Harman dbx 504X, Manual

Page: 10 / 23

Digital Output Card
504X
504X Digital Output Card ®
10
DITHER: Selects dither type of TPDF, SNR
2
, or None. Dither is random
noise that is added to the audio signal which effectively eliminates the
harmonic distortion created by truncation. See “Truncation” graph on page
20.
SHAPE: Selects noise-shaping type of TYPE 1 or TYPE 2. Noise shaping
essentially takes the noise floor and reshapes it in a fashion such that the
ear perceives the noise floor to be quieter than it really is. See “Noise
Shaping” graph on page 20.
When the dbx 504X is used in a dbx 576 or a 1086, where channel 1 is a
microphone preamp and channel 2 is a dynamics processor, you may wish
to swap the digital output channels or send one analog channel to both
left and right digital outputs. This can be accomplished by following these
steps:
1. Press and hold both the DITHER and SHAPE button on the front panel
simultaneously for about 3 seconds until they start to flash red and
green.
2. The DITHER button is associated with the LEFT digital output while the
SHAPE button is associated with the RIGHT digital output. A button
color of GREEN is associated with channel 1 while a button color of RED
is associated with channel 2. So, if you wish to send the microphone
preamp (channel 1 of dbx 576) to both LEFT and RIGHT of the digital
output, simply press the SHAPE button (after step #1 above) so that it
and the DITHER button are both GREEN.
Digital Output Channel Swapping
SHAPE DITHER
566
Vacuum Tube
Compressor
Off: None Off: None
Green: TPDF Green: Shape 1
Red: SNR 2 Red: Shape 2
TYPE IV
CONVERSION SYSTEM
INSERT
LEVEL
METER SOURCE
DRIVE
LEVEL OUTPUT
LEVEL
20
10 7 5 3 0
3
+
-
®
DECIBELS
-15
-20 -10
-25 -5
-30 0
DRIVE
dB
-15
0
+15
THRESHOLD
dB
-40
-30
-20 0
0
-
-10
+
+10
+20
CONTOUR BYPASS SC ENABLE
RATIO
1:1
1.2:1
1.5:1
2:1
3:1
6:1
∞
:1
ATTACK
dB/mSec
3
1
.35
.04
.15
OverEasy
RELEASE
dB/Sec
250
125 12.5
50
5
UNLINK
AUTO
LEVEL
dB
-15
0
+15
PeakPlus
THRESHOLD
dB
0
+5
+10
Off
+20
+15
SC MON
LIMIT
PEAK
CHANNEL TWO
20
10 7 5 3 0
3
+
-
®
DECIBELS
-15
-20 -10
-25 -5
-30 0
GAIN
REDUCTION
METER SOURCE
DRIVE
LEVEL OUTPUT
LEVEL
INSERT
LEVEL
METER SOURCE
DRIVE
LEVEL OUTPUT
LEVEL
DRIVE
dB
-15
0
+15
THRESHOLD
dB
-40
-30
-20 0
0
-
-10
+
+10
+20
CONTOUR BYPASS SC ENABLE
RATIO
1:1
1.2:1
1.5:1
2:1
3:1
6:1
∞
:1
ATTACK
dB/mSec
3
1
.35
.04
.15
OverEasy
RELEASE
dB/Sec
250
125 12.5
50
5
UNLINK
AUTO
LEVEL
dB
-15
0
+15
PeakPlus
THRESHOLD
dB
0
+5
+10
Off
+20
+15
SC MON
LIMIT
PEAK
CHANNEL ONE
GAIN
REDUCTION
METER SOURCE
DRIVE
LEVEL OUTPUT
LEVEL
Front Panel