I have a JL Audio 12W-6 in the JL recommended size sealed enclosure right now driven with a Digital Audio DA2200. It has fantastic sound quality, but is lacking in SPL. I do not want to do a ported enclosure as I do not like the sound of them. I recently acquired a couple JL 12W0-8's and would like to build a custom enclosure for all 3 subs. I really need help with volumes for the enclosure to get it tuned right. I was thinking of adding .25^ft to the W6 chamber to make it 1.5^ft and adding about 2 lbs of poly-fil to it, to get really good low end extension, and then crossing it over at around 60hz. What I was thinking of doing with the W0's is, making the volume smaller in each chamber then JL's recommended size to tune them higher and then cross them over in a bandpass configuration with the the high pass around 50-60hz and the low pass around 100-120hz. What are the pros and cons of setting it up like this, and would it have any quirks in the sound? How much smaller on volume would I need to go to get it to sound right, or should I just build an enclosure with Jl's recommended volumes for all of them and cross them all over at like 80hz? The enclosure will be in a trunk and rear firing, and I listen to mainly hard rock. I know that there are some very knowledgable people on here and would greatly appreciate some help. Thanks!
Ok..I'll have a stab..
"Tuning" in general terms does not apply to sealed enclosures. It applies to ported enclosures (whatever variety they may be). It can apply to horn enclosures as well if a desired SPL v Frequency is the objective.
For sealed enclosures, the bigger the box the better applies, though there are diminishing returns as the box gets larger.
If you want a sealed enclosure then I would simply build the biggest box size and shape you are comfortable with in your car and do the other stuff you suggested (lining the box with dampener etc...) Make sure that the depth of the box is a least twice the depth of the speaker.
Try downloading WinISD and see the effects of sealed and ported boxes for your speaker(s).
Alternatively just go with the manufacturers recommendations.
Cheers & Good Luck
"Tuning" in general terms does not apply to sealed enclosures. It applies to ported enclosures (whatever variety they may be). It can apply to horn enclosures as well if a desired SPL v Frequency is the objective.
For sealed enclosures, the bigger the box the better applies, though there are diminishing returns as the box gets larger.
If you want a sealed enclosure then I would simply build the biggest box size and shape you are comfortable with in your car and do the other stuff you suggested (lining the box with dampener etc...) Make sure that the depth of the box is a least twice the depth of the speaker.
Try downloading WinISD and see the effects of sealed and ported boxes for your speaker(s).
Alternatively just go with the manufacturers recommendations.
Cheers & Good Luck
Re: Off-Topic
I have read that if the gap between the rear panel and the speaker diapragm is too shallow it affects the natural suspension of the volume. I.e. the suspension would be slightly stiffer. I'm sorry I cannot recall the article.
By twice the depth I mean if the speaker cone is 8" deep then the inside box depth should be at least 16 inches.
xplod1236 said:
I have read that if the gap between the rear panel and the speaker diapragm is too shallow it affects the natural suspension of the volume. I.e. the suspension would be slightly stiffer. I'm sorry I cannot recall the article.
By twice the depth I mean if the speaker cone is 8" deep then the inside box depth should be at least 16 inches.
Some PA drivers come with a recommendedation of back clearance. The 15's I have recommend a minumum of 3" between the back of the magnet and the inside of the box. Not sure if you have to double it for any drivers though.
EDIT: I thought it had to do with cooling as much as cabinet suspension. Could be wrong.
EDIT: I thought it had to do with cooling as much as cabinet suspension. Could be wrong.
Cal Weldon said:
I believe that's for pole vent clearance, so you don't get a "chugging" sound from the air rushing through the vent with a wall right behind it. I've always heard 1-2" from the pole vent if there is one, and no depth limitations if there is no pole vent. I've never heard 1/2 of the driver's diameter for clearance, but that doesn't mean it's not a rule, I've just never heard it.
jking,
try a box built like a typical sealed box for two subs, only a little bigger. put in a center divider in the middle of the box. load the front of the box with the 12W0's and the center divider with the other and port one side to what tune you want, i chose 35hz. basically its a bandpass box for the bigger JL and one 12W0 would be in the sealed enclosure and the other ported. a sealed box , a ported box, and a bandpass all in one. but one important step YOU WILL HAVE TO WIRE ONE 12W0 OUT OF PHASE WITH THE REST pretty easy to guess which one. i just finished this design today using 1 - 12W0 and 2 - 12" pioneers. i didn't know if it would work but it turned out great and an easy build, i finished in about 3 - 4 hours(shopping time not included i didnt have any tools this was the first box i ever built spent about 3 hours buying the stuff). but it has been built for months in my head. the sound is better than before. the frequency range is better than the old setup (the pioneers in one sealed box and the jl audio in another sealed). and no noticable drops in anything except trunk space and now it doesnt just hit at that one note that used to always stand out. it's a like a totally different system. better than before. changing boxes made a believer out of me that the box plays a major role. very happy my first attempt was a success especially with this freak of a design. i wanted to build a box that was 3 feet across at the front and 2 feet high and deep. i figured this would be about right by the specs for the 12W0 factoring in the two pioneers sharing space with the JL. that box would in no way fit in the trunk. so i just went with the biggest possible box that i thought would fit just by measuring the trunk opening. new box turned out to be 15Hx32Wx24D. MUCH SMALLER. and a perfect fit. larger by one inch anywhere i dont think would fit. im really proud of this design since its my first and its unconventional and it works
try a box built like a typical sealed box for two subs, only a little bigger. put in a center divider in the middle of the box. load the front of the box with the 12W0's and the center divider with the other and port one side to what tune you want, i chose 35hz. basically its a bandpass box for the bigger JL and one 12W0 would be in the sealed enclosure and the other ported. a sealed box , a ported box, and a bandpass all in one. but one important step YOU WILL HAVE TO WIRE ONE 12W0 OUT OF PHASE WITH THE REST pretty easy to guess which one. i just finished this design today using 1 - 12W0 and 2 - 12" pioneers. i didn't know if it would work but it turned out great and an easy build, i finished in about 3 - 4 hours(shopping time not included i didnt have any tools this was the first box i ever built spent about 3 hours buying the stuff). but it has been built for months in my head. the sound is better than before. the frequency range is better than the old setup (the pioneers in one sealed box and the jl audio in another sealed). and no noticable drops in anything except trunk space and now it doesnt just hit at that one note that used to always stand out. it's a like a totally different system. better than before. changing boxes made a believer out of me that the box plays a major role. very happy my first attempt was a success especially with this freak of a design. i wanted to build a box that was 3 feet across at the front and 2 feet high and deep. i figured this would be about right by the specs for the 12W0 factoring in the two pioneers sharing space with the JL. that box would in no way fit in the trunk. so i just went with the biggest possible box that i thought would fit just by measuring the trunk opening. new box turned out to be 15Hx32Wx24D. MUCH SMALLER. and a perfect fit. larger by one inch anywhere i dont think would fit. im really proud of this design since its my first and its unconventional and it works
- Status
- Not open for further replies.