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SQL SUB.... dayton ultimax 12 vs alpine type r or s 12....


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im building an SQL set up with a single 12 for my daily. im stuck between 2 subs.

dayton Ultimax http://www.parts-express.com/dayton-audio-um12-22-12-ultimax-dvc-subwoofer-2-ohms-per-coil--295-512

OR

Alpine type S or R 12"

R: http://www.alpine-usa.com/product/view/swr-12d4/

S: http://www.alpine-usa.com/product/view/sws-12d2/

i will only be running 500rms for the sub as i plan to get the alpine PDX-V9 amp http://www.alpine-usa.com/product/view/pdx-v9/

ill be running Alpine SPR-60C in all 4 doors http://www.alpine-usa.com/product/view/spr-60c/

ive owned and heard the new type r's before and they are great in a good box but when entering some info into winisd pro it shows the dayton will have a much smoother gain and much better low end compared to the alpine. but reqires a 3.5ft^3 box to do so...

Dayton is orange 3.5ft^3 dual 3" aeros 15.5" long each tuned at 24.9Hz

Alpine Type R is Yellow 2.0ft^3 dual 3" aeros 16.5" long each tuned at 32Hz

Capture2.jpg

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Two 3" ports isn't going to be enough port area for either of those subs.

Cabin gain is going to give you a big low end boost so chances are you are going to want to shrink down your box volumes a bit to tame that. I'll post a picture later that shows how you can roughly approximate cabin gain in WinISD.

"Nothing prevents people from knowing the truth more than the belief they already know it."
"Making bass is easy, making music is the hard part."

Builds:

U7qkMTL.jpg  LgPgE9w.jpg  Od2G3u1.jpg  xMyLoO1.jpg  9pAlXUK.jpg

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Since you have the model entered, change to the vent airspeed plot, you don't want to be much above 25 m/s at rated power.

Cabin gain usually make almost worthless frequency response plots predicted by software, tale a look at predicted vs actual frequency response inside some vehicle:

cabin_gain.jpg

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Here is a filter you can add to WinISD to roughly approximate cabin gain:

tvpYzfY.jpg

Like I said, its only a rough approximation, and just how much usefullness it has is up for debate, but I consider it to be better than nothing. The f0 number can be changed based on the size of your vehicle. 60 Hz is usally pretty good for your average size SUV or sedan.

After looking at the frequency responce you are going to get with that sub, I'd probably be inclined to run it in about a 3 cubic foot sealed box with a good amount of stuffing.

"Nothing prevents people from knowing the truth more than the belief they already know it."
"Making bass is easy, making music is the hard part."

Builds:

U7qkMTL.jpg  LgPgE9w.jpg  Od2G3u1.jpg  xMyLoO1.jpg  9pAlXUK.jpg

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No vs threads

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