plan measurements
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- Posts: 572
- Joined: Sat Jan 26, 2013 5:50 pm
- Location: Brisbane, Australia
plan measurements
Hi, keen to order plans for various horns, just wondering if they are available in metric measurement? I'm australian and so over the horrible things that pass for enclosures here!
AT8 14", AT10 19", T30 28" LAB12, T48 36" 3015LF, THT 20" LAB15, SLA 4x3"/4x4", CArray 6x4", TLAH, TLAP, J10 FA, J12 FA, OT8 CD, OT12 FA, OT15 CD, SLAP 2x6"/4x6", WH8, DR280 MA, XF210. Next J10L
- Harley
- Posts: 5758
- Joined: Mon May 08, 2006 2:45 pm
- Location: Christchurch, New Zealand - Authorised BFM Cab Builder
Re: plan measurements
Welcome Keryn.

It's Ok....we understand.....it wll turn out fine in the endKeryn wrote: I'm australian ....

- Rune Bivrin
- Posts: 521
- Joined: Tue Aug 19, 2008 5:42 pm
- Location: Stockholm, Sweden
Re: plan measurements
I feel your pain, but the best option is really to get a few steel rulers with inches on one side and metric on the other. Translating the measurements turn them into really ugly numbers. But you can always display the SketchUp models in metric if so inclined.
In build order:
O12 with no tweeter.
3 x WedgeHorns.
2 x Jack 10 without tweeters.
2 x DR250.
2 x 16" T39
1 x Tuba 24
2 x SLA Pro (sort of...)
O12 with no tweeter.
3 x WedgeHorns.
2 x Jack 10 without tweeters.
2 x DR250.
2 x 16" T39
1 x Tuba 24
2 x SLA Pro (sort of...)
-
- Posts: 6912
- Joined: Mon Nov 28, 2011 11:12 am
- Location: Ilfracombe Queensland Australia
- Contact:
Re: plan measurements
G'day Keryn,
And Welcome
Happy Aussie day weekend!
I'm a bit fortunate, I was raised on the cusp of metric and imperial, but I understand.
Go to your local big markets (if you have such a thing lol), buy a 40 inch steel ruler for no more than $30. Now you can do the plans in inches and stop all that conversion issue...
If you turn the ruler over it will be in mm.
Yep, you can use sketchup to go to mm if that's all you know.
However, if you don't know mm and inches:
1 inch = 25.4mm
1/8" = 3.2mm, or .125 inches (err 1 divided by eight = .125)
ps we're not serial killers, please put your location in your profile and a local Aussie might be able to help, or let you get to listen to some of Bill's designs before your own build...
If you get stuck, give me a yell
And Welcome

Happy Aussie day weekend!
I'm a bit fortunate, I was raised on the cusp of metric and imperial, but I understand.
Go to your local big markets (if you have such a thing lol), buy a 40 inch steel ruler for no more than $30. Now you can do the plans in inches and stop all that conversion issue...
If you turn the ruler over it will be in mm.
Yep, you can use sketchup to go to mm if that's all you know.
However, if you don't know mm and inches:
1 inch = 25.4mm
1/8" = 3.2mm, or .125 inches (err 1 divided by eight = .125)
ps we're not serial killers, please put your location in your profile and a local Aussie might be able to help, or let you get to listen to some of Bill's designs before your own build...
If you get stuck, give me a yell

Built:
DR 250: x 2 melded array, 2x CD horn, March 2012 plans.
T39's: 4 x 20" KL3010LF , 2 x 28" 3012LF.
WH8: x 6 with melded array wired series/parallel.
Bunter's Audio and Lighting "like"s would be most appreciated...
DR 250: x 2 melded array, 2x CD horn, March 2012 plans.
T39's: 4 x 20" KL3010LF , 2 x 28" 3012LF.
WH8: x 6 with melded array wired series/parallel.
Bunter's Audio and Lighting "like"s would be most appreciated...
Re: plan measurements
One of the things that helped with my Jack110Lite Speed Build is the use of a Measuring Stick, aka Story Stick.
Just make absolutely sure that your Measurements are correct because everthing wll be based on it.
When I get around to more cabs, I'll make up one of these all the time.
Just make absolutely sure that your Measurements are correct because everthing wll be based on it.
When I get around to more cabs, I'll make up one of these all the time.
Wedgehorn 6 (x2)
Jack 110 Lites (x2)
XF212 (Egnater style)
DR200 ASD (Yes! Finally!)
Jack 110 Lites (x2)
XF212 (Egnater style)
DR200 ASD (Yes! Finally!)
- Bas Gooiker
- Posts: 752
- Joined: Fri Jul 06, 2012 5:05 pm
Re: plan measurements
Hey Keryn, welcome to the forum.
What kind of cabinets are you looking at? Subwoofers, tops or fullrange?
Hard to find an imperial ruler in the civilized world, but they are out there. As you progress during your build at some point it will start to make sense to you.
What kind of cabinets are you looking at? Subwoofers, tops or fullrange?
+1Rune Bivrin wrote:I feel your pain, but the best option is really to get a few steel rulers with inches on one side and metric on the other. Translating the measurements turn them into really ugly numbers. But you can always display the SketchUp models in metric if so inclined.
Hard to find an imperial ruler in the civilized world, but they are out there. As you progress during your build at some point it will start to make sense to you.
Life is just a game, don't take it to seriously!
- Rune Bivrin
- Posts: 521
- Joined: Tue Aug 19, 2008 5:42 pm
- Location: Stockholm, Sweden
Re: plan measurements
I found my steel rulers (and my freedom) at Hornbach. Somehow it makes sense to manufacture these things with both systems, one on each side. That gets you a global product with minimal extra cost.
In build order:
O12 with no tweeter.
3 x WedgeHorns.
2 x Jack 10 without tweeters.
2 x DR250.
2 x 16" T39
1 x Tuba 24
2 x SLA Pro (sort of...)
O12 with no tweeter.
3 x WedgeHorns.
2 x Jack 10 without tweeters.
2 x DR250.
2 x 16" T39
1 x Tuba 24
2 x SLA Pro (sort of...)
- LelandCrooks
- Posts: 7242
- Joined: Thu May 04, 2006 9:36 am
- Location: Midwest/Kansas/Speaker Nirvana
- Contact:
Re: plan measurements
I even use them with it on both sides. Some things are easier in the metric system. But not all, imperial has some advantages. Mostly I can do it in my head.
If it's too loud, you're even older than me! Like me.
http://www.speakerhardware.com
http://www.speakerhardware.com
- Charles Jenkinson
- Posts: 1127
- Joined: Sat Aug 06, 2011 3:25 pm
- Location: Manchester, UK
Re: plan measurements
FWIW, I think combined resolution and accuracy are easier and quicker in a base 10 metric system, but i also like how Bills plans (at least the few I have) don't use increments of less than 1/8", which makes application of the inch system straightforward.
2xJ12L (3012HO) switchable/melded
2xT30
Words&graphics - Audio&Acoustics - Hardware&DSP; 3 different paradigms.
2xT30
Words&graphics - Audio&Acoustics - Hardware&DSP; 3 different paradigms.
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- Posts: 572
- Joined: Sat Jan 26, 2013 5:50 pm
- Location: Brisbane, Australia
Re: plan measurements
As outsiders, how do you guys view the human race?Harley wrote:It's Ok....we understand.....it wll turn out fine in the end

