Church sub project

burdette · 10-18-2005, 11:54 PM

Thought I'd share a couple of construction pics of the sub I'm building for our church.

For size reference, notice my full-sized BD drill and a CD. The cabinet doesn't have to be pretty - it will be covered with carpet, complete with road handles, protective corners, a castored base, etc. It DOES have to be a tank - I'm not done with the internal bracing yet.

Peavey 18" Lowrider; 9ft3 acoustic volume, 5.5"x10"x12.5" port; 1000w amp.

First pic is front of baffle; second pic is driver (with a CD); third pic is rear of baffle - you can see the second-layer "inset" panel screwed to the outer baffle, which has the nest for the port. This will get a layer of plywood over it for the driver screws to bite.

PolkThug · 10-19-2005, 01:22 AM

Your church will be boomin' in no time!

ohskigod · 10-19-2005, 01:33 AM

The Church of House, Techno, and Latter Day Saints!!!

Schris22 · 10-19-2005, 02:47 AM

impressive!

always good to add a lil thump to your prayer!

Chris

Tritonman · 10-19-2005, 02:02 PM

You heard it here...God love's Bass

madmax · 10-19-2005, 03:37 PM

I'm sure you already have this but just in case...

http://img3.musiciansfriend.com/dbas...pec/661354.pdf

madmax

amulford · 10-20-2005, 05:45 AM

I hope you reinforced the stained glass windows...

burdette · 10-20-2005, 10:03 AM

Quote:

Originally Posted by amulford

I hope you reinforced the stained glass windows...

Funny you should say that. The tech sheet on the driver (the same one Max linked to) specifically has a disclaimer about *structural damage* to your facility. Peavey is telling you before hand "don't sue US if your building falls down around your sub."

madmax · 10-20-2005, 11:14 AM

I know what the specs says and all but I bet it will be like a pro JBL sub driver I tried. Not really a sub as we know it but a very good bass speaker. Let us know how it turns out.
madmax

burdette · 10-20-2005, 12:54 PM

Well, we're not looking for response to 15hz for home theater. The goal is to fill in the bottom end on the bass guitar and electric piano/organ for a large room.

Peavey calls the driver a "subwoofer", which is probably why I'm using that term. The tuning will be around 30Hz, which is below the average full-range system. Heck, that is lower than a lot of "subwoofers" out there.

But overall I'd agree with you... low-bass sound reinforcement.

madmax · 10-20-2005, 01:26 PM

The JBL I tried was put in one of those "Voice of the Theater" boxes. I crossed it over just like I would an ordinary sub and although it produced a lot of bass it didn't "seem" very loud. The test was done in my basement and it ripped loose my water pipes. I guess at the right frequency they started moving like a guitar string. Funny but it ripped certain ones loose and others stayed attached. I'm guessing that the pipes really did act like guitar strings which means some parts were moving and others were stationary. Luckily no harm was done, I just nailed the holders back in.

I sure it will sound good for you. You should get a lot of output with the 97db eff. Good luck!
madmax

amulford · 10-21-2005, 11:08 AM

Well, I am only partially kidding. The sheer force of the low freq wave will rattle the windows. Since stained glass is made the way it is, you could conceivably rattle it loose if your not careful. It dosen't have to be cranked to have the effect...

burdette · 10-21-2005, 05:33 PM

Oh, I agree with you. I know how a good sub can shake things up. Anyone who's been in a house when a dump truck (etc) passes by and the house starts shaking can attest to the power of low-frequency sound energy. Shoot - they use it to bust up kidney stones.

As I said, Peavey specifically speaks to potential structural damage.

Fortunately for this project - at least for now - this church has a long-term building plan, and for now meets in what will eventually be the "recreation room". No stained glass windows. In fact, few windows at all. Just really tall cinder-block walls.

10-18-2005, 11:54 PM	#1
burdette Polkhead Member Sales Rating: (1) Join Date: Jul 2001 Location: LR, AR Posts: 1,189	Church sub project Thought I'd share a couple of construction pics of the sub I'm building for our church. For size reference, notice my full-sized BD drill and a CD. The cabinet doesn't have to be pretty - it will be covered with carpet, complete with road handles, protective corners, a castored base, etc. It DOES have to be a tank - I'm not done with the internal bracing yet. Peavey 18" Lowrider; 9ft3 acoustic volume, 5.5"x10"x12.5" port; 1000w amp. First pic is front of baffle; second pic is driver (with a CD); third pic is rear of baffle - you can see the second-layer "inset" panel screwed to the outer baffle, which has the nest for the port. This will get a layer of plywood over it for the driver screws to bite. Attached Thumbnails __________________ Hew to the line, and let the chips fall where they may. HT: RT55i, CS400, Monitor 5jr+, Stryke 12" sonosub (flat to 15Hz) LR: Monitor 5jr+ Kitchen: M2 Last edited by burdette; 10-19-2005 at 12:00 AM..

