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Table Of Contents

Table of Contents

EMX660

3 7 63 1515 0

2-9 Distortion

Set each volume control of the INPUT section and MASTER section to Nominal in Tables 1. When each output

except the REC OUT level reaches +14 dBs, the distortion ratio should be less than 0.3 %.

2-10 Maximum Output Level

In the states of 2-9, the maximum output levels of MAIN OUT, MONITOR OUT and EFFECT OUT should be

+20 dBs with a distortion of less than 1%.

2-11 Equivalent Input Noise

With the level volume of the channel being measured only set to the maximum position and those of other channels

set to the minimum position and the input terminals of Lo-z and MIC shorted with 150ohms, check that the noise

level at MAIN OUT is -58dBs or less (but -56dBs or less for CH6). If the noise level exceeds the specified value,

check the converted input noise level at each channel. The acceptable level is -124dBs or less for CH1 to CH5 and

-122 dBs or less for CH6. (Use DIN AUDIO FILTER.)

2-12 Residual Noise

Set all the input level controls at minimum in the states of 2-3. When the MASTER and EFFECT OUT level

controls in the MAIN and MONITOR section are changed to maximum or minimum, the residual noise should be

as shown in the table below.

Table 5

MASTER VOLUME

Maximum

Minimum

2-13 Phantom Power

L 13942296513

Connect a load resistance of 2.7 K ohm (more than 1W) between pins 1 and 2 of both the Lo-z IN and the MIC IN

input terminals, then short between pins 2 and 3 of the Lo-z IN and the MIC IN input terminal.

When the PHANTOM switch is turned on, +10 ± 1.5 V should be obtained between both ends of the load resistance.

2-14 Digital Effect

Turn on the power while pressing VO.ECHO1 and ON switches simultaneously and check that the ON LED light

flashes. Input a -42dBs/1KHz signal to the CH6 INST, set the EFFECT level control and LEVEL control to the

maximum position, and also set MASTER and EFFECT volumes of the MONITOR to the maximum position. Then

check the signal level at the MONITOR OUT by selecting the PGM switch as described in Table 6 below.

Table 6

PGM Switch

VO. ECHO1

Set LEVEL control to min. position.

VO. ECHO2

VO.REV.1

VO.REV.2

HALL1

HALL2

ROOM

PLATE

Check that the LED light lights up when each PGM switch is selected.

Also, check that the EFFECT is applied when the music source (vocal, etc.) is input.

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2-15 Stability

When a capacitor of 10 µF to 0.1 uF is connected in parallel to the loading resistor at each SPEAKER OUT

terminal, or when all VR and EQ control volumes are set to MAX , there should be no abnormality; for example,

there should be no oscillation. Especially, check that no oscillation occurs even if the EQ HIGH is at maximum.