Gday mate, nearly all of them as it turns out!Bas Gooiker wrote:What kind of cabinets are you looking at?
Still nothing...Bas Gooiker wrote:As you progress during your build at some point it will start to make sense to you.
That was the key for a while at the start to get used to inches, it was like trying to think in another language.LelandCrooks wrote:I even use them with it on both sides.
AT8 14", AT10 19", T30 28" LAB12, T48 36" 3015LF, THT 20" LAB15, SLA 4x3"/4x4", CArray 6x4", TLAH, TLAP, J10 FA, J12 FA, OT8 CD, OT12 FA, OT15 CD, SLAP 2x6"/4x6", WH8, DR280 MA, XF210. Next J10L
- BrentEvans
- Posts: 3041
- Joined: Thu Oct 09, 2008 10:38 am
- Location: Salisbury, NC
Re: plan measurements
Metric is easier to add and subtract, since it's all decimals and each dimension is ten of the previous. Imperial is easier to divide, since many of the dimensions are based on 12 (or a multiple of 12). This makes divisions by 1/2, 1/3, 1/4, 1/6, 1/8, 1/12, 1/16, 1/24, 1/32 (etc) easy. Sure we leave out 1/5 and 1/7 and 1/9 but I've never needed a seventh or ninth in anything but music chords and the truth is, if you need a fifth of something you're probably going to be drunk very soon and don't need to be using power tools so it doesn't matter anyway.LelandCrooks wrote:I even use them with it on both sides. Some things are easier in the metric system. But not all, imperial has some advantages. Mostly I can do it in my head.
99% of the time, things that aren't already being done aren't being done because they don't work. The other 1% is split evenly between fools and geniuses.
- FrankORandle
- Posts: 61
- Joined: Wed Mar 04, 2015 8:40 am
- Location: Peoria, Illinois, USA
- Contact:
Re: plan measurements
Use an online converter with your plans at your side and start converting numbers and writing the metric numbers on your plans next to the English measurements. You will have to change things like 24 1/2 to 24.5, 24 3/4 to 24.75 and so on.
https://www.google.com/webhp?sourceid=c ... entimeters
https://www.google.com/webhp?sourceid=c ... entimeters
2-TTLS w/Dayton RSS265HO-4 10" Reference HO Subwoofer
- Bill Fitzmaurice
- Site Admin
- Posts: 28968
- Joined: Tue May 02, 2006 5:59 pm
Re: plan measurements
Or do what it says in the plans and measure the parts in your Sketchup models with the readout in metric.FrankORandle wrote:Use an online converter with your plans at your side and start converting numbers and writing the metric numbers on your plans next to the English measurements.

-
- Posts: 572
- Joined: Sat Jan 26, 2013 5:50 pm
- Location: Brisbane, Australia
Re: plan measurements
Yep, tried that, got bored of it real quick!FrankORandle wrote:writing the metric numbers on your plans
So I just bought
and got on withGrant Bunter wrote:a 40 inch steel ruler
Well, y'no.... I've made a few mistakes ay!Bill Fitzmaurice wrote:what it says in the plans
AT8 14", AT10 19", T30 28" LAB12, T48 36" 3015LF, THT 20" LAB15, SLA 4x3"/4x4", CArray 6x4", TLAH, TLAP, J10 FA, J12 FA, OT8 CD, OT12 FA, OT15 CD, SLAP 2x6"/4x6", WH8, DR280 MA, XF210. Next J10L
- Harley
- Posts: 5758
- Joined: Mon May 08, 2006 2:45 pm
- Location: Christchurch, New Zealand - Authorised BFM Cab Builder
Re: plan measurements
With our eyes...Keryn O'Shea wrote:As outsiders, how do you guys view the human race?Harley wrote:It's Ok....we understand.....it wll turn out fine in the end.