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Second Skin Audio

4th order with 3 12s


757lmj

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Planning on running sealed section to sub specs maybe slightly larger. I want to play 26-65ish hz. 2:1 or 2.5:1 ratio?? What should I tune the port to? I've heard everything from 40hz to 65hz. I have these 3 12s in a ported box tuned to 37 hz. I'm happy with it just want to try a 4th order before my next system

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What subs are you using? What amp? What vehicle?

Arbitrary band pass box "ratios" were created and used by people who do not have a good understanding of how band pass boxes work. They are gross oversimplifications and would be like going to a shoe store and buying a pair of shoes without looking at the size or trying them on. You migh get lucky and have it work out, but its not likely.

If you want to play from 26-65 Hz, that's over an octave and is a pretty big bandwidth. You can do that with a bandpass box, but its not going to do it efficiently.

"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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To get that wider response you are looking for you will probably need to be looking at a 4th where the vented chamber is the same or even a smaller size than the sum of your sealed.

If you are feeling fun and fancy and dont mind testing a few times, try a 6th. You can get pretty damn good bandwidth and decent efficiency from those if designed right.

If you leave it till the last minute, it will only take a minute.

Build Log - 4x12's Trunk Firing 6th

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Well I'm narrowed to 28 to 55hz. I have mtx t812s, rockford 1500bdcp, chevy blazer 4 door. I have it to 3.75 ft^3 sealed and 7.55 ft^3 for the ported chamber, with a 11x11 port thats 7 inches deep. It's a 30 by 30 square box with the subs in a triangle. Also my main purpose is to get louder then my ported boxes tuned to 37hz I have now. Want them all in one box also so why not do both at the same time

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2 cubes, L port at 37 hz. Almost exact as mtx says. Cept 37 hz not 40. It's not as strong on the lows as I'd like (28) but kills the high frequencies like 45 n 50. Still shakes everything on the lows jist not as loud. I don't have any need to play over 55ish. Also drains my voltage a little the closer I am to 37hz. Also after about 55 it starts to drain quicker too. Vids on instagram of it. Names 757cln

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Those are interesting subs. They should do fairly well in a single reflex band pass box. To get the response you are looking for I would suggest 5 cubes sealed side, 5 cubes ported side tuned to 50 Hz. That should get you good output from about 28 Hz through about 60 Hz. If you go any larger on the ported side all you are going to get in a one-note wonder centered about your tuning frequency.

"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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Those are interesting subs. They should do fairly well in a single reflex band pass box. To get the response you are looking for I would suggest 5 cubes sealed side, 5 cubes ported side tuned to 50 Hz. That should get you good output from about 28 Hz through about 60 Hz. If you go any larger on the ported side all you are going to get in a one-note wonder centered about your tuning frequency.

Why the same volume on each side? Won't that take away from my dbs? I want it to be as loud as possible around 30-40 hz.

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Yes a 1:1 ratio will be less loud around tuning, you can set the ported chamber size so that you have some 3-4 dB bump there, more than that it may start to affect musicality too much, as far as tuning goes, you may want to try a removable port so that you can experiment.

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