JL Audio 10w7 Ported Box DIY Build - AVS Forum
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post #1 of 40 Old 01-15-2014, 12:43 PM - Thread Starter
 
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So my friend and I are building a sub box for himself and for myself. We got started last night - so far we got the 6 sides cut to size- next will be bracing / gluing things together.

More pics to come and I will include the cut sheet and other info.
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post #2 of 40 Old 01-15-2014, 12:46 PM
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post #3 of 40 Old 01-15-2014, 01:16 PM
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Haha someone's excited about their build!

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post #4 of 40 Old 01-15-2014, 01:42 PM
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post #5 of 40 Old 01-15-2014, 01:57 PM
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post #6 of 40 Old 01-15-2014, 01:57 PM
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Quote:
Originally Posted by Ryan Flynn View Post

So my friend and I are building a sub box for himself and for myself. We got started last night - so far we got the 6 sides cut to size- next will be bracing / gluing things together.

More pics to come and I will include the cut sheet and other info.

How about some pix?
But, only one posting!

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post #7 of 40 Old 01-15-2014, 04:08 PM - Thread Starter
 
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Huh? I didn't even think it posted once! I clicked submit but nothing happened. I didn't get a chance to Iook at the DIY section but it sounds like it posted multiple threads?

Sorry about that guys! I'll try to go delete them... Crazy! I've only had a single twelve pack today, usually things like this don't start to happen until later in the evening. (Jk)


The pic with the finger pointing is to show the depth of the port.







*

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post #8 of 40 Old 01-15-2014, 04:10 PM - Thread Starter
 
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The hundred dollar question is what amp should he buy to drive it? Inuke1000dsp?
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post #9 of 40 Old 01-15-2014, 04:20 PM
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What is the final enclosure volume and port tune?

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post #10 of 40 Old 01-15-2014, 04:38 PM - Thread Starter
 
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3.81 ft³ tuned to iirc 22hz with a 4"dia * 15.1" port
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post #11 of 40 Old 01-15-2014, 04:51 PM - Thread Starter
 
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Edit: tuned to 20hz

Double edit : I was right the first time with 22hz
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post #12 of 40 Old 01-15-2014, 04:57 PM
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4" dia x 15.1" port in a 3.81 cu ft enclosure has a tuning of 22hz. Air velocity is a bit high with just 200w so you will get some noticeable chuffing if you run something higher like 300w+.

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post #13 of 40 Old 01-15-2014, 08:23 PM - Thread Starter
 
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You are right... 22 Hz I was not the one to decsign the box. I believe he wants to run 400+watts... How can he avoid chuffing?
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post #14 of 40 Old 01-15-2014, 08:57 PM
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Adding another port but then port length doubles. For a 22hz tune and a 3.81cu ft enclosure, you'll need TWO 4" dia x 33.65" ports. This will also take up a bit of volume of your enclosure, about 0.489cu ft.

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post #15 of 40 Old 01-15-2014, 09:13 PM - Thread Starter
 
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Yikes... How about a very mini Marty style sub? Could we make a large slot port on the bottom like a Marty sub?
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post #16 of 40 Old 01-15-2014, 11:38 PM
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With 500w I would be ok with a 2x12x30.75" slot port. If you plan to run at 750w then I would increase it to 2.5x12x39"

 

Here is a simulation of your original port size of 4" dia x 15.1" shown in green. The new slot port of 2x12x30.75" shown in grey.

Power input is 500w for both. Its recommended for air velocity to be below 18m/s but it can be a bit higher if the ends are flared.

 

 

 

Also, what highpass filter will you be using? The iNUKE DSP can set one, lowest being 20hz but I believe it can be lower with a few tricks.

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post #17 of 40 Old 01-16-2014, 12:11 PM
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Edit: Double post

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post #18 of 40 Old 01-16-2014, 12:14 PM
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Hi All, thanks for the input on my build.  

I tried to model the box in winisd. Can someone help my understand why my model shows the vent mach at an acceptable level for this size box and tune, yet others have a different size necessary?

I just want to understand where my model went off. My model assumed 400w input.

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post #19 of 40 Old 01-16-2014, 02:17 PM
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Try using a new version of Winisd.

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post #20 of 40 Old 01-16-2014, 02:40 PM
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Alright. Well, I can change the port size to the one you recommended. My question is did your box port size calculation take into account the displacement of the port size? Or would I have to enlarge the box by the additional port size in order to keep the net volume 3.81 ft^3 and my tune at 22 hz?

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post #21 of 40 Old 01-16-2014, 02:51 PM
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Quote:
 Alright. Well, I can change the port size to the one you recommended. My question is did your box port size calculation take into account the displacement of the port size?

no

 

Quote:
 Or would I have to enlarge the box by the additional port size in order to keep the net volume 3.81 ft^3 and my tune at 22 hz?

yes

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post #22 of 40 Old 01-17-2014, 01:10 PM
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Alright, thanks for your help. I will rework my box design. 

I plan on changing to a slotted port per your recommendation. My question is can I change the width/height/length of the port as long as I keep the same port volume as 2 X 12 X 30.75?

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post #23 of 40 Old 01-17-2014, 01:47 PM
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You can change it however you like but its best to confirm with Winisd that your new dimensions are good.

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post #24 of 40 Old 01-22-2014, 02:44 PM
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Based on the feedback I've gotten here I've remodeled the box to take into account a port of 12x2X31 slot and maintained 3.8 ft^3 of internal air volumes

Over the last few days we have made some good progress. The last steps before finishing will be to implement some front to back bracing and put the last 2 sides on. 

 

 

 

 

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post #25 of 40 Old 02-05-2014, 07:28 PM
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post #26 of 40 Old 02-05-2014, 07:31 PM
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post #27 of 40 Old 02-05-2014, 07:42 PM - Thread Starter
 
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Sounds excellent.   It hits very low as well.  Smooth, crisp beats from the little 10"... Jealous!

 

Needs to have the port painted black and it will be done.

 

I have a few pictures I will post up of the build

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post #28 of 40 Old 02-06-2014, 09:00 AM
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I am very satisfied with the way it sounds. We didn't mess around too much with the filters on the Inuke too much so it was a very temporary setup but I think with some dialing in it will sound very very good. 

Ideally I would have used a bigger driver.  I feel like the 10W7 will be taxed in the average basement room when listening at louder levels.  That, however, has yet to be determined until after it gets dialed in.  For now it sounds good, hits low, and is loud enough for most environments in a medium sized room. 

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post #29 of 40 Old 02-08-2014, 06:40 PM
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Plastidipped the port black today
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post #30 of 40 Old 02-08-2014, 06:43 PM
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Well after some tuning on the Inuke 3000 we got this thing to sound really good. Very happy with how it sounds. No port noise even at full excursion. It hits hard and low for the sample scenes we watched and musically sounds great. Really nice detail and clarity. 

Also happy with how the box turned out. The Oak veneer with the espresso stain looks great. Of course the W7 looks beautiful as well. 

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