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  #1  
Old 10-10-2012, 03:56 PM
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Location: Los Angeles
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Old cabs w/New Speakers/DIY Cab Adventure Club....the good, the bad and the fugly.

With so many recent threads on the topic, I thought it would be interesting (and a great information source) to get as many detailed posts/pics/clips as possible about updated/DIY cabs in one mega thread. Or, if you know of a recent thread, have a thread already or planning on starting one, take a second and post a link here.

Let's see your project(s)!

Here are a few links to start things off:
JohnK_10 Custom DIY 2x15 cab build
Jmac Jmac's Nidacore/Composite- 215 cab build thread
Chokeslam512 Yet another DIY Cab thread
Stumbo New era for DIY cab builders/cabs needing replacement speakers
SBrown Another D.I.Y. cab project- quest for light gear
Rhythm5 DIY Speaker Threads?
gimp Peavey 2x15 Project - Complete
fEARful TB wiki Builds in progress or completed
greenboy website: http://greenboy.us/fEARful/

Last edited by Stumbo : 10-13-2012 at 12:00 AM.
  #2  
Old 10-11-2012, 06:20 AM
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Some important information for all DIY.

WinISD and WinISD pro calculates erroneous dimensions for the vents.

The error increases dramatically with the number of speakers.

If there is only one speaker in a given box then the vent dimensions seem to be ok.
  #3  
Old 10-11-2012, 06:29 AM
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Quote:
Originally Posted by ThisBass View Post
Some important information for all DIY.

WinISD and WinISD pro calculates erroneous dimensions for the vents.

The error increases dramatically with the number of speakers.

If there is only one speaker in a given box then the vent dimensions seem to be ok.
First I have heard of this. Care to back up this statement with a source?
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Who the heck wants to "cut" through a mix anyway? I want to punch the mix in the balls. Anyone can cut through the mix. Not everyone can beat the mix's ass.
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Originally Posted by Kawai-chang View Post
Yesterday my purple starfish was hurty.
  #4  
Old 10-11-2012, 06:54 AM
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The implementation for the Helmholtz-Resonator seems to be wrong.

I myself had problems with erroneous vent dimensions some years ago.
A prof cab designer here in Germany told me the reason is erroneous WinISD.

Since this happened I give more trust to a simulation software that is also used by Emminence.
The OEM version is from HT Audio.

Pull up any Emmince cab design from their website and try to compare with WinISD.
The vent dimensions are very different.


If I remember correctly,
the calculated vent length for a given fb is far too long.
2 speakers approx. +40% error
4 speakers approx. +70% error

If you don't know what you don't then it is not mandatory audible that the vent length is bit too long for a designed fb.

The lower frequency response lacks a little bit but the lack is not dramatically for a 210/212/215 cab.
By the other hand it is good practice IMO to do the fine tuning for the vents length with the ears.
So if the length is a bit too long calculated but the ears say the length should be a little bit shortened ....
Of course it needs some experience to do like that and yield the goal.

Last edited by ThisBass : 10-11-2012 at 08:02 AM.
  #5  
Old 10-11-2012, 08:07 AM
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Location: Detroitish
I've only done one, pretty much just buy cabs now.

Cab project is completed, and sounds great!
  #6  
Old 10-11-2012, 07:08 PM
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Location: SF Bay Area
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Here's some composite love:

ZacLite 1 and 2
DIY Lightweight Composite Cab Build
DIY Lightweight Composite Cab Build II - ZL1263, 3-way

Petebassís composite
Another Composite cab build - inspired by Zac

Ronís ultralight build
Ultra Light Weight Bass Cabinet

I'll throw mine at the end
DIY GFRP Sandwich Panel 1x15PR400

Not composite, but I really like this little guy:
1x8 DIY practice cab build
  #7  
Old 10-12-2012, 01:01 PM
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Here is one I did last summer , worked out very well .

