sub upgrade

[chpthril]

An enclosure with a 3/16" thick round ABS port will have a different net internal as compared to a constructed port using 3/4" thick wood, even if the external dimension of both boxes are the same.

[dukesofhazzard]

yes I understand, thanks. I just figured if the surface was equal, then the ie A=pie x r x r =12.56 and the length is 20 = 251
A= w x h = 1.5x 8 = 12 then the length would be 20 as well, but every prog I use comes up shorter for a slot port.
so I downloaded the kicker app, and it came back a 16" length.

[chpthril]

The construction of the port changes the volume. If you retain the same tuning Hz, then something else has to change, in this case its the length as you saw.

[dukesofhazzard]

thanks for everything mike getting supplies now.!!!

[dukesofhazzard]

still cant figure out why pics get rotated but oh well,
so the box is pretty much built, I put a coat of poly urethane stain on for damp proofing, top is on now, left off for the pic, front is done too just leaving off till the end. The port is sealed off at the 90 deg bend so it is reduced to 8 x 1.5. Fit it into the boat, fits nice, will be able to keep it flush to helm wall so no loss of leg room just lose storage. anyhow, just an update and pic. more to follow

IMG_1810.jpg

[dukesofhazzard]

made a little progress today, everything is just test fit so far, sub not screwed in yet, put another coat of black poly on the entire box, and the new front wall. Have to go back to work now so will be on hold for a couple days.
sub3.jpg

[Detonate]

Looks great!!! I really need to build up the confidence to do this myself.

Couple of shops I talked to wanted sooooooo much to do the job...

[dukesofhazzard]

I can see why they want lots, it is a lot of work, but I am taking my time. You should give it a whirl. I just couldn't let 600w sit there and not be used properly, can't wait to get it setup. I think the hardest part so far was just figuring out the stupid port. I almost just went with a round port as my sub came with dimensions for that, but soon as you go slotted everything changes. I guess I just like the look of the slotted better. And remember, once you get past the part of cutting up your boat, after that it is just wood, if you screw it up, you can fix it. The wood was the cheapest part. GO FOR it.

[dukesofhazzard]

Well its a good thing the wood is fairly cheap cause my first box sounded like azzzzz, I thought my sub was blown it sounded so bad, so then I decided to cut the box down and make it a sealed box, sounded way better but thought there was way more to be had by this sub, it maxs at 1200 watts and I am giving it 600 w. It was def. punchy and crisp but needed lots of gain and volume, I really want to have some good bass when just sitting and chilling with the stereo not cranked, so back to the drawing board. changed the size of the port to 2" wide, I think that helped alot, reinforced the box, angled the corners, doubled the front of the box where the sub mounts, drilled a hole just big enough for the speaker wire to go through and siliconed, then laid down foam tape and screwed the speaker wire down do it isn't flapping in the wind so to say. Then I foam taped the top and just screwed the top down so I could get back into it later to seal the wood and change anything if need be. Well this time I got it right. She pounds pretty hard and has good volume, had to turn the gain on the amp down from the sealed box setting. Super happy now, just got all the staple head holes filled waiting to dry for final sanding and then the rubber spray truck bed liner goes on, had to make another new false wall for the helm foot area too. I didn't use any of the foot well area for the box I however did lose storage space though. anyhow just an update as to how it went. Luckily I don't charge for my own time. haha.
subbox.jpg

[chpthril]

Leaks? any leaks will kill the woofer's SQ

What was the gross external dimensions of the original box and what are they on the new one? Since going to 2"W port did you adjust the length any?

[dukesofhazzard]

for the port I shrank the height to equal the 12.56 sq in the same as the 4" pipe diameter. The manufacturer calls for 20" length. What was so confusing was when I was using the computer port calc. they were all a little diff so I just stuck as close to what D A wanted for that sub, now it sounds good, I like that it plays tight and loud and can rumble pretty darn good. The overall box volume between the two are almost indentical, as close to the manufacturers specs I could. I don't think the other box had any leaks, I think part of the prob was too much rattling going on. On the first box if you were farther away it sounded ok but as soon as you put your ear near the port you could hear what sounded like the sub distorting but it wasn't. So this one added supports, widened and reduced the height of the port, and doubled up the face material. Let's just say I am more than happy now!!!!!

[dukesofhazzard]

starting to look like a sub box now.
subbox1.jpg

[dukesofhazzard]

well here she is after crawling in and outta the boat a thousand times. Sounds incredible ( I think), the carpet actually matches better than in the picture. The gap at the bottom is for the carpet that goes in the boat, the gap is not so big then. Overall really happy with the way it turned out and how it sounds, bass through all volumes. Now it looks like I need a new battery, always something!!!!! I was looking lots when I wanted to do this, so that is why I did all shots, I usually only found the start or finished product, none in between. I used flat metal brackets and attached to front of the box and across to the existing helm wall to secure the sub box, and then drilled through the new helm wall and existing and used inserts for the bolts in the new piece and covered with the carpet and then attached from inside the compartment into the inserts. Worked great no vibrations ( atleast no extra ones.)
Time to enjoy now.
subpanel.jpg

[dukesofhazzard]

why does it do that?!!!!

[BCRider]

Looks great Kevin! I really want to do this as well this spring. Just need the boat back.