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JoshC
02-01-2012, 11:36 PM
Almost done with my build, heres what ened up in the truck.

The Truck
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Set up

HU is a Alpine CDA-105

Front stage is Hertz 165 midwoofers w/ DD T2 tweeters
Rears is a pair of Fosgate 3-ways (40wrms)
powered by a db drive Okur A5 90.5

As for the sub ive went with a JBL originally, wasnt laoud enough/never got box right. Ened up changing to a Obsidian 12 D2, box is under way(had to remove rear tray, cut wood to shape vs just dropping a box into the tray like the JBL)
Will be powered by a Memphis PRD1000.1

Have kicker 4gauge runs, stock 136amp alt, and original batt. Also used 25ft of Audio Technix 60mil for front doors, this is my first real build.

Few pics of what we got done today with the box, will get pics of rest of equipment final install day.

Box is going to be around 2cu ft @ 33Hz using 2 3' precision ports, using 3/4mdf and 2 gallons of fiberglass resin to make inside smooth and rounded


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kushy_dreams
02-03-2012, 05:53 PM
Those ports should be around 16 1/4 long including the flare for a 33hz tune. You posted something a while back that made it seem like your box builder wasn't tuning things correctly so just be aware.

JoshC
02-03-2012, 08:24 PM
Those ports should be around 16 1/4 long including the flare for a 33hz tune. You posted something a while back that made it seem like your box builder wasn't tuning things correctly so just be aware.

Really? He said they need to be 12in long each for 32-34Hz, 2 3in ports in 2cuft

kushy_dreams
02-03-2012, 08:42 PM
Put the numbers in yourself to verify it: Products Menu (http://www.psp-inc.com/tools.html)

JoshC
02-03-2012, 08:45 PM
Put the numbers in yourself to verify it: Products Menu (http://www.psp-inc.com/tools.html)

You are correct sir, thanks alot. Ill make sure hes not making them too short

kushy_dreams
02-03-2012, 08:51 PM
If he designed the box with the shorter ports, the volume will be incorrect if you lengthen the ports. The volume of the box will need to be increased to compensate for the added displacement of the longer port. I wouldn't go to that box builder any more. He may be able to build, but if he can't calculate things correctly, then theres no point.

JoshC
02-03-2012, 08:56 PM
If he designed the box with the shorter ports, the volume will be incorrect if you lengthen the ports. The volume of the box will need to be increased to compensate for the added displacement of the longer port. I wouldn't go to that box builder any more. He may be able to build, but if he can't calculate things correctly, then theres no point.

Yea i just asked him but he said we changed the volume from his original design so he needs to recalculate. But he said he will make sure its correct, ill be sure to post the final specs he uses and going to get some more progress pics up tomorrow when he lays some fiberglass. I told him before he started that on this box he needed to step his game up, so well see what he ends up doing. Im planning on making a few vids of the Obsidian in action once its done too, so ill see what you guys think as well.

pro-rabbit
02-04-2012, 09:36 AM
What all is he glassing? If he has incorrect measurements with basic math I'm not sure how he will do with trying to figure a more complicated situation.


Anyway, hope all goes well. I'm sure at the very least he can make the ports a mile long and cut em down to give the sound you want.

JoshC
02-08-2012, 05:17 PM
Just got this pic from him, this is how he got the total volume down. Ports are 12in each and im not positive about total volume but according to his program its at 33Hz

He used Winisd to get these numbers


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Back plate will be mdf except fiberglass around the pillar. Also glassing all the edges to smooth roundness. Should finish up tomorrow or friday so ill get more pics up tomorrow



More equipment pics
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kushy_dreams
02-08-2012, 05:30 PM
If the ports are 12in long and tuned to 33hz, then volume should be around 2.2cu/ft

JoshC
02-08-2012, 05:33 PM
If the ports are 12in long and tuned to 33hz, then volume should be around 2.2cu/ft

Yes and with port displacement and sub displacement it should be right at recommended volume. (1.75-2cu^ft)

kushy_dreams
02-08-2012, 05:44 PM
Yes and with port displacement and sub displacement it should be right at recommended volume. (1.75-2cu^ft)


If its any less than 2.2 after displacement, then I guarantee your tune will be higher than 33 with 12inch long ports.

