Yamaha EMX5016CF Owner's Manual - Page 30

Reference 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. Noise Generator STEREO L FRC Noise R Measurement ST OUT L R [Block Diagram of Noise Measurement] 1 Connect 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. 2 Set up channel 1 as follows, and lower the ST Master fader all the way down. 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 Channel fader On -∞ (→ 0dB)* * Adjust these settings in step 4. NOTE • 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. 3 Press and hold the MEASURE/CORRECT switch for two to three seconds. The indicator begins flashing quickly, and measurement of the frequency characteristics starts. 4 Adjust 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 control so that the LEVEL meter 0 flashes occasionally. Finally set the channel fader to the 0dB position. 5 The measurement result is updated on the GEQ display every five seconds after measurement starts. 6 Confirm 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. NOTE 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 measurement, press the MEASURE/CORRECT switch again. 7 Turn 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. 8 Press 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. NOTE To prevent clipping at the power amp stage by excessive equalization, the correction curve is never set over ±6dB. 9 If 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 immediately after measurement, press the FRC MEASURE/CORRECT switch again. The indicator lights up. 10 If necessary, store the GEQ settings to a USER switch. 30 EMX5016CF Owner's Manual