10-19-2005, 01:33 AM	#3
ohskigod Polk Master Member Sales Rating: (4) Join Date: Jun 2003 Location: northern nj Posts: 5,439	The Church of House, Techno, and Latter Day Saints!!! __________________ Theater - Polk LSi15, LSiC, LSi9 speaks, DIY Sub (142.5L box, SVS plus driver, 500 Watt plate amp)...Outlaw 990 pre/pro, Carver TFM45, 2 X Outlaw M200 . Rotel RB980 . PS3, Monster 3600 power center 2 Channel - Promithius TVC passive Pre, Jolida JD100 CD player, CAL Sigma DAC, Carver m4.0, Carver Amazings Office - Anthem Amp 1, Anthem Pre 2l, CAL DX1 (CD), Rogers LS6 monitors

10-19-2005, 02:47 AM	#4
Schris22 Polkazoid Member Sales Rating: (1) Join Date: Apr 2005 Location: Houston/San Antonio (College) Posts: 998	impressive! always good to add a lil thump to your prayer! Chris __________________ Receiver: Onkyo TX-SR502-S DVD Player: Pioneer DV-578A-S Left and Right: R50 Center: CS1 Rear Center: R15 Surrounds: R30 Subwoofer: 10'' Dayton 100 Watt

10-19-2005, 03:37 PM	#6
madmax Polk Guru Member Sales Rating: (13) Join Date: Jul 2001 Location: Northern Colorado Posts: 9,983	I'm sure you already have this but just in case... http://img3.musiciansfriend.com/dbas...pec/661354.pdf madmax __________________ Vinyl, the final frontier... Avantgarde horns, 300b tubes, thats the kinda crap I want...

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10-19-2005, 01:22 AM	#2
PolkThug Polk Guru Member Sales Rating: (2) Join Date: Sep 2003 Location: Kansas Posts: 7,554	Your church will be boomin' in no time!

10-19-2005, 02:02 PM	#5
Tritonman Polkster Member Sales Rating: (0) Join Date: Sep 2005 Location: Upstate, NY Posts: 159	You heard it here...God love's Bass

10-20-2005, 11:14 AM	#9
madmax Polk Guru Member Sales Rating: (13) Join Date: Jul 2001 Location: Northern Colorado Posts: 9,983	I know what the specs says and all but I bet it will be like a pro JBL sub driver I tried. Not really a sub as we know it but a very good bass speaker. Let us know how it turns out. madmax

10-20-2005, 12:54 PM	#10
burdette Polkhead Member Sales Rating: (1) Join Date: Jul 2001 Location: LR, AR Posts: 1,189	Well, we're not looking for response to 15hz for home theater. The goal is to fill in the bottom end on the bass guitar and electric piano/organ for a large room. Peavey calls the driver a "subwoofer", which is probably why I'm using that term. The tuning will be around 30Hz, which is below the average full-range system. Heck, that is lower than a lot of "subwoofers" out there. But overall I'd agree with you... low-bass sound reinforcement.

10-20-2005, 01:26 PM	#11
madmax Polk Guru Member Sales Rating: (13) Join Date: Jul 2001 Location: Northern Colorado Posts: 9,983	The JBL I tried was put in one of those "Voice of the Theater" boxes. I crossed it over just like I would an ordinary sub and although it produced a lot of bass it didn't "seem" very loud. The test was done in my basement and it ripped loose my water pipes. I guess at the right frequency they started moving like a guitar string. Funny but it ripped certain ones loose and others stayed attached. I'm guessing that the pipes really did act like guitar strings which means some parts were moving and others were stationary. Luckily no harm was done, I just nailed the holders back in. I sure it will sound good for you. You should get a lot of output with the 97db eff. Good luck! madmax

10-21-2005, 11:08 AM	#12
amulford Polk Expert Member Sales Rating: (3) Join Date: May 2003 Location: Southern New Jersey Posts: 4,369	Well, I am only partially kidding. The sheer force of the low freq wave will rattle the windows. Since stained glass is made the way it is, you could conceivably rattle it loose if your not careful. It dosen't have to be cranked to have the effect...

10-21-2005, 05:33 PM	#13
burdette Polkhead Member Sales Rating: (1) Join Date: Jul 2001 Location: LR, AR Posts: 1,189	Oh, I agree with you. I know how a good sub can shake things up. Anyone who's been in a house when a dump truck (etc) passes by and the house starts shaking can attest to the power of low-frequency sound energy. Shoot - they use it to bust up kidney stones. As I said, Peavey specifically speaks to potential structural damage. Fortunately for this project - at least for now - this church has a long-term building plan, and for now meets in what will eventually be the "recreation room". No stained glass windows. In fact, few windows at all. Just really tall cinder-block walls.

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