Relax on the balanced output guys!

Posted by erik olson [IP: 206.86.9.245] on February 10, 1999 at 17:03:03
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In Reply to: Relax on the balanced output guys! posted by Noah Katz on February 08, 1999 at 15:31:13:

Hey Noah, I remember you, how goes the bass list?

: You've got a pair of Rane PE-17's for your subs, right? Now I do, too.

I use one PE-17 for my subs and the other for my tactile array. Why do you have two PE-17's? Stereo subs? I'm not sure thats a good idea, EQ'ing I mean, I'll have to think about that one for a while?

: How did you adjust them? I suppose an RTA at minimum; what I wonder is, are the usual fixed 1/3-octave bands
: sufficient? It seems that ideally you'd want sweepable frequencies to really pinpoint the center frequency of
: the modes.

You are right, 1/3 octave analysis bands are not sufficient. If thats all that you use then you really aren't "that much" better off with a graphic EQ over a parametric.

I used a 1/3 octave RTA for starters/checking and then I used some 1 Hz resolution plots I made using a digital function generator and a Radio Shack SPL meter (I corrected the plot for C weighting). I also used the sine wave source as a way of pinpointing my desired center frequency. This wasn't the best way of doing it but it worked. An FFT based analyzer with a calibrated mic would be the best tool.

Some basic EQ rules:

First rule of advice is always treat the room first. Equalizing fixes frequency domain problems with the side effect of causing time domain problems. This goes for crossover adjusting too, its the same problem since you are modifying the frequency response, many people don't realize this. Also an equalizer is useless without the proper tools to set it up.

erik

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