Trying to dust the cobwebs off.

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Grant Bunter
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Joined: Mon Nov 28, 2011 11:12 am
Location: Ilfracombe Queensland Australia
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Re: Trying to dust the cobwebs off.

#31 Post by Grant Bunter » Tue Mar 03, 2020 3:58 pm

Mmm door, glass, therefore not a solid boundary.
What's that little alcove like in pic 2, to the right of the truss on the ceiling?
Built:
DR 250: x 2 melded array, 2x CD horn, March 2012 plans.
T39's: 4 x 20" BP102 , 2 x 28" 3012lf.
WH8: x 3 with melded array.
Bunter's Audio and Lighting "like"s would be most appreciated...

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Seth
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Location: Sacramento, California, USA
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Re: Trying to dust the cobwebs off.

#32 Post by Seth » Tue Mar 03, 2020 10:59 pm

5meohd wrote:
Tue Mar 03, 2020 2:21 pm
That corner is indeed what I was thinking. Would you try to stack all 4 subs vertically facing the corner? Or put them in a cube orientation? I wish the sub placement sticky had T60 guidelines...
Really truly, you should probably try all locations and configurations that make sense. My inclination is to stack them 4 high, aimed to the left in the position I mentioned in pic 1 and mouths about a foot away from the wall. However, it's just where's I'd start.

Scratch that... It would be smart to start with a sub crawl. Put a sub in the location you would like to sound the best and take measurements around the perimeter and corners of the room. Painters tape to mark and number the location. Then place the subs in the locations that had the highest measurements and test the target area. Also, you can place a sub in areas you would like a null or cancellation (possibly a bar or area people congregate to talk) and test the perimeter. Compare the results and try the locations that produce the best balance of both attributes, loud on the dance floor yet less so at the bar/social areas.

I just noticed the DJ booth in pic 2. That's a pretty cool set up.
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded

Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421

5meohd
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Joined: Thu Nov 18, 2010 4:47 pm

Re: Trying to dust the cobwebs off.

#33 Post by 5meohd » Wed Jun 16, 2021 8:21 am

We now have a new spot if anyone wants to help out again!

I just typed out a whole new thread only to have a glitch throw it away...

New space is concrete underground parking garage.

8'x65.5'x55'

4 T60s.. and 2 Danley Labs SH69s!!
4 T60's
4 piezo J10's

now working on a 7.1 system

Grant Bunter
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Joined: Mon Nov 28, 2011 11:12 am
Location: Ilfracombe Queensland Australia
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Re: Trying to dust the cobwebs off.

#34 Post by Grant Bunter » Wed Jun 16, 2021 4:22 pm

Windows/doors?
Pics would help...
Built:
DR 250: x 2 melded array, 2x CD horn, March 2012 plans.
T39's: 4 x 20" BP102 , 2 x 28" 3012lf.
WH8: x 3 with melded array.
Bunter's Audio and Lighting "like"s would be most appreciated...

5meohd
Posts: 104
Joined: Thu Nov 18, 2010 4:47 pm

Re: Trying to dust the cobwebs off.

#35 Post by 5meohd » Thu Jun 17, 2021 5:40 am

No Windows. 2 doors. 1 walk through and 1 large garage door.

I'll grab pictures tonight.
4 T60's
4 piezo J10's

now working on a 7.1 system

5meohd
Posts: 104
Joined: Thu Nov 18, 2010 4:47 pm

Re: Trying to dust the cobwebs off.

#36 Post by 5meohd » Sun Jun 20, 2021 3:16 am

Still failed to get shots of the big door. Dang.
4 T60's
4 piezo J10's

now working on a 7.1 system

5meohd
Posts: 104
Joined: Thu Nov 18, 2010 4:47 pm

Re: Trying to dust the cobwebs off.

#37 Post by 5meohd » Sun Jun 20, 2021 3:17 am

Having trouble posting photos.
4 T60's
4 piezo J10's

now working on a 7.1 system

mj90210
Posts: 65
Joined: Fri Feb 03, 2017 2:12 pm
Location: Montana-USA

Re: Trying to dust the cobwebs off.

#38 Post by mj90210 » Sun Jun 20, 2021 12:13 pm

What a rig you have! I would suggest using a software with a room simulator so you can see what happens to target frequencies with placement. I have used REW a handful of times and it was surprisingly accurate for the frequencies I was concerned about. Using the software and understanding the 1/4 wavelength effects is gratifying. I also like putting at least just one sub on a moving dolly, play a test tone of main frequency for music you are listening to and just wheel it around while measuring or listening in listening area, like a reverse sub crawl.

I liked pulling the T60’s away from the wall due to a smaller dance/listening areas. The boundary loading wasn’t needed due to having 4 units and dispersion/direct sound was controlled easier as well. Doing those things my main goal was not to have any cancellations or major nulls in the 35-60 hz range.

How do you like your SH69’s?!
Thank You All for Your Time!!...Really!

Built:
2xDR300's
4xDual-30” Tuba 60’s
Simplex 21" Eminence NSW6021
1x20” THT
TLAH‘S
SLA Center-9 driver and Surrounds
SLA pros
TrT 10" Driver-10" Wide
Auto Tuba 10" Driver

5meohd
Posts: 104
Joined: Thu Nov 18, 2010 4:47 pm

Re: Trying to dust the cobwebs off.

#39 Post by 5meohd » Fri Jul 23, 2021 7:17 am

The SH69s are incredible. Still learning how to use SMAART though. We are also using them in smaller spaces.. but we have moved to another new spot and finally found a bit of luck. The whole thing is finally singing.

I want to improve it further.

Do we have pre-alignment delay values for the T60? Is the horn path, as measured in Sketchup, equal to the delay value of a standard 0ms direct radiating driver was next to a Tuba "grill to grill"?

I'm learning how to read the phase graph via Nathan Lively's channel/website. But im hoping to get into the ballpark by using simple distance measurements next time I'm at the space, then following one of his guides to take a peek and see what I can learn.
4 T60's
4 piezo J10's

now working on a 7.1 system

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Radian
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Joined: Tue Jul 29, 2008 12:56 pm
Location: Tucson, AZ

Re: Trying to dust the cobwebs off.

#40 Post by Radian » Fri Jul 23, 2021 12:57 pm

If you’ve got the tools, run an impedance sweep of the subs in-place. The first peak on the way down will be Fc. Use the wavelength at Fc plus any physical distance between the sub’s mouths and tops as a starting point to set the delays in the tops.
Good food, good people, good times.

4 - AT
1 - TT
1 - THT Slim
2 - SLA Pro 4x6 Alphalite

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Bill Fitzmaurice
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Re: Trying to dust the cobwebs off.

#41 Post by Bill Fitzmaurice » Fri Jul 23, 2021 2:27 pm

The T60 path is 13 feet. Add to that the distance between the subs and mains to determine how much delay to apply to the mains if you're main concern is sub/main integration. If it's live sound the mains have to be delayed to the placement of the backline amps.

5meohd
Posts: 104
Joined: Thu Nov 18, 2010 4:47 pm

Re: Trying to dust the cobwebs off.

#42 Post by 5meohd » Sat Jul 24, 2021 4:09 pm

Thanks guys. Subs/Mains integration for sure. Thank you!
4 T60's
4 piezo J10's

now working on a 7.1 system

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