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BassDrop69

Box too big? 2 SA12s

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hey guys, I have two Sundown Sa12s rev3 d4 wired to 1ohm on a Digital designs m1d in a box built by net audio. its 5.25cft air space with port tuned to 34hz. now I see sundown recommends only up to 2cft ported per sub. so is that 1.25cft over the suggested max effecting my subs performance? thanks 

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Hey mate,

The recommended enclosure design by the manufactures is done under the impression that it can accommodate most car trunk areas.  This provides the buyer an impression on box building options.  Now you can also build your own using WINISD amp or other box building app.

The rules of physics also come into play to so in order to tune the box low and loud, you will have to go bigger enclosure, much more then recommended.  A larger enclosure yields a lower tuning and increases bass response in the lower frequencies,  That is why you cannot compare those flat subwoofers for utes and under-seat subwoofers  to generate 'thunderous' bass, since the enclosure will now allow it!  In my opinion, they are very inefficient but some may love the little bump they get from them.

Secondly, its made by people in the know so you can be rest assured they will tune and set the gains for you to get the most out of them subwoofers!:laugh:

There are many people who just throw in a subwoofer in a prefab box to save money since they are just after a 'thump' in their system but each to their own! :rolleyes:

As long as you don't drive the subwoofers to distortion, you should be fine mate!   

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Seems like a reputable shop, I'm trusting that the box specs are indeed accurate. That being said the extra 1.25cf will make the box more efficient and maybe slightly boomier sounding. Sundown subs are overengineered and have a high mechanical excursion. Given the power level the subs will see after impedance rise you will be just fine using a box that big. 

Edited by THATpurpleKUSH

giphy.gif

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I got my SA 10s in like 10cubes plus. They love it. Broke my Chevy emblem off the back of my truck the other day and I only got 500watts on it. 

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@DRBOOM thanks man, very informational. Now the way my box is designed is kinda similar to the underseat boxes, as it's not very deep to fit behind my rear seats. Just wide to make up the interior airspace. 

I dont have exact measurements right off my head right now but exterior is about 52"ish width 20"ish height and about 11" deep on exterior.. back wall is doubled so mounting depth inside is about 9". When the subs sits the back wall is about 3/4" from the magnet. 

Will being this shallow of a box have an effect?  

I've attached a picture. Sorry it's hard to see but the rectanglar port is passenger side front. 

20190506_234454.jpg

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Wait where is the port relative to the woofers? That pic is too dark and tells us nothing they could be sitting on a black carpeted floor for all I know 


My wife doesn’t know about my car audio addiction...shhhh

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53 minutes ago, MattinMO said:

Wait where is the port relative to the woofers? That pic is too dark and tells us nothing they could be sitting on a black carpeted floor for all I know 

Sorry that is the only picture I had on my phone of mine personally. Here is a picture from netaudios site of one similar to mine to show where the port and subs location is. 

dodge_ram_mega_cab_sub_box_02.jpg

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18 hours ago, BassDrop69 said:

@DRBOOM thanks man, very informational. Now the way my box is designed is kinda similar to the underseat boxes, as it's not very deep to fit behind my rear seats. Just wide to make up the interior airspace. 

I dont have exact measurements right off my head right now but exterior is about 52"ish width 20"ish height and about 11" deep on exterior.. back wall is doubled so mounting depth inside is about 9". When the subs sits the back wall is about 3/4" from the magnet. 

Will being this shallow of a box have an effect?  

I've attached a picture. Sorry it's hard to see but the rectanglar port is passenger side front. 

 

those measurements are no where near 5.25 cubic feet.  its 5.14 before port and sub displacements and it sounds like there's extra thickness to the box as well. I'm pretty sure you are well below 4 cubic feet.  more like 3.5 to 3.75 cubic feet net airspace after all displacement.

image.thumb.png.5a9b36b7094c5c4f438c41f3ccc9cf09.png


09 Sienna Subs : Four Team Ascendant 18s......Sub amp: Two Taramps 15k

Headunit: Pioneer 80PRS......Mids/Highs two pioneer gm 8604 bridged, one at 4 ohms bridged one at 2 ohms bridged, one ppi 600.2 for tweets.

Front stage: Two PWX 10s per door midbass only....... PRV 6MR500 midrange....... Massive CT 2 german tweeters.

320 amp Singer alt....... 1 group 34 under the hood 6 group31 agms in the back 560 amp hours total.

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1 hour ago, Jeffdachef said:

those measurements are no where near 5.25 cubic feet.  its 5.14 before port and sub displacements and it sounds like there's extra thickness to the box as well. I'm pretty sure you are well below 4 cubic feet.  more like 3.5 to 3.75 cubic feet net airspace after all displacement.

image.thumb.png.5a9b36b7094c5c4f438c41f3ccc9cf09.png

Well now I feel stupid. I never double checked I just believed what net audio told me which was 5.25cft. Thanks. I just took actual measurements and its 60" width by 10" up top and 60" by 11" bottom. 18" height.

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Sorry for the dp lol. 

I just read up some on the smaller/shallower boxes not letting the subs get the low bass extension. Like @DRBOOM said above. Sounds like my problem. I guess I had it backwards thinking it was 5.25cft and too big lol.

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With a box that big, it would be like infinite baffle system, like using your whole trunk area for the subwoofers.!

20150207_112508.jpg

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1 hour ago, DRBOOM said:

With a box that big, it would be like infinite baffle system, like using your whole trunk area for the subwoofers.!

20150207_112508.jpg

Sorry, for my box? Or the 5.25cft net audio was talking about?

 

Edited by BassDrop69

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That's ok mate, they must have quoted you the exterior size, not the internal volume.  Since its tuned low, the internal volume has to be increased in size to accommodate for the tuning frequency.

All good mate!

 

20150228_215631.jpg

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Figured it out. Found out my back and front walls were flexing so braced with some all thread rod. It made a world of difference. Excuse the sawdust I hadn't cleaned up yet when I took the pic lol. Thank for all the input guys

15621.jpeg

Edited by BassDrop69

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Box should have had some bracing to begin with.

 


97 4 dr. Tahoe

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Wolfram amps coming soon, 3000.1, 125.4

2 Sundown Audio X 15's Tuned @ 30Hz.

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