Here's a quad speaker tapped horn I'm about to start. It's intended to be used in groups of 4. I will be using Lab12's for now as I already have them but will later upgrade to the B&C 12PS100's for smoother response and greater efficiency. If there is a flaw in my design, please do tell. Any advice is appreciated.
See pics of HornResponse simulation and plans. The grey line is the 12PS100's. Internal width is 48" chosen for easy of build. I've also included a zip file with the plans made from Google Sketchup here http://www.diyaudio.com/forums/attachment.php?attachmentid=146612&stc=1&d=1258083654
See pics of HornResponse simulation and plans. The grey line is the 12PS100's. Internal width is 48" chosen for easy of build. I've also included a zip file with the plans made from Google Sketchup here http://www.diyaudio.com/forums/attachment.php?attachmentid=146612&stc=1&d=1258083654
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Ok, where's the shootout! 
lol
I don't have equipment to do measurements but using sine waves, it's good down to 45hz in my backyard, nearest wall is about 15ft. 40hz sounds about 6 db down but that can be eq'ed back in. It's pretty loud on a 4000w amp with lot of punch. It's hard to stand in front this thing at full volume with a 50hz sine. I underestimated the weight maybe 300+ pounds, it takes 3 of us to move it around. Looks like my horizontal bracing scheme (8 inches apart) worked well. I'm wondering if I should add bracing closer to the mouth to connect both walls. Also, have you guys ever experienced leaking t-nuts? I might just add some PL adhesive to them before I install the drivers permanently.
lolI don't have equipment to do measurements but using sine waves, it's good down to 45hz in my backyard, nearest wall is about 15ft. 40hz sounds about 6 db down but that can be eq'ed back in. It's pretty loud on a 4000w amp with lot of punch. It's hard to stand in front this thing at full volume with a 50hz sine. I underestimated the weight maybe 300+ pounds, it takes 3 of us to move it around. Looks like my horizontal bracing scheme (8 inches apart) worked well. I'm wondering if I should add bracing closer to the mouth to connect both walls. Also, have you guys ever experienced leaking t-nuts? I might just add some PL adhesive to them before I install the drivers permanently.
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OK
I am going to be the one who says it. This is a WASTE. Just by going with the HR data you are looking at 130-133 DB output between 50-130 Hz with the -10 Db being 40Hz.
At 200 ish pounds and $1000 to construct...
You will be better off putting them
into either the LAB12 sub or the single driver version of it. Or a layout similar to JBells Dual MCM FLH.
I have said it before,
the lab 12 driver isn't a good Th driver.
Oh and I did my own HUGE Lab 12 sub
as a test. Though dual and going into the subsonics. ( http://worldconspiracy.org/speakers/DualLabTestBox-1.JPG ) FYI - that is a full sheet on each side. I only spent $20 bucks on it so it wasn't a big deal to cut it up.
I am going to be the one who says it. This is a WASTE. Just by going with the HR data you are looking at 130-133 DB output between 50-130 Hz with the -10 Db being 40Hz.
At 200 ish pounds and $1000 to construct...
You will be better off putting them
into either the LAB12 sub or the single driver version of it. Or a layout similar to JBells Dual MCM FLH.
I have said it before,
the lab 12 driver isn't a good Th driver.
Oh and I did my own HUGE Lab 12 sub
as a test. Though dual and going into the subsonics. ( http://worldconspiracy.org/speakers/DualLabTestBox-1.JPG ) FYI - that is a full sheet on each side. I only spent $20 bucks on it so it wasn't a big deal to cut it up.
lab12 <> good PA TH
lab12 = good PA FLH
There's a reason danley doesn't use this driver in his tapped horns.
6 cabinets of this would be easily handled, and work far better. (.5pi shows what 4 would do in a stack)
just watch that xmax spike at 38hz.
However, I appreciate seeing anyone willing to make sawdust. So, on that note, congrats on building/testing.
lab12 = good PA FLH
There's a reason danley doesn't use this driver in his tapped horns.
6 cabinets of this would be easily handled, and work far better. (.5pi shows what 4 would do in a stack)
just watch that xmax spike at 38hz.
However, I appreciate seeing anyone willing to make sawdust. So, on that note, congrats on building/testing.
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Let me elaborate...
The goal is an easy build, and at least 150db above 40hz from 8'w x 4'h (back of flatbed). I'm using my modded Labsub for comparison so it has to do better than my Lab.
