29
SPX2000
■
INSPECTIONS
1.
Preparations
1-1. Conditions
Use following conditions unless otherwise specified.
• INPUT VOLUME: MAX
• Level select switch: +4dBu side (both input and output)
• Analog output load: 600
Ω
• Word clock (FS): 96kHz
To select the word clock, press the UTILITY key several
times and when "CLOCK SOURCE" appears on the
LCD, press the INC/DEC key.
• 0dBu = 0.775Vrms
• 0dBFS = 0dB, full scale
• Oscillator output impedance: 150
Ω
.
A sine wave is output.
• Input impedance of oscilloscope, level meter, etc.: 100
k
Ω
or more
• Noise measurement is corrected with 12.7kHz, -6dB/
octave low pass filter. (Use average values instead of
effective values for measurement.)
• Cross talk and distortion ratio measurement is corrected
with 80kHz, -18dB/octave low pass filter.
• For check items other than “2-7”, turn on the BYPASS
key and keep the BYPASS LED lit while checking.
1-2. Measuring Instruments
• Use System Two CASCADE Control Software APWIN
Version 2.22 of Audio Precision Co. or its equivalent.
• Noise meter (Use LMV-1817 of READER Corp. or
the equivalent when measuring the noise.)
1-3. Writing Programs
If the main program is not the latest version, it must be
upgraded to the latest program. For the details, refer to
"Method for Writing the Program" on page 49.
[2] Frequency response (both L and R)
Condition:
1kHz is used as reference of the permissible range.
[3] Level difference between left and right
The range of difference in the gain measured in [1] above
is specified as follows.
[4] Residual noise (both L and R)
Condition: The input function should be turned off.
Permissible range
Within 1dB
Input frequency
Input level
Permissible range
20 Hz
+4 dBu
-1．5〜+0．5 dB
40 kHz
+4 dBu
-1．5〜+0．5 dB
Input frequency
Input level Specified output level Permissible range
1 kHz
+4 dBu
+14 dBu
+14±2 dBu
[5] Crosstalk between left and right
Condition:
The R channel input function should be turned off when
signals are inputted to the L channel.
The L channel input function should be turned off when
signals are inputted to the R channel.
Permissible range
-80 dBu or below
Input frequency Output level L(R) Permissible range R (L)
1 kHz
+22 dBu
-58 dBu or below
2-2. When ANALOG INPUT/OUTPUT WORD
CLOCK is INT 48kHz
Condition:
Signals are inputted through ANALOG INPUT L, R
(PHONE) and output from ANALOG OUTPUT L, R
(PHONE).
2.
Check Items
2-1. When ANALOG INPUT/OUTPUT WORD
CLOCK is INT 96kHz
Condition:
Signals are inputted through ANALOG INPUT L, R
(XLR) and output from ANALOG OUTPUT L, R
(XLR).
[1] Gain (both L and R)
Connecting hot and cold terminals of OUTPUT L, R to
GND respectively provides the same result.
MIDI IN
MIDI OUT
SYSTEM TWO
SP
SP
• Connect the powered
speaker to the ANALOG
O U T t e r m i n a l w h e n
executing Test item 2-8
Sound Check.
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