was behind the second row of seats. His port was the at the top, full width of the vehicle. I'm guessing 48" by 7". I talked with the fellow a bit and he mentioned the quarter wave length theory and what not. Needless to say the results proved he knew what he was doing. That was one bad sum-mama-bish!

Seems I have seen a page on the internet about using the distance and math to calculate this. Anyone have a link to this for me to study it?? The space behind the 2nd row seating is not that large as compared to other SUVs and I would have to rethink what I wanted to do with that modification. Deff. something to think about!

[onebadmonte 235]

Speed of sound/desired frequency/4=quarter wave length

ex. 13500"per sec./30Hz/4=112.5" quarter wave length

Here is a single post of a familiar car.

How it works: Sundown CRX

Good luck.

[sefugi 166]

Speed of sound/desired frequency/4=quarter wave length

ex. 13500"per sec./30Hz/4=112.5" quarter wave length

Here is a single post of a familiar car.

How it works: Sundown CRX

Good luck.

I think the article I saw for some reason referred to using a measurement from the back of the sub through the port to the winsheild. Does this sound correct or is it from the opening of the port?

[///M5 2,833]

If I choose the track instead of letting whatever is there play I would go to Eagles, Dave Matthews, or some Stanley Clark.

Higher tuning won't hurt you, but the linearity of tuning it slightly lower won't hurt either. 32-34Hz would be fine IMO.

Didn't expect the Stanley Clark, play the bass myself, nice.

[sefugi 166]

If I choose the track instead of letting whatever is there play I would go to Eagles, Dave Matthews, or some Stanley Clark.

Higher tuning won't hurt you, but the linearity of tuning it slightly lower won't hurt either. 32-34Hz would be fine IMO.

Didn't expect the Stanley Clark, play the bass myself, nice.

My older brother turned me on to Stanley Clark a few years back!! it!!

[onebadmonte 235]

I think the article I saw for some reason referred to using a measurement from the back of the sub through the port to the winsheild. Does this sound correct or is it from the opening of the port?

I'd say the port. The thread I linked describes the vehicle as a semi-bandpass enclosure with the ported box firing into a quarterwave resonator. Since the output of a ported enclosure at tuning is the port, I'd say measure from the port.

[Duran 387]

Sound waves really don't leave the port, the woofer excites the air in the enclosure, which excites the air inside the port, and it's a chain reaction from there. Do it form the port opening

[sefugi 166]

After doing some measuring, the face of the enclosure(subs and port opening) would be 5' form the base of the windsheild. Thats about 3.8' away from were it should be with a 32Hz tune.

This is the picture that stuck out in my mind that I had seen before and uses the idea that the rear wave should be 3X the front wave making the front wave 0⁰ and the rear wave 180⁰.

This info and picture came from this article: http://caraudiomag.com/articles/box-basics-part-2

[Quentin Jarrell 671]

I would build a sealed enclosure with a qtc of .707 (enclosure with flattest responce possible) and place it in your vehicle where you expect the wall to be. Then using a Term lab place the mic where you want it loudest, wheather that be at the headrest, dash, window, ect.

Then play a sine sweep to find the sweet spot where the car will peak at this location.

Then model an enclosure with a 3db or so peak at this frequency, (not tune to this frequency) and see what the response looks like. If need be you can tweek it to make it the loudest possible ported enclosure while still being musical.

If you need help modeling the enclosure just hollar.

[sefugi 166]

I would build a sealed enclosure with a qtc of .707 (enclosure with flattest responce possible) and place it in your vehicle where you expect the wall to be. Then using a Term lab place the mic where you want it loudest, wheather that be at the headrest, dash, window, ect.

Then play a sine sweep to find the sweet spot where the car will peak at this location.

Then model an enclosure with a 3db or so peak at this frequency, (not tune to this frequency) and see what the response looks like. If need be you can tweek it to make it the loudest possible ported enclosure while still being musical.

If you need help modeling the enclosure just hollar.

Thanks so much for the idea, info, support and the offer!

[Quentin Jarrell 671]

Is this going to be at scrapin