OT12’s and T48’s

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Preston
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Location: Springfield, IL

OT12’s and T48’s

#1 Post by Preston »

I remembered to snap a hasty picture of one of my two BFM rigs in action this past weekend. 4 x OT12 per side and 6 T48 center cluster. Here I’m using a pair of 36” and 4 18”. You can also see a pair of WH8 on stage.
I can’t say enough about how good this rig sounds. I’d like to have a little more height on the tops, but I walked back a full city block and the sound was still excellent.
I’ve been gigging a BFM system for several years now and continue to get compliments (and more work) because of the quality.
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Tom Smit
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Re: OT12’s and T48’s

#2 Post by Tom Smit »

That's awesome! Thanks for sharing!
TomS

Preston
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Location: Springfield, IL

Re: OT12’s and T48’s

#3 Post by Preston »

“Rock The Dock” last night. 4 x 36” + 4 x 18” T48s and 4 x OT12 per side. Sounded pretty good…
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J_Dunavin
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Re: OT12’s and T48’s

#4 Post by J_Dunavin »

Man I bet that group of T48s sound great!
What’s the rest of the rig, amps, Driverack, mixing board?
2 - OTop8
2 - T39
8 - DR200
2 - DR250
9 - T24
6 - T45
1 - Auto Tuba

Preston
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Location: Springfield, IL

Re: OT12’s and T48’s

#5 Post by Preston »

Midas M32 with DL32 stagebox, Driverack, QSC CX 702 on tops, QSC 902 on subs. I have a “spare” amp rack full of various Crown, QSC, Behringer, and Peavey amps also if I need to split the load or minimize speaker cable runs.
Mostly Audix and SE mics.

Preston
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Location: Springfield, IL

Re: OT12’s and T48’s

#6 Post by Preston »

There was a very prominent power alley from the subs. I should have probably build two V stacks separated 50ft.
Hindsight….
We were hitting 125dB Cweighted at FOH (75 feet back) during our system check.

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Seth
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Re: OT12’s and T48’s

#7 Post by Seth »

I'm loving these reports Preston :thumbsup:

Interesting results, with the power alley. I'm thinking, in that specific deployment, your sub array is 18 feet wide and it wouldn't technically be a power alley, so much as you're likely getting directivity above 60ish Hz... I think. I could be wrong on that.

I've been searching for the answer and can't find it... Bill, is it one wavelength wide to get directivity out of a horizontal sub array?

In separating and stacking them on opposite sides of the stage, you'll want them to be separated by at least 2 wavelengths of the lowest frequency you intend on reproducing. The speed of sound in feet or meters per second divided by the lowest frequency gives you the wavelength. Multiply by 2 to get two wavelengths.

1125fps ÷ 35Hz = 32.14feet x 2 = 64.28 feet (64' 3") between stacks. 50' would be okay for a 45Hz bottom frequency.

... by the book anyway. What works good (or good enough), venue to venue, in real world scenario's is best sorted through testing.
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

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Seth
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Re: OT12’s and T48’s

#8 Post by Seth »

Or maybe try a curved array? The image below illustrates what you may have been experiencing along with the calculated results of a curved array. Looks like it could possibly smooth out your coverage considerably.


Screenshot (196).png


Image above is from the following link, a good read on subwoofer arrays.
Electro-Voice Subwoofer Arrays A practical Guide



.
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

Preston
Posts: 194
Joined: Mon Apr 14, 2008 3:59 pm
Location: Springfield, IL

Re: OT12’s and T48’s

#9 Post by Preston »

I’ll be deploying the same rig next weekend for “Sweetcorn Fest” so I’ll try a curve and see if there’s much difference. I’ve got 4 more 24” T48s in a temporary install that I’m itching to add to the pile….

I’ve also been curious about Cartoid deployment. I’m unsure if it’s even possible with horns. Can anyone shed any light?

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Bill Fitzmaurice
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Re: OT12’s and T48’s

#10 Post by Bill Fitzmaurice »

Cardioid will work with any subs, but beware of the loss of axial sensitivity at lower frequencies.

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