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monte_carlo97
06-16-2005, 11:07 AM
I am gettting ready to build a new box for my 97 Monte. I am getting bored with the old one tuned to 35 hertz. So my question is what should i tune my new one to. I am going for all out SPL. The next protion of my question is, should i make one port and put the two subs in one shared chamber like i have now. Or should i make 2 seperate chambers and two seperate ports.


Thanks,
-Dave


Any and all opinions greatly appreciated.

monte_carlo97
06-16-2005, 11:07 AM
*title is supposed to be "new Box"
no "Bew Box"
My Bad

Raven
06-16-2005, 11:17 AM
Pure SPL = tune high.
50hz, maybe?

JimJ
06-16-2005, 11:26 AM
Will probably depend on the resonant frequency of the vehicle...time to get a sealed enclosure and do some sweeps.

Moe Lester
06-16-2005, 11:35 AM
single chamber, port in the center. like jack said, tuning will depend on your res. freq.

squeak9798
06-16-2005, 11:38 AM
But if this is still for daily listening...remember you don't want to tune *too* high or music will bottom the sub out. If you want a comp/daily setup, I'd build a box with a swappable port or port plug type thingymabob whichamajigger.

JimJ
06-16-2005, 11:43 AM
Well, the phrase "all out SPL" doesn't imply a daily street-beating box to me...but the port plug would still be a good idea if he's up to the extra work that entails.

psych0ticnemes1
06-16-2005, 12:12 PM
Well, the phrase "all out SPL" doesn't imply a daily street-beating box to me...but the port plug would still be a good idea if he's up to the extra work that entails.


thats what all out spl means to me lol

squeak9798
06-16-2005, 12:19 PM
Unless someone specifically states it's a comp only box, I assume by "all out SPL" that they don't give a rats hairy *** about SQ, only output and loudness.

bcarpenterfhl
06-16-2005, 01:39 PM
aeroports are always really good for swapping and experimenting, and supposedly are great for SPL. IMO, i would start at 37-38 Hz., and gradually decrease the tuning (by cutting whatever you need to off the port) a hertz at a time.

monte_carlo97
06-16-2005, 03:46 PM
Will probably depend on the resonant frequency of the vehicle...time to get a sealed enclosure and do some sweeps.
ok. I got a sealed box. Now how will i find out the res freq. of my car.

monte_carlo97
06-16-2005, 03:46 PM
Well, the phrase "all out SPL" doesn't imply a daily street-beating box to me...but the port plug would still be a good idea if he's up to the extra work that entails.
this is going to be a comp box. I am going for max spl. Then i will make a port plug to turn it into a daily driver.

monte_carlo97
06-16-2005, 03:48 PM
if someone would be willing to spend a little time with me designing a box, i would really appreciate it.

Basically i want to find out what volume will yield the most output and what to tune to.

monte_carlo97
06-16-2005, 03:49 PM
single chamber, port in the center. like jack said, tuning will depend on your res. freq.
so single chamber is the way to go?

awhile ago the big thing on here was seperate chambers.

bcarpenterfhl
06-16-2005, 03:51 PM
to you competitors,

i dont understand how you can simply find the resonant frequency of your car, when your car is composed of so many different materials, each of which have different resonant frequencies....

is just when your panels start to resonate?

and montecarlo, if you're serious about a competition box, you will probably have to experiment with a couple different boxes, so it probably wont hurt just to make a completely different daily box.

monte_carlo97
06-16-2005, 04:00 PM
i have built a total of 6 different boxes for my car.

This time i am going to make a good one so i don't have to make any for awhile.

JimJ
06-16-2005, 04:08 PM
i dont understand how you can simply find the resonant frequency of your car, when your car is composed of so many different materials, each of which have different resonant frequencies....

Put the driver in a sealed box, take a cheap SPL meter like the Radio Shack variety, and simply run tones until you get the relatively loudest. You're just seeing what the resonance in-cabin is like, because that will depend on multiple factors, like the total airspace the sub is firing into.

monte_carlo97
06-16-2005, 04:19 PM
so should i put the box in the trunk or in the cabin of the car.

monte_carlo97
06-16-2005, 04:20 PM
also when i do get the loudest that is probably the hz that i will want to tune to?
Correct?

bcarpenterfhl
06-16-2005, 04:22 PM
just curious, what subs are going in?

Raven
06-16-2005, 06:56 PM
In the sweep, when you hit your peak SPL, that's your resonance frequency.

IF I remember rightly, you're supposed to tune just under it by like 2 or 3 hz, then play the test tone that's 2-3 hz above tuning. Don't quote me at that, try searching around the forums for a little more reliable wisdom.

monte_carlo97
06-16-2005, 08:00 PM
just curious, what subs are going in?
the mofo's

monte_carlo97
06-16-2005, 08:01 PM
In the sweep, when you hit your peak SPL, that's your resonance frequency.

