DIY surround in a narrow column - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 13 Old 06-20-2019, 02:22 PM - Thread Starter
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DIY surround in a narrow column

I recently purchased a pair pf JBL SP8ii and SP6ii in-walls to go with JBL in-ceiling SP8Cii Atmos speakers, but in prepping to install I am just not satisfied with the placement those dimensions would require on the walls (stud placement). I am now considering building a DIY speaker into columns that will be easier to place optimally. I looked at the DIY Soundgroup micro-size listings and the Quark or Ion 4 Plus might do it, but the power handling is quite low for those. My amp is 200wpc for the side and rear channels.

I'd like to keep the width of the rear to 5 inches, and the side columns could be a little wider if necessary. Any suggestions? Should I do a couple of woofers in array to increase powerhandling and performance and stay that narrow?

I'm not looking for perfection - its not a long-term solution - but it would be nice to get some experience with a custom build. The front sound stage is all B&W Kevlar units (circa 2003 800 series nautilus), if that steers toward a driver type. I have had to replace two tweeters from B&W parts, so I also considered looking through their site for old components I might buy as well, but Parts Express is more my budget for this experiment!

I saw a good build thread where someone cannibalized existing speakers and remounted the parts, but all the candidates I have are too wide.

How would you build a 5 inch wide column, with speaker on that face?
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post #2 of 13 Old 06-20-2019, 05:15 PM
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cn you serve up any kind of a picture / pencil /crayon depiction?

placement of the speaker and even the column wrt mlp?

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post #3 of 13 Old 06-20-2019, 06:41 PM - Thread Starter
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Quote:
Originally Posted by asarose247 View Post
cn you serve up any kind of a picture / pencil /crayon depiction?

placement of the speaker and even the column wrt mlp?
It seems I don't have SketchUp on this PC and I am not making much sense in the MS paint app, so a drawing will have to wait. I found the post that inspired me though, so this should give some idea:

https://www.avsforum.com/forum/19-de...l#post56042224

My side columns will go a few degrees behind MLP and the rears will be a few feet apart about the same distance behind. The reason for the narrow rears is that the rear of the room is open and the only reasonable position is on the walls of the stairwell that comes down in the back of the room. The walls are 5 inches wide, and staying within that width will be aesthetically acceptable for my wife without any additional convincing.

I realize most people would just go for 5.1.4 and forget 7.1.4, but I have the equipment and would rather have suboptimal rears than none.
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post #4 of 13 Old 06-21-2019, 02:29 PM
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I just hung 8330a's from the ceiling, people think I'm crazy until I say "that's what commercial theaters used", then I'm still crazy...sooo.

Go big or go home (theater in a box). Surrounds arnt something you want to skimp on. I think it's better to show case them than it is to sacrifice function over form. But I'm single so I dont even consider waf.

A line array would be smart too.

- 6 BA CR6 array center channel, QSC AD-S82 L/R, 4 jbl 8330a surr , 8 jbl 12" subs w/Inuke 6000. JVC rs420, Denon x4000, Sony x800 -
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post #5 of 13 Old 06-21-2019, 02:41 PM - Thread Starter
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Quote:
Originally Posted by trilkb View Post
I just hung 8330a's from the ceiling, people think I'm crazy until I say "that's what commercial theaters used", then I'm still crazy...sooo.

Go big or go home (theater in a box). Surrounds arnt something you want to skimp on. I think it's better to show case them than it is to sacrifice function over form. But I'm single so I dont even consider waf.

A line array would be smart too.
Can't go big or I would walk into them. I'm 6'6" and the ceiling is under 8 feet. I either eliminate them and stick with 5.1.4 or I find a narrow solution.
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post #6 of 13 Old 06-21-2019, 03:16 PM
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Yup. I'm 6 2 and my ceiling is under 7 feet. I just deal with it lol my head is even with the top of them.
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- 6 BA CR6 array center channel, QSC AD-S82 L/R, 4 jbl 8330a surr , 8 jbl 12" subs w/Inuke 6000. JVC rs420, Denon x4000, Sony x800 -
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post #7 of 13 Old 06-23-2019, 01:48 AM - Thread Starter
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The line arrays I can find reference to here are monstrous, with dozens if not hundreds of drivers. Is there a design I can follow with fewer, but still small, drivers?
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post #8 of 13 Old 06-23-2019, 11:11 AM
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surf on over to the site for Bill fitzmaurice


he has plans for SHORT line arrays, SLA's, as small as 4 of 3 or 4' drivers and some tweeters . .

for both mains and CC

and the instructions and support for a build are world class

https://billfitzmaurice.info/SLA.html

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post #9 of 13 Old 06-24-2019, 09:40 AM
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What about these: https://www.jblpro.com/www/products/installed-sound/cbt-series/cbt50la-1#.XRD8puR8C1s
I picked up two for $350 on eBay. They are great for surround duty.
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post #10 of 13 Old 06-28-2019, 11:43 AM - Thread Starter
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Quote:
Originally Posted by Wrager View Post
What about these: https://www.jblpro.com/www/products/installed-sound/cbt-series/cbt50la-1#.XRD8puR8C1s
I picked up two for $350 on eBay. They are great for surround duty.
That seems like just the thing, actually, but the price is out of line with the value (for me) in the least used channel. How could I DIY something similar?
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post #11 of 13 Old 06-28-2019, 12:06 PM - Thread Starter
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Quote:
Originally Posted by asarose247 View Post
surf on over to the site for Bill fitzmaurice


he has plans for SHORT line arrays, SLA's, as small as 4 of 3 or 4' drivers and some tweeters . .

for both mains and CC

and the instructions and support for a build are world class

https://billfitzmaurice.info/SLA.html
Thanks, I saw Bill's bigger arrays and not this one. Page says there is a surround model with 2" drivers, perhaps similar to that JBLpro. Unfortunately Bill's marketing is lacking, with no info on any of the designs, just a request for $15 for details. Fishing through his forum for info...
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post #12 of 13 Old 06-28-2019, 01:12 PM
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Quote:
Originally Posted by ScottAvery View Post
Thanks, I saw Bill's bigger arrays and not this one. Page says there is a surround model with 2" drivers, perhaps similar to that JBLpro. Unfortunately Bill's marketing is lacking, with no info on any of the designs, just a request for $15 for details. Fishing through his forum for info...

Yup thats how he works, They will be included in the $15 design plans.

- 6 BA CR6 array center channel, QSC AD-S82 L/R, 4 jbl 8330a surr , 8 jbl 12" subs w/Inuke 6000. JVC rs420, Denon x4000, Sony x800 -
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post #13 of 13 Old 06-30-2019, 03:20 AM
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I would surface mount Volt 6 coaxial speakers in your enclosures. By surface mounting, you can achieve the narrowest possible enclosure width, and then adjust the depth and height to achieve the required internal volume. Although the V6 is 1" wider than your target width, I think you give up too much bass performance limiting yourself to a 5" width. The Volt 6 is rated up to 300w and is relatively sensitive at 93dB @ 1 watt/1 meter. Plenty of folks here have used volts for surround and Atmos duty and they regularly receive high praise. If you can swing the added width of the Volt 8, I think it would be a very worthwhile upgrade over the V6.

Mike

Last edited by mhutchins; 06-30-2019 at 03:24 AM.
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