SETTING UP THE S 2-way USING A REAL TIME ANALYZER
12
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Turn off the High Frequency MUTE switch and turn up the High Frequency Level control until the RTA
reads 0dB at the crossover frequency.
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Now, press the LOW MUTE switch again turning on the low frequency output. Notice the reading on the
RTA at the crossover frequency. If the reading is 0dB, there is no need to adjust the delay time and you
can assume that the speakers are in phase. If the RTA reads less than +3dB you’ll need to delay the low
frequency.
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While watching the RTA display, slowly turn the DELAY control counter-clockwise until the display reads
as close to +0dB as possible.
Setting the GAIN Controls Using a RTA
It is critical to set the GAIN output controls so that all the frequency bands combine to create an over-all flat sys-
tem response. Using an RTA to set the GAIN control will make it much easier for you to accomplish a flat system
response. Follow the steps below, separately for each side of your system, to set the GAIN controls using an
RTA.
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With the crossover set to the desired frequencies, press all the Mute switches to the ON position, turning
all of the S 2-way’s outputs off. Be sure that all of the PHASE switches are out (LED’s off). Position your
measurement microphone approximately 15 feet from your loudspeaker array at a level ranging from
your chest to your ear. Now turn all the GAIN controls to the fully counter clockwise position.
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Play a sine wave tuned to the crossover frequency, or connect the signal from a pink noise generator to
your loudspeaker system, either from your mixer or directly in the S 2-way’s input. Now turn off the Low
Frequency Mute switch and adjust the S 2-way’s INPUT GAIN to "0’.
•
Adjust the LOW GAIN control until the RTA has an average reading of -3dB at and below the frequency
of the LOW crossover point.
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Engage the LOW Mute.
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Next, play a sine wave tuned to the crossover frequency, or connect the signal from a pink noise genera-
tor to your loudspeaker system, either from your mixer or directly in the S 2-way’s input. Now turn off the
HIGH Frequency Mute switch.
•
Adjust the HIGH GAIN control until the RTA has an average reading of -3dB at and above the frequency
of the HIGH crossover point.
•
Engage the HIGH mute and turn off the mute in the LOW frequency output. Check to see if the RTA is
still showing -3dB at the crossover point. Remember the High frequency output is also set for -3dB out
put, and since both the high and low frequency outputs are set to a level of -3dB at the crossover point,
the summed signal level will be 0dB.
Note: If you have trouble making the measurements as described above, be sure to check the position of
the PHASE switches, and also, check your balanced wiring for proper phase. For a detailed cable-wiring
diagram see page 13.
At this point all of the frequency bands will be at the same level and your system will have a flat response. After
setting the levels you can use a graphic equalizer, like the Samson S curve 231 or D 2500, if you want set a par-
ticular response curve to tune the speaker system for a specific sound.
