586
FRONT PANEL
INSERT switch
This switch enables the rear-panel insert loop by inserting any device connected to the Send and Return
jacks into the signal path. The insertion point is post-tube, pre-EQ.
LOW control
This control varies the gain of the low frequency equalization; the gain range is -15 to +15 dB. The low
frequency filter is a shelving lowpass configuration with a knee frequency of 80 Hz.
MID control
This control varies the gain of the mid frequency equalization; the gain range is -15 to + 15 dB. The mid
frequency filter is a bandpass configuration with variable frequency and switchable bandwidth.
NARROW switch
This switch selects the bandwidth for the mid frequency filter. The default bandwidth is 1.5 octaves; with
the NARROW switch depressed, the bandwidth is 0.5 octaves.
Op
pera
atting Co
onttro
ols
s
7
IN
OUT
Channel 1
MANUFACTURED UNDER THE FOLLOWING U.S. PATENTS:
4,368,425 5,282,252. OTHER PATENTS PENDING.
Power Supply, if required
Figure 2: Connecting the 586 to a recorder
SHAPE
DITHER
586
Dual Vacuum
Tube Preamp
INSERT
LEVEL
METER SOURCE
DRIVE
dB
-10
+15
+25
(LINE 0dB)
+60
+30
LOW
dB
-15
0
+15
INVERT
LOW CUT
+48V
MID
dB
-15
0
+15
FREQUENCY
Hz
100
200
1k
8k
4k
NARROW
HIGH
dB
-15
0
+15
LINE
INSERT
EQ
LEVEL
dB
-15
0
+15
PeakPlus
THRESHOLD
dBu
0
+5
+10
Off
+20
+15
20 dB PAD
Off: None
Off: None
Green: TPDF Green: Shape 1
Red: SNR
2
Red: Shape 2
TYPE IV
CONVERSION SYSTEM
DRIVE
LEVEL
OUTPUT
LEVEL
LIMIT
PEAK
CHANNEL ONE
20
10 7 5 3
0
3
+
-
¨
DECIBELS
-15
-20
-10
-25
-5
-30
0
INSERT
LEVEL
METER SOURCE
DRIVE
dB
-10
+15
+25
(LINE 0dB)
+60
+30
LOW
dB
-15
0
+15
INVERT
LOW CUT
+48V
MID
dB
-15
0
+15
FREQUENCY
Hz
100
200
1k
8k
4k
NARROW
HIGH
dB
-15
0
+15
LINE
INSERT
EQ
LEVEL
dB
-15
0
+15
PeakPlus
THRESHOLD
dBu
0
+5
+10
Off
+20
+15
20 dB PAD
DRIVE
LEVEL
OUTPUT
LEVEL
LIMIT
PEAK
CHANNEL TWO
20
10 7 5 3
0
3
+
-
¨
DECIBELS
-15
-20
-10
-25
-5
-30
0
