Reference
30 EMX5016CF Owner’s Manual
Setting the GEQ with the FRC function
FRC (Frequency Response Correction System) can measure the frequency characteristics of the sound field, and apply the
correction curve to the GEQ according to the measurement result. There are two measurement methods available: pink
noise measurement or music playback measurement.
Setting up the GEQ by Pink Noise Measurement
This explains how to output pink noise (a kind of measurement
noise) from the speakers, pick up that noise from a microphone
plugged into channel 1, and measure the frequency characteristics
of the room.
1Connect the EMX to a set of speakers. Connect a
microphone to channel 1 INPUT A or INPUT B, and
place the microphone at the point to be measured.
2Set up channel 1 as follows, and lower the ST Master
fader all the way down.
* Adjust these settings in step 4.
• Make sure that all faders other than channel 1 are
set to their minimum and that no other signals are
input.
• Set the POWER AMP switch to L/R.
3Press and hold the MEASURE/CORRECT switch
for two to three seconds. The indicator begins flash-
ing quickly, and measurement of the frequency char-
acteristics starts.
4Adjust the ST Master fader to adjust the pink noise
output level.
To adjust the channel 1 input level, turn on the PFL
switch, and adjust the [26dB] switch and GAIN con-
trol so that the LEVEL meter 0 flashes occasionally.
Finally set the channel fader to the 0dB position.
5The measurement result is updated on the GEQ dis-
play every five seconds after measurement starts.
6Confirm that the measurement result is consistent,
and then press the MEASURE/CORRECT switch to
suspend the measurement.
The result is retained even after suspension. At this
time, the GEQ display indications flash.
This step is also handy for altering the location of the
speakers and microphone, since the noise output is
muted during the suspension. To resume the measure-
ment, press the MEASURE/CORRECT switch again.
7Turn off the channel 1 ON switch and lower the
channel fader all the way down. Leaving the fader up
and stopping the measurement in the step below can
result in howling.
8Press the MEASURE/CORRECT switch for two
seconds or longer to apply the correction curve to the
GEQ according to the frequency characteristics of
the measurement result.
The MEASURE/CORRECT switch indicator
flashes. Also, the GEQ ON switch lights up so that
the GEQ is enabled.
To prevent clipping at the power amp stage by exces-
sive equalization, the correction curve is never set
over ±6dB.
9If necessary, adjust the GEQ settings using the GEQ
+/– switches.
If you adjust the GEQ settings, the FRC indicator
turns off. To restore the correction curve immedi-
ately after measurement, press the FRC MEA-
SURE/CORRECT switch again. The indicator lights
up.
10 If necessary, store the GEQ settings to a USER
switch.
[Block Diagram of Noise Measurement]
STEREO L
R
ST OUT L
R
FRC Noise
Measurement
Noise Generator
Controls Settings
[26dB] switch Proper level*
GAIN control Proper level*
switch Off
COMP knob 0
HIGH 0dB
MID F —
MID 0dB
LOW 0dB
AUX1 knob —
AUX2 knob —
EFF1 knob —
EFF2 knob —
PAN control Center
ON switch On
Channel fader –∞ (→ 0dB)*
NOTE
NOTE
NOTE