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Processing Question

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Loren Jones:
All right,

I was for the first time looking at the actual settings in our DBX 481 system processors at church.  Speakers are KF650z and SB600/625.  My question is this.

Is it standard to apply the manufacturer recommended parametric EQ settings on the post crossover parametric EQ's available in the driverack and then use the pre-crossover EQ (graphic or parametric) for tuning the system to the room?  I was curious because our system has some cuts and boosts on the pre-crossover graphic EQ and then has multiple parametric filters on each bandpass post crossover, but none of the applied parametric filters are the EAW recommended filters for the KF650z.

Just curious what is the usual method when using a procesor like the driverack 481 with a speaker that has manufacturer provided EQ settings recommended.  I would have thought that you would use the post-crossover EQ to apply the manufacturer's recommended filters then use the pre-crossover EQ to make whatever changes you desire to mate the system to the room as well as possible.  What is the usual method?

Thanks,
Loren Jones

Rob Spence:
Well, there are certainly differing opinions on this but mine is that the DSP is part of the speaker subsystem and is used first to make the speakers work right.
In an install, I would expect it would also be used to make corrections for the room including timing and tone. For portable use, my use of the DSP is to align the speaker system and make corrections to make the speakers have as flat and uniform response as I can. It is installed in the amp rack and I don't make changes at a show.
I then use the graphic to make "artistic" adjustments for the show.

Keith Broughton:

--- Quote ---apply the manufacturer recommended parametric EQ settings on the post crossover parametric EQ's available in the driverack and then use the pre-crossover EQ (graphic or parametric) for tuning the system to the room?
--- End quote ---

I think this is a good way to do this. You can then lock the system parameters and have a "user" or "house" graphic EQ available for the mix person.

Loren Jones:
I was just surprised to see that the EAW recommended parametrics hadn't been applied.  I guess in the end though that the guys who installed/tuned the system placed the filters they needed to get the best response they could in our room.  Thanks for the responses.  I am just wondering out loud how much room for improvement there is in the EQ processing applied to our system.

Mac Kerr:

--- Quote from: Loren Jones on January 19, 2011, 11:16:32 pm ---I was just surprised to see that the EAW recommended parametrics hadn't been applied.  I guess in the end though that the guys who installed/tuned the system placed the filters they needed to get the best response they could in our room.  Thanks for the responses.  I am just wondering out loud how much room for improvement there is in the EQ processing applied to our system.

--- End quote ---

With systems where the manufacturer has developed presets with the precision that EAW has you should absolutely start with those filters applied as specified. The speaker cabinet and the processing are developed as a system, to be used together.

After the manufacturer's preset is applied further eq should be one either with an external eq, or with the input eq of the processor. Individual passband eq should be left alone, as should passband delay.

Mac

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