CENTER / SURROUND ch
+20dB
+10dB
0dB
-20dB
-30dB
-40dB
-10dB
+20dB
+10dB
-20dB
-30dB
-40dB
-10dB
LINE IN/EXT IN
DAC:AK4490
LEVEL DIAGRAM
CENTER/SURROUND ch
1.98Vrms=0dBFS
-10dBFS
200mV
+30dB
SPK OUT
+29dB
FULL SCALE LEVEL = 2.0Vrms
DOLBY LIMIT LEVEL = 1.41Vrms (ALL ch -3dBFS)
GAIN Setting of MASTER VOL 00dB
･SW:YE
S
(DIGITAL)
-2.0dB -0.5dB
= -2.5dB
･SW:YE
S
(DIGITAL)
-2.0dB -0.5dB
+3.0dB = +0.5dB
①
②
③
④
①:Basic OFFSET
of VOL=0dB (i
ndication va
lude)
②:Fine-tuning b
y
software D
i
gital input
③:OFFSET of SW
NONE
④:OFFSET of A/D
input
-20dBFS(DIG.IN)
＋
＋
SPEAKER
OUT
DSP
x2
p
cs
NJU72343
GAIN
ADJ.
PRE OUT
MUTE
AK4490
D/A
－
－
＋
PLD
PRE OUT
4.24Vrms/8
Ω
-2.5dB
L.P.F GAIN = +0.4dB
200mVrms
Headroom:3dB
-23dBFS(A/D IN)
Volume IC: NJU72343 NON CLIP MAX SIGNAL LEVEL 4.2Vrms
+0.5dB
150mVrms
-2.5dB
LINE IN/EXT IN
S
W
:YES
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
50