IF I remember rightly, you're supposed to tune just under it by like 2 or 3 hz, then play the test tone that's 2-3 hz above tuning. Don't quote me at that, try searching around the forums for a little more reliable wisdom.
can anyone else disagree or agree with this.

monte_carlo97
06-16-2005, 08:51 PM
any more opinions.

I mean what is average spl tuning.


Cause i was talking to a guy at my dealer show that had his truck there with a blow through and he had his tuned to 58 hz and it sounds d@mn good.

monte_carlo97
06-17-2005, 07:55 PM
Put the driver in a sealed box, take a cheap SPL meter like the Radio Shack variety, and simply run tones until you get the relatively loudest. You're just seeing what the resonance in-cabin is like, because that will depend on multiple factors, like the total airspace the sub is firing into.
would i put the sub in the trunk or in the cabin. Then once i got the freq. how do i tune my box in relationship to that frequency.

Goldtaz1
06-18-2005, 01:49 AM
can anyone else disagree or agree with this.


Jmac told me to tune a quarter octave lower than my resonant frequency. Whatever your res frequency turns out to be you will need to multiply by .875 and that will tune you a quarter octave lower.

packerfan
06-18-2005, 10:20 AM
if someone would be willing to spend a little time with me designing a box, i would really appreciate it.

Basically i want to find out what volume will yield the most output and what to tune to.

Noone here is gonna know the perfect box for your situation, your gonna have to test, test and test some more. The TL if your friend...

ruckus
06-18-2005, 12:15 PM
would i put the sub in the trunk or in the cabin. Then once i got the freq. how do i tune my box in relationship to that frequency.
If your competing I would think in the cabin. Dont they put the meter in the ac vent or dash? and most competition bodies dont allow you to remove your rear seat but you can fold it down if it folds stock.

squeak9798
06-18-2005, 12:21 PM
Put the driver in a sealed box, take a cheap SPL meter like the Radio Shack variety, and simply run tones until you get the relatively loudest.

Just doing that doesn't actually tell you the res freq of the vehicle, since you aren't isolating the frequency response of the car from the frequency response of the box itself.

Take a subwoofer (10" or 12" or whatever, doesn't matter) and put it in a sealed enclosure (NOT ported). Set the box somewhere in an open area (like your yard, NOT somewhere in your house). Play a set of frequencies (say, 40hz - 80hz at 2hz or 5hz intervals..the smaller the intervals the better, but the more time consuming) through the sub while in the open area, measure the output level of each frequency with your meter and record on a sheet of paper each frequency and it's output level. Now, take that same sealed box and place it in your car. Play the same set of frequencies now with the box in your car, and again record the output level of each frequency. Now you need to compare the output levels of each respective frequency between the open area and in-car enviornments. The frequency that has the greatest difference in output between the two measurements (in-car and open area) is the frequency that your vehicle peaks at.

Or, you can do this method: http://www.bladeice.com/resfreq.htm

monte_carlo97
06-18-2005, 07:48 PM
you wouldn't happen to have a mic would you squeak?

squeak9798
06-18-2005, 08:31 PM
you wouldn't happen to have a mic would you squeak?


Nope.

But, from what I hear, Concept Audio (I think that's their name) in Ft. Wayne has one.

And, like I've told you before.....Chris Norris here in Ft. Wayne should for sure. And he'd be a great guy to get some advice and knowledge from while you are there. Termpro Profile Here (http://audioforum.termpro.com/cgi-bin/ubb/ultimatebb.cgi?/ubb/get_profile/u/00010080.html)

monte_carlo97
06-20-2005, 09:07 AM
have you ever met up with chris?

Plus there is a place here that has a mic but the guy will only let me do 3 30 sec runs for 10 bucks. He was a **** about it.

monte_carlo97
06-22-2005, 12:00 AM
b-u-m-p

monte_carlo97
06-25-2005, 12:39 PM
ok here is the deal. I have been playing with different freq. for the last 2 days and it has become a major pain in my @ss and i don't want to deal with it anymore.



What freq. should i tune to?

squeak9798
06-25-2005, 12:49 PM
have you ever met up with chris?



No, never at his shop. But from e-mails he seems to be a pretty friendly guy.


ok here is the deal. I have been playing with different freq. for the last 2 days and it has become a major pain in my @ss and i don't want to deal with it anymore.

What freq. should i tune to?

LOL......you do realize that without knowing any info, our guess is as good as yours :) Maybe try posting on Termpro and see what people with your style car are having good runs with?

But, what type of frequency tests have you done? What were the results?

monte_carlo97
06-25-2005, 12:54 PM
i have been playing with sweaps and tones. Trying to find out which ones work the best and i am getting no where.


The problem with termpro is that you have to have a non-free email address to sign up and i don't have one of those.

monte_carlo97
06-25-2005, 11:48 PM
you wouldn't happen to have Chris' email address would you squeak. If so pm me.

bigwheel15
06-26-2005, 12:11 AM
you wouldn't happen to have Chris' email address would you squeak. If so pm me.

