labyrinth porting
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=115078
Printed Date: May 28, 2024 at 3:26 PM
Topic: labyrinth porting
Posted By: thatfloorguy
Subject: labyrinth porting
Date Posted: July 14, 2009 at 7:47 PM
Anyone have any advice on using a labyrinth port design in an enclosure for a 15"L7? I have made 2 different enclosures,both slot ported so far for this sub and was not overly impressed with either. The first was 4.75^3 tuned to 40 hz, and the second was 5ft^3 tuned to 32 hz. I am intrigued by the labyrinth port but am unsure if it really works and if my driver is compatabbe with this design type.
Replies:
Posted By: thatfloorguy
Date Posted: July 14, 2009 at 11:29 PM
Ok I did some figuring and, I am going to attempt it. This will put the tuning at just under 30 hz. The gross enclosure will 35 1/2w X 15h X 24D, (driver firing upwards). The port will be 4 1/2( flared ends) X 13 1/2 X 39 1/2. (port will be rear firing) I will post pics during the build and let you guys know if my car falls apart or if the driver melts. This design allows 4ft^3 net , 1.62ft^3 for the port, and I figured .3 for driver/brace displacement as this design will require more bracing. Wish me luck and if any gurus see I am abt to commit driver suicide, well a heads up will be appreciated.
Posted By: ianarian
Date Posted: July 14, 2009 at 11:41 PM
If your enclosure and continuous power are spot on, that woofer would impress the best of them. That labyrinth concept can make a salesman a few extra bux selling enclosures, but shouldnt be needed for you to be happy with your woofer.
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This is what I do for FUN!
Posted By: ianarian
Date Posted: July 14, 2009 at 11:54 PM
If Im reading your dimensions right are you intending to have 1/3-ft3' of unvented interior space? Peep what the canadians box looks like:  ------------- This is what I do for FUN!
Posted By: thatfloorguy
Date Posted: July 15, 2009 at 12:17 AM
That is where I got the idea from. I plan on giving the driver 4ft^3 , I then figured the port and came up w/another 1.62, and added .3 for driver/brace displacement for a gross of around 6. My port isn't as long tho. I have only two chambers of port 4 1/2" apart.
Posted By: thatfloorguy
Date Posted: July 15, 2009 at 12:21 AM
It is aready pretty loud and moves the air outside the car, but just isn't that low deep bass I want. My wife says she feels me coming (the sub) from down the block but....... maybe I am just going deaf, but I want more, or expected more from this driver.
Posted By: soundnsecurity
Date Posted: July 15, 2009 at 12:30 AM
well, from what i can tell, the labyrinth port is only really for those who dont have enough space to do a normal port. i understand a really low tuned port should be long but if you have the space to make as few turns as possible then i think that would give you the most accurate tuning. i could be wrong though. i am just going off of basic intuition here.
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Posted By: soundnsecurity
Date Posted: July 15, 2009 at 12:33 AM
thatfloorguy wrote:
It is aready pretty loud and moves the air outside the car, but just isn't that low deep bass I want. My wife says she feels me coming (the sub) from down the block but....... maybe I am just going deaf, but I want more, or expected more from this driver.
you cant expect that much from a single L7 15. if you can already be heard coming down the street then i would say that's close to the limit. i wouldn't expect much more even with a new/ different box design. -------------
Posted By: aznboi3644
Date Posted: July 15, 2009 at 9:17 AM
if you want more low end output you are going to have to sacrifice higher frequency bass.
Maybe a 30Hz transmission line is in order
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Custom Enclosure Design
Posted By: thatfloorguy
Date Posted: July 15, 2009 at 2:56 PM
Is that similiar to the labyrinth design? Will I increase the chances of detroying the woofer? I still have the enclosure that you recommended first (4.75 net 65 sq" port tuned @40 hz) I then made one 5 net 60.75 sq" port @ just under 33 hz I believe. I have it in that at the moment. Woffer facing up port rear-firing. Will I get more low end or am I pretty much at the limit for this woofer as sound mentioned. Will the difference be worth the effort to do another enclosure? I want that real low end but do not want to push the driver too far, it can only reproduce 25-200 hz. How close is safe as long as my gain is set properly? As far as the higher freq bass, Will I be ok with a good set of 6X9's or comps running off the zx350.4? I was thinking to upgrade the 6x9"s in the rear and set of good to high end comps for the door panels. I know I wasn't too specific as far as the low end in the beginning. I asked for a design that will still let me throw 750 to 1000 watts @ the driver and that is what you gave me. Thank you. I hope I am not being a pain but I am thinking I am not the first to try multiple enclosures to find the one best to thier liking.
Posted By: aznboi3644
Date Posted: July 15, 2009 at 8:42 PM
the "frequency response" of the woofer will not tell you how low it will play.
it will play down to 1Hz if you want.
A t-line will lower power handling but plays low...very low.
Down the Radiation CD from the PWK Designs website and play the tones...test what frequency the bass drops off at.
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Custom Enclosure Design
Posted By: thatfloorguy
Date Posted: July 16, 2009 at 5:56 PM
Oh I have done that. The track where it counts down the freqs, It stopped just after they said 30. I had to get out of the car, no cd I have goes that low. The dash was vibrating so hard I thought the airbags were going to deploy. I didn't hear anyting until about 60, but I have the HU LP set to 63. Do I use the track of continuous bass to set my gain on the sub amp? I thought to start adjusting until it distorts then back off just under that point. I have read the thread for setting gains numerous times but want to be sure I am not missing something.
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