This trapezoid sub will be used in groups of 4. I'm using the Lab12 because these are the drivers I own. 19 to be exact. Below is the HR data with 1.73 volts for 1w/3ohms in half space. The dark line is a single and grey is four
After 4 is complete, I'll be switching to drivers that work better in this enclosure of course. Other groups with different speakers will cover the left and right sides. Hopefully there will be minimal interferance with some signal processing.
FlipC, how did you get 130-133db maximum output? What works for me, may not work for you and vice versa. So, I wouldn't knock this design.
JBell, 6 of those conventional horns is double the size of my enclosure. However, thanks for the support.
The goal is an easy build, and at least 150db above 40hz from 8'w x 4'h (back of flatbed). I'm using my modded Labsub for comparison so it has to do better than my Lab.
This trapezoid sub will be used in groups of 4. I'm using the Lab12 because these are the drivers I own. 19 to be exact. Below is the HR data with 1.73 volts for 1w/3ohms in half space. The dark line is a single and grey is four
After 4 is complete, I'll be switching to drivers that work better in this enclosure of course. Other groups with different speakers will cover the left and right sides. Hopefully there will be minimal interferance with some signal processing.
FlipC, how did you get 130-133db maximum output? What works for me, may not work for you and vice versa. So, I wouldn't knock this design.
JBell, 6 of those conventional horns is double the size of my enclosure. However, thanks for the support.
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I was using your original HR inputs.
Not the revised. Though I corrected the driver arrangement to 3 series x 3 parallel drivers (6 total not 4 as initial list). But I just noticed I didn't reset the max voltage. So I just ran the newer layout. Corrected for # of drivers (3S x 3P)
Corrected for 1 watt of input (3.62v) 58Hz at 110. -10 down at 44Hz. Sharp 48Db cut at 33 Hz. Which at 230v gives you 127 Db at 33 hz. 136 Db at 44 and 146at 58Hz. Single cabinet. If you build 3 (18 of your 19 drivers) you get an extra 5 Db while moving the freq range down 5 Hz for peaks. At just over 500 Lt, not bad really. Specially since you already have the drivers.
Though that is 4K plus watts per cabinet.
Some 20K for all 3 to hit Max SPL at 53 Hz. Even though the TH design helps in this department, will the coils actually be able to cope?
So I want some test!
Even if you have to use a RadShack meter. I'm interested in the real world outcome.
Not the revised. Though I corrected the driver arrangement to 3 series x 3 parallel drivers (6 total not 4 as initial list). But I just noticed I didn't reset the max voltage. So I just ran the newer layout. Corrected for # of drivers (3S x 3P)
Corrected for 1 watt of input (3.62v) 58Hz at 110. -10 down at 44Hz. Sharp 48Db cut at 33 Hz. Which at 230v gives you 127 Db at 33 hz. 136 Db at 44 and 146at 58Hz. Single cabinet. If you build 3 (18 of your 19 drivers) you get an extra 5 Db while moving the freq range down 5 Hz for peaks. At just over 500 Lt, not bad really. Specially since you already have the drivers.
Though that is 4K plus watts per cabinet.
Some 20K for all 3 to hit Max SPL at 53 Hz. Even though the TH design helps in this department, will the coils actually be able to cope?
So I want some test!
Even if you have to use a RadShack meter. I'm interested in the real world outcome.
Actually, it would be 2 series x 3 parallel for 6 drivers. 3x3 would be 9. The revised data is from actual measurements so it should be accurate.
As for tests, I don't have a measurement mic or software. I've tried Praxis for impedance, but it seems very complicated even to get it calibrated correctly. If there's a cheap solution, please walk me through it. I live in South Florida and sent an email to screamsusa but never got a response. Anyone else down these neck of the woods that wants to link?
BTW, has there ever been a DIY sub shootout? I took a pair of my Labs to the NYC shootout back in 2007. Measurement was done on 1 sub with my drivers wired in series per enclosure. Voltage was 2.83, see below.
As for tests, I don't have a measurement mic or software. I've tried Praxis for impedance, but it seems very complicated even to get it calibrated correctly. If there's a cheap solution, please walk me through it. I live in South Florida and sent an email to screamsusa but never got a response. Anyone else down these neck of the woods that wants to link?
BTW, has there ever been a DIY sub shootout? I took a pair of my Labs to the NYC shootout back in 2007. Measurement was done on 1 sub with my drivers wired in series per enclosure. Voltage was 2.83, see below.
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