Samson D-150 Owner's Manual page 24

Using the D1500 to Tune an Electronic Crossover
Setting the Crossover Level Controls Using the D1500
It is critical to set the GAIN output controls so that
all the frequency bands combine to create an over-
all flat system response. Using the D1500 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 the D1500 RTA.
Note: The following example is for a two-way loud-
speaker system in a small to medium size room.
• With the crossover set to the desired frequencies,
press all the Mute switches to the ON position, turn-
ing all of the crossover's outputs 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 con-
trols to the fully counter clockwise position.
• Use the D1500's Signal Generator to produce a
frequency tone tuned to the crossover frequency, or
use the Pink Noise generator and connect the test
tone to your loudspeaker system, either from your
mixer or directly in the crossover's input. Now turn
off the Low Frequency Mute switch and adjust the
crossover's INPUT GAIN to "0' .
• Adjust the LOW GAIN control until the RTA has an
average reading of 0dB at and below the frequency
of the LOW crossover point.
• Turn off the Mid Frequency Mute switch and turn
up the MID Frequency GAIN control until the RTA
reads the same average level in the MID band.
• Adjust the HIGH GAIN control until the RTA has an
average reading of 0dB at and above the frequency
of the HIGH crossover point.
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 equal-
izer, like the Samson D2500, if you want set a particu-
lar response curve to tune the speaker system for a
specific sound.
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