586
¨
MICROPHONE INPUTS
Connectors:
Female XLR Pin 2 hot
Type:
Electronically balanced/unbalanced
Impedance:
1.70 k
Ω
Optimum Microphone Impedance:
150 - 200
Ω
Maximum Input Level:
> +13 dBu, or +33 dBu with 20 dB pad engaged
CMRR:
> 115 dB at 60 Hz, > 110 dB at 1 kHz, > 75 dB at 10 kHz
LINE INPUTS
Connectors:
Female XLR Pin 2 hot and TRS 1/4”
Type:
Electronically balanced/unbalanced
Impedance:
>40k
Ω
balanced, >20k
Ω
unbalanced, or 470k
Ω
unbalanced with rear-panel
INST switch engaged
Maximum Input Level:
> +30 dBu, or +22 dBu with rear-panel INST switch engaged
OUTPUTS
Connectors:
Male XLR Pin 2 hot and TRS 1/4”
Type:
Servo-balanced/unbalanced, RF filtered
Impedance:
Balanced 120W, unbalanced 60
Ω
Maximum Output Level:
>+21 dBu, balanced or unbalanced
INSERT
Connectors:
TRS 1/4”
Type:
Impedance balanced/unbalanced (SEND),
Electronically balanced/unbalanced (RETURN)
Impedance:
SEND: 100
Ω
balanced/50
Ω
unbalanced
RETURN: 40k
Ω
balanced, 20k
Ω
unbalanced
Nominal Send Level:
+4 dBu
Nominal Return Level:
+4 dBu
SYSTEM PERFORMANCE
DRIVE Control Range:
+10 dB to +60 dB
LEVEL Control Range:
-15 dB to +15 dB
0.5 dB Bandwidth:
15 Hz to > 90 kHz +0/-0.5 dB
Frequency Response:
<10 Hz to >200 kHz +0/-3.0 dB
EIN:
Typically -126 dBu, 150
Ω
source impedance, unweighted, 22 kHz measure-
ment bandwidth
THD + Noise:
0.04% typical at 0 dBu out, 1kHz, 33 dB gain
(Drive control at minimum, Level control at maximum)
3.5% typical at +21 dBu out, 1kHz, 35 dB gain
(tube saturation with Drive and Level controls at 50%)
Deviation From Linear Phase:
< 20 degrees, 20 Hz to 20 kHz.
Interchannel Crosstalk:
Typically -98 dB, 20 Hz to 20 kHz.
EQUALIZER
LOW Frequency:
80 Hz, shelving filter
HIGH Frequency:
12 kHz, shelving filter
MID Frequency:
Sweepable from 100 Hz to 8 kHz, bandwidth 1.5 octaves (WIDE) or 0.5
octaves (NARROW)
Gain (all bands):
Sweepable from -15 to +15 dB.
Sp
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12
¨