New cab build


Last edited by Blues Bass 2 : 10-12-2012 at 03:21 PM.
  #8  
Old 10-12-2012, 01:27 PM
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Quote:
Originally Posted by CL400Peavey View Post
First I have heard of this. Care to back up this statement with a source?
Greenboy has documented it pretty well for the case of shelf ports.
  #9  
Old 10-12-2012, 01:29 PM
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Quote:
Originally Posted by Passinwind View Post
Greenboy has documented it pretty well for the case of shelf ports.
Good to know. Shelf ports only or does it work with cylinders as well?
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Quote:
Originally Posted by JimmyM View Post
Who the heck wants to "cut" through a mix anyway? I want to punch the mix in the balls. Anyone can cut through the mix. Not everyone can beat the mix's ass.
Quote:
Originally Posted by Kawai-chang View Post
Yesterday my purple starfish was hurty.
  #10  
Old 10-12-2012, 01:31 PM
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Quote:
Originally Posted by Stumbo View Post
With so many recent threads on the topic, I thought it would be interesting (and a great information source) to get as many detailed posts/pics/clips as possible about updated/DIY cabs in one thread. Or, if you know of a recent thread, have a thread already or planning on starting one, post a link here.
I got tired of searching for links to my own DIY project threads over and over, so I'm slowly porting all the pics and documentation over to my own website: http://passinwind.com .
  #11  
Old 10-12-2012, 01:55 PM
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Quote:
Originally Posted by CL400Peavey View Post
Good to know. Shelf ports only or does it work with cylinders as well?
Not sure, but I always measure actual tuning for myself and then let my ears ultimately decide anyway.

Last edited by Passinwind : 10-26-2012 at 05:42 PM.
  #12  
Old 10-12-2012, 05:14 PM
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Never had a problem with WinISD and round ports. They've all come in as expected, or within the small tolerance that the human ear can't tell the difference.

Did have a problem getting a shelf port to act right though. As I understand it, there is a bit of the cabinet walls acting as a port "lengthener" when the port is particularly short in height compared to it's width, or maybe just shelf ports that don't have much height in general.


Some discussion of it in this thread. Cab building question about shelf port length...

This online calculator http://www.carstereo.com/help/Articles.cfm?id=31 is said to be more accurate with the shelf ports.

Ironically, when doing some preliminary modeling on my next build, the car audio calculator and WinISD both gave me the same length for some 2" x 5" shelf ports. The car audio calculator will not accept measurements that have a height to width ratio of greater than 1 to 8. WinISD will. Perhaps that has something to do with the inaccuracies?

Never done a really detailed build thread here. The next one (if I can ever get damn time to do it), I will take photos, do some step-by-step and explanations. Will include final measurements vs. modeling program predictions, etc. Don't expect it anytime soon though. Ah...life gets in the way sometimes....such is life.
  #13  
Old 10-12-2012, 07:24 PM
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Re: port end corrections, I found this link recently digging around TB (I think). Never tested it, but the thread it came from iirc had some verification:

http://www.diyaudio.com/forums/multi...ml#post1148924

Here's the other audio-related bookmark I have on how to input data into WinISD (one of the more frustrating things when you start out):

http://www.diyaudio.com/forums/subwo...se-winisd.html
  #14  
Old 10-13-2012, 05:23 AM
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ok, I did WinISD again.

http://www.eminence.com/pdf/DeltaliteII_2512_cab.pdf

2 x 12 Bass guitar cabinet:
Emminence design:
Lv = 4.1 in

WinISD:
Lv = 5.8 in
  #15  
Old 10-17-2012, 04:10 PM
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Quote:
Originally Posted by Blues Bass 2 View Post
Here is one I did last summer , worked out very well .

New cab build
Nice cab!
  #16  
Old 01-16-2013, 04:02 AM
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Any more DIY cabs finished? In process? Thinking about? New threads to link?
  #18  
Old 03-04-2013, 11:30 PM
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I did this really ugly 2x15 thread as a experiment

Have a extra pair of Eminence 3015's
and plan on starting the 2x15 build tomorrow.

Thread will follow of course.
This one is serious build too.
  #20  
Old 03-16-2013, 12:32 AM
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Join Date: Apr 2003
Location: Boulder Suburbia, Colorado
I inherited an old Traynor 2x15 PA cab. I bought some re-coned EV Force 15s. I added some batting, plugged one of the 1/4" holes in the cab and added the EVs. At low volume, the cab sounds awesome. At high volume it sounds like it's falling apart.

Then I did something... Plugged my son's Epi Valve jr into the 2x15 and holy crap it sounds awesome! So awesome that I can't wait to get another guitar head & run it through that cab. Little discoveries like that are kinda fun.
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