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Old 12-28-2016, 07:42 AM   #1
randy8876

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Prius C downfiring stealth subwoofer

I previously built a sealed fiberglass box that allowed me to keep my spare. It sounds really good, but I kind of craved more bass. A ported box takes up added space, and after talking extensively with JL Audio I came up with the specs I wanted.

The external dimensions are 22"x39" for the bottom piece. The top is the same size as the factory carpet. It is externally 5" deep and 3.5" deep internally. The sub box is only .9 ft^2, so a divider is used to give a storage area. I'll put Fix-a-Flat and other car stuff in there.

I'm still waiting on the carpet and terminal, but figured I'd get some pictures posted for anyone interested.


Here is how the box will look when installed in the car. A solid flat surface that is sealed from water and carpeted. The sub will downfire and the port is on the top left.


The right side is a storage compartment. I'll carpet the interior and put a handle on it. I'm considering using magnets to hold the lid tightly in place. Since this box requires ditching the spare I'll get run-flat tires this summer and use the compartment for Fix-a-Flat and other roadside assistance materials.


This is the internals of the box. It houses one JL 10TW3 firing down. At .9 cubic feet the box is larger than the factory recommendation, but I spoke with JL reps that said tuning it to 31 Hz and using a subsonic filter at 28 Hz should allow it to perform well and gain a little extra low end. They aIso said do not go any larger than .9 cubic feet.

Other angle showing the depth of the box and the port.


For those of you that are interested in the design and theoretical performance here is how it plots in WinISD. The red line is the box I just built. The blue line is the sealed box I had before built to JL factory spec. The green line is a ported box, also built to JL factory spec. These graphs have the subsonic filter set at 28Hz, but I didn't show my low pass filter that is set at 65Hz.



I still need to get the terminal to wire the sub, cut a notch in the center bottom of the box where there is a high spot on the floor so the box will sit flat and fiberglass over the high spot, and seal and carpet the entire thing.

If anyone wants specific pics let me know. Tomorrow I'll take some of it in the car.
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Old 01-03-2017, 04:32 AM   #2
neillio

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Overpriced shallow mount woofer @ $279+ but hey...if you like it, that's what matters. I would probably go 80-90hz on the lpf.
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Old 01-04-2017, 05:31 PM   #3
randy8876

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I'm pretty happy with the JL 10TW3. I haven't heard any other shallow mount subs that compare.

I set the crossover points at 30hz and 70hz. I'm amazed at how hard it hits compared to the same sub set up in a sealed box.

Here's the box in the car prior to being finished. The small square hole is due to a bracket on the floor. I glassed over it.


Here's the box with the hole patched about to have the top glued and screwed on.


I'll add a speaker terminal when it arrives and carpet the box eventually. For now, I'll paint it with black rubberized paint. That should seal it up tight from water.
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Old 01-04-2017, 08:23 PM   #4
neillio

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Work looks solid. I'm a big fan of the Sundown SD-3 drivers.
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Old 01-05-2017, 12:08 PM   #5
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I like the enclosure. I do have to agree with neillio, that you could have saved some money and probably increased performance with the Sundown SD, but the JL is a solid sub too - just a bit pricey.
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Old 01-17-2017, 08:26 PM   #6
randy8876

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Here it is in the car. I just ordered a new trunk mat, after that it will look 100% stock. Even the floor of the trunk is at the stock height.


I love the deeper bass from this box. The sealed box was nice and had a good kick, I just wanted more volume.
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Old 01-19-2017, 12:49 AM   #7
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Looks nice. Glad it's working out for you.
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