Sundown SD4-12d4 Ported Enclosure help

[NSTALN 10+ year member]

OK ported box gurus...I have a new truck, a 2019 Nissan Frontier Crew-cab. I has very little space under the rear seat but I should be able to shoe-horn a Sundown SD4-12d4. Sundown only recommends sealed...but I was curious what sort of a ported enclosure y'all might come up with. I'll only be able to squeeze about 1.25 to 1.5 cubes total so a ported 12 may be unrealistic. I'll also post the TSP's for the 10 which may be a better choice.

The key here is smallest ported enclosure tuned low...I only intend to feed the sub 500rms via a JD HD 900/5

Re - 7.0052ohms
Fs - 26.7489hz
Qes. - .7374
Qms - 5.5061
Qts - .6503
Le - 8.6610mh (@ 1khz)
Sd - 78.5398 in^2
Vas - 64.3194 L
BL - 17.9033
Mms - 200.754g
Cms - 176.3448 uM/N
Sensitivity - 83.9731 db @1w/1m
Sensitivity - 84.5498 db @2.83Vrms/1m


Thanks folks!

Just to clarify...I'm not looking for exact dimensions to fit under my seat, I'm looking for airspace/tuning/port recomendations specific to the sub...I'll figure out the logistics of making it fit later.

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[NSTALN 10+ year member]

SD4-10d4

Re - 7.3427ohms
Fs - 27.1207hz
Qes. - .6299
Qms - 4.6994
Qts - .5554
Le - 9.1167mh (@ 1khz)
Sd - 56.745 in^2
Vas - 39.9739 L
BL - 18.0508
Mms - 164.0278g
Cms - 209.9529 uM/N
Sensitivity - 82.7717 db @1w/1m
Sensitivity - 83.1441 db @2.83Vrms/1m

 

[Bobbytwonames 5,000+ posts]

I would try this setup. 1 cubic foot vented.

 

[NSTALN 10+ year member]

I would try this setup. 1 cubic foot vented. View attachment 19691View attachment 19692

It's on my short-list as well. i was leaning towards the SD$ because of the underhung design and the fact that it has 50mm+ of xmech so it would be less likely to bottom-out like many low-pro drivers do. i have heard very good things about the TW line though...may end up being my ultimate choice. i currntly own a 13tw5v1 that I'll be making a sealed box for...but I have a feeling I'll want to try a ported box though.

 

[Bobbytwonames 5,000+ posts]

The TW3 is designed for a small vented. Should sound great. Will get down to 22hz. as well. Very good specs for a shallow mount.

 

[Jeffdachef 5,000+ posts]

sundown SD series needs ported. Sounds like absolute **** in a sealed or rather just extremely weak especially in a truck yikes. The sundown will be centered around deep low frequency response more while the JL T series will have a typical musical sound focused a bit on the higher notes naturally.

 

[2RZ-FE 10+ year member]

SD are their sealed designed subs. Considered a shallow but not as shallow as other subs. Go EV3 for ported.

 

[NSTALN 10+ year member]

sundown SD series needs ported. Sounds like absolute **** in a sealed or rather just extremely weak especially in a truck yikes. The sundown will be centered around deep low frequency response more while the JL T series will have a typical musical sound focused a bit on the higher notes naturally.

I'm looking for a really low response from the driver. The rest of the system will be AudioFrog GB10 Tweets, GB25 mids and GS690's so I'll have plenty of midbass.

 

[Jeffdachef 5,000+ posts]

I'm looking for a really low response from the driver. The rest of the system will be AudioFrog GB10 Tweets, GB25 mids and GS690's so I'll have plenty of midbass.

definitely sundown over the JL 100% it kills 40hz and under, not so good above that.

SD are their sealed designed subs. Considered a shallow but not as shallow as other subs. Go EV3 for ported.

not from my experience, they performed like **** in a sealed, weak output, weak bandwidth. However my SD-3 10 had actual sundown level performance in a ported.

 

[NSTALN 10+ year member]

definitely sundown over the JL 100% it kills 40hz and under, not so good above that.


not from my experience, they performed like **** in a sealed, weak output, weak bandwidth. However my SD-3 10 had actual sundown level performance in a ported.

Any suggestions on size and tuning for the SDs?
Thanks!

 

[NSTALN 10+ year member]

Thanks for all the responses folks!