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Second Skin Audio

4 x 18's Limited Space Kerf Port


ictponder

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I'm limited to 25 cu.ft net for 4 x zv.5 18's on 10k

6" Kerf
Torres calc = 33hz
Width = 46"
Height = 6"
Length = 13.25 (9" straight parts internal roundover )

With this setup I'm just barely on the minimum side for port area (276in.sq) but i should still be under 30 meters per second. Should I raise the port another inch and get less compression (35hz tune) or will this be ok? I wanted to tune at 30 but limited space and kerf design won't allow it. Pink area is port volume. There is more bracing for subs, it's just hidden in this image.

port.jpg

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  • 2 weeks later...
On 3/15/2018 at 7:01 PM, ictponder said:

Bump! Any input on this?

Yes, but you arent going to like it :(

On 5/8/2011 at 7:38 PM, Kranny said:
On 5/8/2011 at 7:35 PM, 'Maxim' said:

It hurts me inside when I read stuff like this and remember you're 15

LMFAO so true

:blush:

Mitsubishi 3000GT (Old Build)

Headunit: Pioneer 80PRS

Frontstage: (2) McLaren Audio MLT-2 Tweeters & (4) PRV Audio MR Series Neo 6.5" Mids

Substage: 4 15" Hybrid Subs - Tantric Motors & Sundown Softies

Amps: Banda 2.4D Amp (Tweets), American Bass VFL 350.4 (Mids), and (2) Ampere 3800s

Electrical :Singer 260A Alt & JY Power Lithium

 

2005 Chevy Colorado Ext Cab

Headunit: Pioneer 80PRS

Frontstage: 4 PRV 700Ti Tweets & 6 10" Delta Mids on 3000wrms

Substage: 6 Fi BTL 18s in a 4th Order Walkthrough on 3 Wolfram 4500s

Electrical: Singer "390" and JY Power

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  • 3 weeks later...

You could always do four 15's or three 18s and not have to worry about fighting for space. Cone area is nice but properly ported enclosures with happy drivers in "optimum" airspace is better in my opinion. "Optimum" depends what you want. If you want sq then smaller ported enclosures have flatter response and less group delay although require more power due to less efficiency . Larger enclosures will have a larger peak at tuning, require less power due to higher efficiency, and get louder. Unless you're chasing 160s I think four 15's or three 18's is plenty of slam when installed and tuned properly.

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He already purchased the subs so I have to make it work. I am mostly concerned with the port volume and if this design will cause too much velocity. I can make the port slightly bigger but since I can't make the box any bigger I'd have to go from 33, which is already king of high for what he wants to 35. This design will be over 30m/s

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