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Live sound system tuning!
PostPosted: Sat Oct 13, 2007 9:07 pm Reply with quote
Maheux
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Joined: 13 Oct 2007
Posts: 2




Hello, I would like to know what is the best method to tune a complete sound system DELAY TOP SUB with easera.

Thanks for your councils.

Sorry for my english!! Rolling Eyes
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PostPosted: Thu Nov 01, 2007 5:55 pm Reply with quote
Jim Mobley
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Joined: 27 Jul 2005
Posts: 134
Location: Foothill Ranch, California, USA




Hi Maheux,

Well, books can be written on setting up sound systems--and have been--but the best way is the one you are comfortable with and are experienced in doing. The procedure is also very dependant on what other hardware you have for signal processing. Assuming you have a complete multi-channel DSP and are using it for your system control, here's an overview of how I'd do it.

1) Measure each loudspeaker individually using a ground plane measurement. You want to see that all of your loudspeakers match reasonably well and you want to establish a baseline for what one loudspeaker looks like by itself.
2) If you don't have the manufacturer's recommended settings for the crossover topology and frequency, the ground plane measurement is the place to establish that. Be sure to measure both the on and off axis response when optimizing the crossover. (If you have settings from the loudspeaker manufacturer it's best to use them, as they have the facility to measure full polar response and optimize their crossovers for the best response in three dimensions.)
3) Still working with a single loudspeaker, establish a "normal" EQ for that loudspeaker.
4) Now assemble your loudspeakers into the normal array configuration. Measure the array (just one array at at time) on axis and at several points off axis. Use equalization, frequency shading and delay as necessary to optimize the performance of the array over it's intended area of coverage. If you have loudspeakers that array well, you should be able to maintain a frequency response of + or - 3 dB from the desired response over the intended coverage of the array.
5) Still working with just one array, add your subwoofers and adjust EQ, high-pass and low-pass and delay for best summation. You can "align" the subs using several techniques; I typically look at the impulse response and the summation in the magnitude display but others look at phase and group delay.

Everything up to now should be done at your shop, or even better out in the parking lot. After having done this, you now have a starting point for setting the system up in a room. When you get the system setup in the venue, here's how I proceed:

1) Start with just one array and measure it on and off axis. Using a separate processing block from the EQ you did before--you don't want to change your basic EQ and array settings for each room, just some EQ ahead of them--apply EQ to make the system work with the room. At this point you will generally be working with rather broad EQ filters for overall response shaping and checking multiple measurement locations and also do a lot of listening. Your ears MUST be the final decider on what sounds good.
2) When you have one array sounding good, switch it off and go to another. If the left and right are the same, you can generally just use the same settings for both. But if the arrays are different, you'll want to measure and EQ each one.
3) You can use the impulse response to see the arrival time of the main loudspeakers at the delay loudspeakers in order to set the delay.
4) During the gig, you can use the live module to keep an eye on the overall response and the levels.

Having said all of that, if live system tuning is your main focus, you should definitely download the demo version of EASERA Sys-Tune:

www.easerasystune.com

EASERA Sys-Tune has been specifically designed from the ground up for system tuning and has an interface and feature set optimized for that useage.

_________________
Best regards,

Jim Mobley
Sr. Application Engineer
Renkus-Heinz, Inc.
19201 Cook St.
Foothill Ranch, CA 92610 USA
TEL: +1-949-588-9997
FAX: +1-949-588-9514
www.renkus-heinz.com
mailto:jim@renkus-heinz.com
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