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[Marsellus Fariss]

I started a post several weeks ago about this in the old forums and now we're getting down to a final choice and it's very important decision. It looks like the old forums aren't very active anymore so I hope it's ok that I post once more about it in the "new digs" Cause we really need to get it right. We won't get the chance to do it again for years and years. Sorry if it's not alright.

Requirements:

Room is about 50'x60' w/ low ceilings. There's pics in the old thread if you follow the link. Capacity is 500.

Genre's are everything from songwriters and bluegrass, indie rock and commercial kinda rock. No metal, DJ's or HipHop. Acts range from local to C nationals. About half of the acts bring a BE.

SPL needs to be capable of 105dbA 30' back at FOH or 115dbA(ish) at 1 meter without toasting drivers. This only happens when BE's step on the gas and it's maybe one or two shows a month but it needs to be safe.

Coverage  should be 90 or less a side using two boxes to avoid shooting into walls too much.

Budget is 2kish a box.

Current power is 6 Crown K2's and processing is an XTA 2x4, an analogue Ashly Xover if needed and DN360 at FOH. We're keeping the current 2X15" subs for the moment.


Candidates: (two a side)

EV Qrx 153/75
EV Qrx 212/75 
EAW LA460
JBL  SRX 725
JBL SRX 738

Other then that I'm keeping my eyes out for some used X-array, or KF650's but none are available at the moment.


Am I on the right track?


Link to old thread: http://http://srforums.prosoundweb.com/index.php/t/63946/0/

[Duncan McLennan]

I think waiting for a used pair of 650s is by far the best option, and worth the wait.

If that's not an option, I'd take the QRX 212.

[Marsellus Fariss]

It's looking like it's gonna be LA460's Two per side. I think we'll be happy with them. Long term SPL is 130db @ 1 meter and that should give us the 105dbA 30' back for the occasional BE who "needs" it.  I tried hard to find some 650's but none could be found used.  Also the 460's are cheaper used then the Qrx and have a little bit more friendly name for riders. Not that I've heard of many complaints about EV. At least not form people who knew 1/2 of what they where talking about. Also, we couldn't find any Qrx around to listen to but we're very familiar with 460's.

Can anybody offer me advice on powering and tuning these guys?  They'll probably be run full range for a little while to save time but bi-amping is gonna happen.

Power is 4x Crown K2's. Processing is XTA.


 



 

[DBA]

Full Range:
I would try to power them at 8 ohms stereo with your K2's.     This would give you 500w per box which should be more than enough for your quiet shows and  not let the smoke out for the other shows (as easy) that would tend to push them.  This would leave you with 2 spare amps.  (addtional sub amps,  spares?)

Bi-Amp/High Output:
Bridge the lows 2 cabinets per side on one amp per side (4 ohm bridge for the amp).  This would yeild 1250 watts per box on the lows.   Use One amp to drive all of the high end 2 boxes per side.   This would yeild 400watts per box on the highs (on paper) which is more than 2x the rated power for the drivers. 

This option would leave you with one spare amp,  a MUCH higher chance of destroying the speakers, a chance of overheating the amps (since they are passively cooled (otherwise a great amp)) .   I would not go this route unless solution A was not "enough".

Bi-Amp/Lower Power:
Run the same thing as scenario A on the low end and Scenario B on the high end.   Make sure the amps never, ever, ever hit anything close to peak on the high end.   Limit and keep the gain on the amp panel at a "bulletproof" setting.  I know this is not a "real answer" but you can set the gain structure so that it's virtually impossible to cook the drivers with the input attenuators on the amp.  Given the gain structure is correct up the chain. 

[Tim Talbot]

I would recommend the JBL SRX725 everyday.... truly stunning 

[Marsellus Fariss]

Should I apply the PEQ tunings that EAW has for bi-amping if I'm running passive?

[Tim Talbot]

Should I apply the PEQ tunings that EAW has for bi-amping if I'm running passive?

I take it you mean JBL and not EAW ... ?

If so have a look on there site and your find the PEQ settings, one for bi-amp and one for running them passive.

[Marsellus Fariss]

No the EAW. They don't only offer tunings for bi-amping the 460. Though I assume I should start with the same PEQ tunings as the crossover shouldn't change things THAT much.

[Tim Talbot]

You might be shocked just have much a different crossover(s) effect / change the sound

[David Morison]

Coverage  should be 90 or less a side using two boxes to avoid shooting into walls too much.
<snip>
Candidates: (two a side)

EV Qrx 153/75
EV Qrx 212/75 
EAW LA460
JBL  SRX 725
JBL SRX 738

None of those will do 90 degrees coverage per side using 2 boxes without quite a bit of overlap - most of them are 75deg horizontal per side. Maybe look for 2nd hand EV Phoenix (45 deg per box IIRC)?
Just a thought,
David.

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