From the link squeak posted, his email addy is CNINSPL@AOL.COM

squeak9798
06-26-2005, 12:22 AM
From the link squeak posted, his email addy is CNINSPL@AOL.COM

Yup, that's the e-mail addy I have

monte_carlo97
06-26-2005, 09:51 AM
Emailed him to see if he could offer any insight or help.

Thanks,
Squeak

skeptikal
06-27-2005, 12:22 PM
Concept Audio charges $15 for 3 30second runs. And they don't use a TL mic, they use a SPL-190 mic

monte_carlo97
06-27-2005, 03:22 PM
the average seems to be about $5 for every 30 sec.


I wish someone on here had a termlab within driving distance that would let me use for about 1 hour or so. They will be compensated for letting me do this.

monte_carlo97
06-27-2005, 03:23 PM
Concept Audio charges $15 for 3 30second runs. And they don't use a TL mic, they use a SPL-190 mic
it would take me about a total of 40 runs at that rate by the time i am done with it and that would cost me about $200. I might as well buy a termlab. :rolleyes:

squeak9798
06-27-2005, 03:25 PM
Concept Audio charges $15 for 3 30second runs. And they don't use a TL mic, they use a SPL-190 mic


I'm no SPL junky.....but from what I hear, the 190 isn't all that far off from the TL.

squeak9798
06-27-2005, 03:28 PM
it would take me about a total of 40 runs at that rate by the time i am done with it and that would cost me about $200. I might as well buy a termlab. :rolleyes:

Get ahold of audiolife. He knows the guys from some big-name shop in Ohio pretty well (for the life of me can't think of the shop's name). He also knows another DBDrag competitor from my area named Nate Kaiser.

So he/they may know someone else in the area with a meter you can borrow.


Or hopefully Chris will get back with you soon.

monte_carlo97
06-27-2005, 03:29 PM
i checked me email last night and no word yet.

monte_carlo97
06-27-2005, 03:31 PM
i will try and get a hold of audiolife and see if he can help me out at all.

skeptikal
06-27-2005, 03:35 PM
I'm no SPL junky.....but from what I hear, the 190 isn't all that far off from the TL.

NJack2AF said that his buddy with (2) 15" L7's ported in the back of an expedition or whatever it was only hit a 125.x on that mic. I don't know if they have the settings all weird or whatever.

squeak9798
06-27-2005, 03:36 PM
NJack2AF said that his buddy with (2) 15" L7's ported in the back of an expedition or whatever it was only hit a 125.x on that mic. I don't know if they have the settings all weird or whatever.

:eek:

I can fart a 125. Hmmm....yeah, I don't know what's going on there...LOL

monte_carlo97
06-27-2005, 03:39 PM
NJack2AF said that his buddy with (2) 15" L7's ported in the back of an expedition or whatever it was only hit a 125.x on that mic. I don't know if they have the settings all weird or whatever.
that is a little off. that is hard to believe.

skeptikal
06-27-2005, 03:41 PM
lol dave do you wanna split the cost of a termlab? getting one could yield alot of fun ;P

AznRevlAzn
06-27-2005, 03:45 PM
god i wish i was in ohio so i can split the shares on the mic :(

monte_carlo97
06-27-2005, 03:50 PM
lol dave do you wanna split the cost of a termlab? getting one could yield alot of fun ;P
that wouldn't be a bad idea.


BTW did you talk to Antwon (SP?)

skeptikal
06-27-2005, 04:02 PM
yeh. you'd have to call him and get something set up. I'm sure he'd do it. The eclipse engine blew up so he's gonna dump another $15,000 into a new engine and performance parts and switch it from a automatic to 6-speed manual.

well if you can find a Termlab for a decent price around somewhere let me know and I'll see what I can do moneywise.

squeak9798
06-27-2005, 04:09 PM
http://server1.termpro.com/Classifieds/XcCPViewItem.asp?ID=7826

:D


Not bad if it comes with everything.

monte_carlo97
06-28-2005, 08:15 AM
http://server1.termpro.com/Classifieds/XcCPViewItem.asp?ID=7826

:D


Not bad if it comes with everything.
that is not a bad price i might have to inquire more.

Squeak you interested in buying in to. I know you wanna have access to a termlab.

skeptikal
06-28-2005, 01:31 PM
hm... $150 each way... wouldnt be a bad idea for a mic

monte_carlo97
06-28-2005, 04:45 PM
can someone tell me, that knows for sure, what to tune my box to in relationship to the resonant freq. of my car. That is all i really need to know.

Shyne151
06-28-2005, 05:43 PM
My box is tuned to 38 or 39hz in my monte and it sounds fine and gets pretty loud.

monte_carlo97
06-28-2005, 11:46 PM
bump