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View Full Version : X2 Stock JL sub (making a box?)


hawaiianstiln
10-08-2009, 06:12 PM
I was doing some searches, but maybe not the correct way. I could have sworn some MC owners have built a custom box for that free air JL sub. Anyone know who did that and if it made a huge difference? I was hoping to see pics on that install again.

rgardjr1
10-08-2009, 07:07 PM
I never saw pictures, but here is a thread where it was discussed if you haven't seen it:
http://www.mastercraft.com/teamtalk/showthread.php?t=30369
Do you have a heater in your boat? I was thinking about doing this, but my heater vent is in the way. I bought a bow filler cushion so I think I'm going to build a box and add a second sub to sit under the the cushion.

ORX-1
10-08-2009, 07:31 PM
What I have seen done is the heater rerouted through the cup holder holes, I think it is pretty much a perfect fit.

Big Dogg
10-08-2009, 07:43 PM
If I remember correctly (I may be wrong and Im sure Ill be corrected) but KnoxX2 has his stock FA 10 in a box in his X2

rgardjr1
10-08-2009, 09:14 PM
What I have seen done is the heater rerouted through the cup holder holes, I think it is pretty much a perfect fit.

I will have to look into that it's a great idea.

hawaiianstiln
10-08-2009, 11:37 PM
found KnoxX2's post. This is the one: http://www.mastercraft.com/teamtalk/showthread.php?t=30640

I just need to find out the correct dimensions for that box if I port it. I didn't know you could take a free-air sub and build a ported (tuned) box for it.

Ported boxes are the best for boats (I think so). Only problem is, is that they take up more room than a sealed box.

hawaiianstiln
10-09-2009, 12:21 AM
I can't seem to find anywhere that references specs on this sub (M101B5-4) to be ported, only sealed.

Minimum Sealed Enclosure Volume: 1.25 cu. ft. / 35.4 litres
Optimum Sealed Enclosure Volume: 2.0 cu. ft. / 56.6 litres or larger

http://marine.jlaudio.com/products_subs.php?prod_id=440

and I know this box won't fit in my X2 by using the measurements listed on the site (below). I'm wondering if KnoxX2's JL audio dealer just tried out a custom ported box that fit under there and it just happen to work well.
http://mobile.jlaudio.com/products_enclosures.php?menu=8&prod_id=315

rgardjr1
10-09-2009, 01:25 AM
It's been a while, but i kind of remember the rule of thumb was ported boxes require about twice the volume as sealed boxes. I've been out of the car stereo scene for 15 years so not sure I'd trust my memory ...

hawaiianstiln
10-09-2009, 11:04 AM
yep, just got off the phone with JL and they told me not to put that sub in a ported box. There are no specs for it and they do not recommend it, but only use it for free air or sealed enclosure (1.25 - 2.0 cu feet).

I'm going to make a sealed box for this and will post back on the dimensions that I use to fit a box in that storage area (behind the driver seat) in an 2007 X2. I will probably keep the grill on the outside like how KnoxX2 did and then just throw the sub in a box inside that storage compartment. more to come.....

btriantos
10-09-2009, 11:05 AM
I can't seem to find anywhere that references specs on this sub (M101B5-4) to be ported, only sealed.

Minimum Sealed Enclosure Volume: 1.25 cu. ft. / 35.4 litres
Optimum Sealed Enclosure Volume: 2.0 cu. ft. / 56.6 litres or larger

http://marine.jlaudio.com/products_subs.php?prod_id=440

and I know this box won't fit in my X2 by using the measurements listed on the site (below). I'm wondering if KnoxX2's JL audio dealer just tried out a custom ported box that fit under there and it just happen to work well.
http://mobile.jlaudio.com/products_enclosures.php?menu=8&prod_id=315


Did you look at these links? http://mobile.jlaudio.com/support_pages.php?page_id=148

btriantos
10-09-2009, 11:07 AM
I'm curious how this turns out for you. I have major plans to box and add an addition sub in the same inclosure for this winter's project...

JimN
10-09-2009, 11:10 AM
found KnoxX2's post. This is the one: http://www.mastercraft.com/teamtalk/showthread.php?t=30640

I just need to find out the correct dimensions for that box if I port it. I didn't know you could take a free-air sub and build a ported (tuned) box for it.

