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In Reply to: RE: Division of labor in PA system-More posted by Duke on February 07, 2011 at 14:09:59
What makes a system "balanced" is not always the way people actually run it.
Yes you will get all kinds of different RTA readings around the room.
Of course an RTA is the wrong tool to actually be using, I only suggested it because it is easy to get ahold of and for most people to seem to understand/
Go ahead and walk up close to a loudspdeaker system and move the mic above your head and down at your knees and you will get very different readings-in relation of low to mids.
I am going on my experience in doing thousands and thousands of live shows. Maybe those are not typical, but do cross all kinds of genre from rock-country-jazz-rap-punk-ethnic-and much more.
Follow Ups:
Thanks for your input, and I was not aware of the depth of your experience. I appreciate your taking the time to respond to me here.
What I'm trying to do is take your observation that the bass may be 10 dB louder than the rest of the spectrum when you RTA it out in the farfield (indoors of course), and work backwards from that to figure out what the relative target 1-meter on axis maximum SPL would be from the mains & from the clustered subs in order to end up with a balanced system. I'm not sure it's a straightforward 1:1 correspondence because of the difference in radiation patterns and the different absorption coefficients that different wavelengths encounter in-room.
Duke
Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.
I owned my own PA&Lighting rental company for 25yrs doing everything from clubs to festivals to concerts to churches to fairs and so forth.
For the last 12+yrs I have been in the install side of the industry designing sound systems.
In a typical install the SPL across the freq band will be the same at the rear seats as it is at the front seats.
So you figure out how loud it needs to be at the rear seats and the distance involved and go from there.
Indoors you will need less bass cabinets to match the tops than outdoors.
This is because the bass reflections off of the walls will help to reinforce itself. Think of it being "contained" in the building instead of constantly expanding outside.
Outside you generally need at least twice (if not more) bass to match the tops for the same sound "experience".
A lot of this is very scientific and a lot of it is "seat of the pants"/experience type of thing.
Yes and that is why the best sub bass inside I have heard is in concrete and brick buildings
:)
I think the bass coupling to the room/building might be the right word inside verses no coupling effect outside?
"Indoors you will need less bass cabinets to match the tops than outdoors.
"This is because the bass reflections off of the walls will help to reinforce itself. Think of it being "contained" in the building instead of constantly expanding outside.
"Outside you generally need at least twice (if not more) bass to match the tops for the same sound "experience"."
This all totally makes sense to me; producing loud low bass for the back row outdoors has got to be very demanding.
Duke
Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.
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