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Need advice: Porting Back Dash to avoid dropping down the back seats

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mrreaz
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Need advice: Porting Back Dash to avoid dropping down the back seats

Postby mrreaz » September 30th, 2021, 10:02 am

For those who have a subwoofer in the trunk of a normal non-hatchback vehicle (sedan), other than having to inconveniently drop down the back seats so you can hear the full bass coming through properly, what about creating a neat hole/port in the back dash?

Can this work....will this be as effective as dropping down the seats?

Looking for any recommendations, thanks

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Re: Need advice: Porting Back Dash to avoid dropping down the back seats

Postby kavaninho » September 30th, 2021, 11:08 am

To achieve a similar output as you did when the rear seat was folded down, the opening on the back dash will need to be large. If cutting this large opening on the rear dash, ensure that you bolt/weld structural braces back into the area.
A skilled fabricator/upholsterer will be needed to remake the back dash as well.

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Rovin
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Re: Need advice: Porting Back Dash to avoid dropping down the back seats

Postby Rovin » September 30th, 2021, 11:23 am

some ppl will simple buy 1 or 2 short 4" pipe port from any shop for around $20 & cut a hole in back dash & insert port\s

measure carefully cause u dont want when u done it look crooked & make sure it have no obstacles under d rear dash metal ....

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Re: Need advice: Porting Back Dash to avoid dropping down the back seats

Postby timelapse » September 30th, 2021, 2:50 pm

Aero port through the seat like a nice big grommet

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Re: Need advice: Porting Back Dash to avoid dropping down the back seats

Postby timelapse » September 30th, 2021, 2:52 pm

Like so
336331-391df09b605e5bbd6afc7225a4da3401.jpg
336331-391df09b605e5bbd6afc7225a4da3401.jpg (5.02 KiB) Viewed 347 times

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Brian Steele
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Re: Need advice: Porting Back Dash to avoid dropping down the back seats

Postby Brian Steele » October 3rd, 2021, 9:04 am

I tried something like that years ago with my old Mazda 323. Like most car audio attempts I tried with that vehicle, it was pretty much a disaster.

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Re: Need advice: Porting Back Dash to avoid dropping down the back seats

Postby timelapse » October 4th, 2021, 9:44 am

Easy if you know what you doing and are ocd with your measurements and cutting

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Rovin
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Re: Need advice: Porting Back Dash to avoid dropping down the back seats

Postby Rovin » October 5th, 2021, 7:13 pm

imo even if u do it perfectly neat : porting of a seat backrest not only interferes with comfort for that unlucky person who has to sit in d middle & even d millionth chance of an accident what it might do to somebody's back , but it also looks ghetto

i rather port d back dash which will look more oem & not affect seat comfort\safety but thats just me ... :|

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Re: Need advice: Porting Back Dash to avoid dropping down the back seats

Postby ruffneck_12 » October 24th, 2021, 10:43 am

Brian Steele wrote:I tried something like that years ago with my old Mazda 323. Like most car audio attempts I tried with that vehicle, it was pretty much a disaster.



Image


What if you treated it like this?

The trunk basically becomes the chamber on the right

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Brian Steele
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Re: Need advice: Porting Back Dash to avoid dropping down the back seats

Postby Brian Steele » October 24th, 2021, 12:06 pm

The issue for me with that car was the location - any subwoofer placed near the rear seat sounded like crap.

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Re: Need advice: Porting Back Dash to avoid dropping down the back seats

Postby ruffneck_12 » November 2nd, 2021, 8:48 pm

Brian Steele wrote:The issue for me with that car was the location - any subwoofer placed near the rear seat sounded like crap.



That's acoustics for ya, weird af.

Worked on a Y12 and the sweet spot for the sub ended up being behind the front passenger seat, i would get PERFECT cancellation from anything 60Hz and up.

Good thing it was a small box

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