SLA Pro

For livingroom sound better than in a theatre.
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guyfeld
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Joined: Thu Sep 24, 2015 2:20 am

SLA Pro

#1 Post by guyfeld » Sun Sep 03, 2017 2:49 am

Hi, I'm keen on building a modular array like the SLA pro, but here in S Africa the Eminence drivers are hideously expensive and Goldwood piezo's just unavailable! I was wondering if I could substitute Faital's 4 FE32 full-range 4" 30w 91db sens 90-20khz drivers to make the smaller version of the SLA pro?(with no tweeters needed!)


Also, regarding the SLA pro used in spiral array config, doesn't this produce lobing if the stacked cabs are angled altenatively l/r slightly off-centre?
I would love to have 180 degree coverage from one column...

Thanks

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Chris_Allen
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Location: Huddersfield, UK

Re: SLA Pro

#2 Post by Chris_Allen » Sun Sep 03, 2017 6:48 am

Hi,

Welcome to the forum.

The FE200 is a better fit to replace the Eminence driver. Due to the 6" driver and lack of horn loading, you can cross to the piezo's at a higher frequency using alternative piezos.

If you are evaluating the 4" FE32, you are looking at building an SLA rather than an SLA pro. With a displacement of around 13cc for a single driver, 4x 4FE32's displace less air than one FE200.

They aren't suitable for pro application but would probably work very well for your home cinema.

What is your intended application for the SLA Pro?
Built:
6xDR200, 2xT39, 2xT48, 2xJack110, 1xOmni10.5, 1xAutotuba, 1xT18, 1xSLA Pro, 1xW8, 1xW10

guyfeld
Posts: 4
Joined: Thu Sep 24, 2015 2:20 am

Re: SLA Pro

#3 Post by guyfeld » Mon Sep 18, 2017 1:41 pm

Chris_Allen wrote:Hi,

Welcome to the forum.

The FE200 is a better fit to replace the Eminence driver. Due to the 6" driver and lack of horn loading, you can cross to the piezo's at a higher frequency using alternative piezos.

If you are evaluating the 4" FE32, you are looking at building an SLA rather than an SLA pro. With a displacement of around 13cc for a single driver, 4x 4FE32's displace less air than one FE200.

They aren't suitable for pro application but would probably work very well for your home cinema.

What is your intended application for the SLA Pro?
I'm a live solo musician - vocals, guitar, keyboards backtrax. My current setup is a single DB technologies Sub 15d(800wrms,133db, 40-120hz) and 4x wharfedale titan 12 passives powered by a Synq 1k0(500wrmsx2) with active xover. I have another 2x 1K0's as well.
I often play easy-listening venues outdoors where I'd like the sound to carry better without blasting people who are close by..hence my interest in the SLA Pro(I just got the plans).I've used the Bose L1m2 and although it was great for low volume, if a party started it was useless.I'd love to have a Bose-type array with 180 degree dispersion but at least 10db louder! Doesn't seem like it's possible though.
I'd also like to replace my DB Technologies sub15d bandpass sub with 4x compact (2x10's) or (1x12's) that I could use under the SLA pro's for spread or clustered together for increased spl's when needed. I can't seem to find a compact 50-75L BFM sub design though...I'd like to be able to carry a sub in one hand..(less than 25kg and dimensions like 35x30x60 cm similiar to the Celestion 50L compact designs)
Btw, I'm trying to confirm whether doubling power gives 3db and doubling drivers also gives 3db each time you do it.(Clustered subs or stacked sla Pro's) I've read conflicting stories and statements. ie. Will i be able to replace my 15" 127/133db spl 40hz sub by combining 4x 1x12 sub's (250w rms, 92db ea) if I can find 12's that will go low enough and have enough sensitivity?
Thnx

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Bill Fitzmaurice
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Re: SLA Pro

#4 Post by Bill Fitzmaurice » Mon Sep 18, 2017 2:59 pm

Doubling power gives 3dB, doubling drivers gives 6dB. As for a pro-sound sub, T24 is as small as you can go. See: Hoffman's Iron Law.

guyfeld
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Joined: Thu Sep 24, 2015 2:20 am

Re: SLA Pro

#5 Post by guyfeld » Tue Sep 19, 2017 9:41 am

Bill Fitzmaurice wrote:Doubling power gives 3dB, doubling drivers gives 6dB. As for a pro-sound sub, T24 is as small as you can go. See: Hoffman's Iron Law.
Thanks for that

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DJPhatman
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Re: SLA Pro

#6 Post by DJPhatman » Wed Sep 27, 2017 6:16 pm

And, for outdoors, you need a LOT more sub than you do tops, for an "even" sound. It take a lot more energy to reach 100dB@50Hz than to reach 100dB@500Hz. It is typically recommended to have twice as many subs as mains, for a 2:1 ratio.
I know money often seals the deal, but seriously, quality is an investment, not an expense... Grant Bunter
Accept the fact that airtight and well-braced are more important than pretty on the inside. Bill Fitzmaurice

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