The box I just built for my winter beater is 1.85cu/ft with 2 3in pvc ports 17inches long and that gives me a tune right around 32. Your box will have about the same volume and port area but around 5in less of port length. Everything is pointing to a high likelihood that your box will not be tuned to what you want it to be and instead its pointing to something between 35 and 38.

This just keeps going in a circle. I give up. I will wait to see the finished product and the sound it produces.

edited as my thoughts came together more.

JoshC
02-08-2012, 05:48 PM
If its any less than 2.2 after displacement, then I guarantee your tune will be higher than 33 with 12inch long ports. This just keeps going in a circle. I give up.

Like i said idk he put the numbers into winisd. idk what the volume is, and neither you nor that web site stated if you were to use gross or net volume. just sayin lol i never said i ran any numbers

kushy_dreams
02-08-2012, 05:57 PM
Well maybe you should learn to run the numbers to verify that other people are or aren't doing the job correctly. I just have a bad feeling about it, from what you have said so far and your posts in the past about subs in boxes this guy built as well.

JoshC
02-08-2012, 06:16 PM
Well maybe you should learn to run the numbers to verify that other people are or aren't doing the job correctly. I just have a bad feeling about it, from what you have said so far and your posts in the past about subs in boxes this guy built as well.

Yea i know what you mean. There just wasnt really any options in this town and he did it for an amp. But i did find another builder here very recently that looked to do good work, but he had some odd things to say too lol told my 90rms isnt enough for comps i needed to go coaxial if i wanted them to sound good.


EDIT: I just talked to him, the box has a volume of 2.4-2.45cu^ft so its going to be right about 2.2cu^ft after all displacement.

JoshC
02-09-2012, 03:55 PM
New pic, rings were needed up top so there room for ports to breathe. Sub hole was cut, its going to be recessed so the back ring still needs to go on. This is a pic from the back, probly going to have to remove a seat or 2 to get the **** thing in


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kushy_dreams
02-09-2012, 07:06 PM
EDIT: I just talked to him, the box has a volume of 2.4-2.45cu^ft so its going to be right about 2.2cu^ft after all displacement.

:suave: now that sounds a little better

JoshC
02-14-2012, 03:56 PM
UPDATE!!!!

Weather been really crappy, lots of rain, freezing cold, and even some snow. But he finally got a some good glassing weather yesterday to get the top done and sanded. Now we just have to add the back plate and glass around the pillar and the box is done!!!! Aside from final layer of black bed liner.


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What cha guys think? Pretty snazzy lol



UPDATE:::: Back of the box almost done
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JoshC
02-15-2012, 05:18 PM
Back dryed up, SO CLOSE TO INSTALL :)

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AND SHES DONE!!!! Just needs to set overnight

All interior edges and corners rounded :)
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Coverered in black bed liner, ready for the truck
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So what do you guys think? Crappy work good work? We will get it in by the weekend for sure and ill get a video up.

JoshC
02-15-2012, 11:42 PM
Last pic, finished coating and ports are in. She ready to go mayne

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Anyone got any kind of comment on this build?

JoshC
02-16-2012, 06:57 PM
So we got everything in and hooked up today, and DAMMMMMMNNNNN! The first test song my builders draw dropped as the 12 got as loud as his kicker L7 15 ^.^


Sounds really good, loving it :) Ill get a video up soon

kushy_dreams
02-17-2012, 05:06 PM
vid?

JoshC
02-17-2012, 05:10 PM
vid?

Ill make it today, i gotta leave my complex to do it cuz i dont bump near my casa(lots of systems janked in my area).

But im really impressed, im trying to find that list of boosted songs so i can really see what she can do. Also need to hit my memphis with a meter, i set the gains low enough i knew it wouldnt clip but idk what its at. guessing around 6-700wrms

JoshC
02-18-2012, 12:29 AM
Didnt get a chance to today, ran outa light. But i got ahold of some bass boosted songs and could hear my doors shaking at the locks(never heard that with the ported JBL P10). Also having some songs boosted right now so tomorrow will be fun

JoshC
02-18-2012, 06:19 PM
Just tryed making a few and the camera on my phone blows. Dosnt refresh fast enough to see the door flexing or keep up with the sub flexing. JUst blurriness, so ill try to get ahold of a good camera soon

redrider
02-19-2012, 11:42 PM
any install pics?