Ported boxes are the best for boats (I think so). Only problem is, is that they take up more room than a sealed box.

You could contact JL about the box size. The port length and diameter will be determined by the box's internal volume and the tuning frequency needed.

Some woofers will work this way, some won't. The Qts is one indicator of how it should be used. In the Qts = .2 -.3 range, it needs to be in a sealed box, in the .4 - .5 range, it needs to be ported and in the .3 - .4 range, it could be either but it won't necessarily work for high power use. It's always best to not compromise. A free air woofer will usually have a much higher Qts.

Actually, a vented box will go deeper than a small sealed box with a given woofer. With a woofer that was designed for a small box, it can go very deep and the main advantage to sealed is that the sound isn't as boomy.

JimN
10-09-2009, 11:15 AM
It's been a while, but i kind of remember the rule of thumb was ported boxes require about twice the volume as sealed boxes. I've been out of the car stereo scene for 15 years so not sure I'd trust my memory ...

A lot has changed in 15 years. Back then, only a few woofers were made specifically for small boxes and about 10-12 years ago, they finally came to their senses. Kicker was making 12" drivers that worked best in a 1ft³ box at the same time some of Infinity's 12" woofers needed 3ft³. Also, I wouldn't trust a "rule of thumb" now. Besides, there's enough free box design software that it isn't necessary to guess anymore.

nmcjr
10-09-2009, 09:14 PM
Just to throw out a slightly different angle: If you are going to go through all the trouble, it might be worth investigating a different sub. They aren't super expensive, and you may get more bang for your buck, also in a smaller enclosure. For example, I went with a specific Boston 12" that only required 1 cuft, and is very efficient from a power stand point, and is thuderous. JL's are great for sure, but I have not heard a boxed JL free air sub before, so just speculating that one made to be enclosed MIGHT be a better bet, plus you could go with a 12 too. Anyway, just a thought.

rgardjr1
10-10-2009, 10:06 AM
There is a guy that sells/builds sub boxes on Ebay. He builds a 1.31 box that he list as a "perfect fit" for the JL sub. Here is a link to the auction:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=290302016774

hawaiianstiln
10-11-2009, 11:40 PM
WOW, finished the sealed box for this free air JL audio 10" sub and what a difference. It sounds 200% better than it did. I will post pics and dimensions soon, but it ended up being about 1.4 cubes. It's about 22.5" long with about a 110 degree angle on the bottom of the box to make up for the slant/angle on the floor inside that compartment. It's the same storage area where the sub was installed by the factory (behind the driver seat in an X2). I left the factory white JL grill on, but behind that there is a 10" hole. Sounds very true when it fires now. Before it just didn't sound true to me.

Loffgren
10-12-2009, 12:45 PM
yes let us know the box specs...pls

KnoxX2
10-13-2009, 04:05 PM
I can't seem to find anywhere that references specs on this sub (M101B5-4) to be ported, only sealed.

Minimum Sealed Enclosure Volume: 1.25 cu. ft. / 35.4 litres
Optimum Sealed Enclosure Volume: 2.0 cu. ft. / 56.6 litres or larger

http://marine.jlaudio.com/products_subs.php?prod_id=440

and I know this box won't fit in my X2 by using the measurements listed on the site (below). I'm wondering if KnoxX2's JL audio dealer just tried out a custom ported box that fit under there and it just happen to work well.
http://mobile.jlaudio.com/products_enclosures.php?menu=8&prod_id=315

Thats what he did! cu ft was 1.5 I think!!!! I can go by there and talk to them if you want.

ORX-1
10-13-2009, 07:17 PM
where did you move the heater tubes?

hawaiianstiln
10-13-2009, 09:41 PM
Heater tubes?? Oh, I only have a heater tube underneath my steering wheel and then one on the side as you walk thru the walkway. So I guess I don't have that problem.

KnoxX2
10-14-2009, 10:40 AM
Sorry no heater ................ Yet in my boat!

BTW I also installed a PAC 1 controler on the sub so I can adjust the level for the wide range of music my family likes! Works great!!!!!!