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SECTION 3
PM1800 Specifications
3.1 GENERAL SPECIFICATIONS
Total Harmonic Distortion
Less than 0.1%, 20 Hz - 20 kHz, at + 14 dBm output
into 600 ohms.
Frequency Response
+1, —3 dB, 20 Hz - 20 kHz, at +4 dBm output тю
600 ohms.
Hum & Noise
(20 Hz - 20 kHz, "Аз = 150 ohms, Input Pad @0 dB, Input
Sensitivity @-60 dB, except as noted)
— 128 dBm equivalent input noise
— 93 dBu residual output noise (balanced outputs)
—74 dBu at GROUP OUT with Master fader at nominal
level and all channel assign switches off
— 64 dBu (68 dB S/N) at GROUP OUT with Master
fader and one channel fader at nominal level, and
channel assigned to the group bus
— 82 dBu at STEREO OUT with Stereo Master fader
at nominal level and all channel assign switches off
— 74 dBu (78 dB S/N) at STEREO OUT with Stereo
Master fader and Group Master fader at nominal
level, and one GROUP-TO-STEREO switch on
— 84 dBu at MATRIX OUT with MATRIX MASTER at
nominal level and all matrix mix controls at maximum
level, all GROUP-TO-MATRIX switches off
— 70 dBu (74 dB S/N) at MATRIX OUT with MATRIX
MASTER at nominal level, one Matrix Mix control at
maximum level, one channel fader at nominal level,
and the corresponding assigned group fader at no-
minal level and GROUP-TO-MATRIX switch on
— 65 dBu at AUX OUT with Aux Master level control
at nominal, all channel AUX mix controls at minimum
level (Pre/Off/Post switches Off)
— 63 dBu (67 dB S/N) at AUX OUT with Aux Master
level and one channel AUX mix control at nominal
level (PRE/OFF/POST switch in PRE position)
Maximum Voltage Gain
84 dB CH IN to GROUP OUT
94 dB CH IN to STEREO OUT
94 dB CH IN to MATRIX OUT
94 dB CH IN to AUX OUT
74 dB CH IN to CUE OUT
20 dB AUX RTN to GROUP OUT
10 dB SUB IN to GROUP OUT
10 dB SUB IN to AUX OUT
Input Channel Gain Control
34 dB variation in gain stop-to-stop.
Input Channel Pad Switch
0, 20, 40 dB of attenuation.
Input Channel Equalization
15 dB maximum boost or cut in the each of four bands
HIGH:
1.6 kHz ~ 16 kHz (shelving)
HI-MID:
— 800 Hz ~ 8 kHz (peaking)
LO-MID:
160 Hz ~ 1.6 kHz (peaking)
LOW:
40 Hz ~ 400 Hz (shelving)
Input Channel High Pass Filter
12 dB/octave roll off below 20 Hz ~ 400 Hz (adjustable
—3 dB point)
Crosstalk
— 60 dB at 1 kHz
Oscillator/Noise Generator
Switchable sine wave at 100 Hz, 1 kHz, or 10 kHz (less
than 1% T.H.D. at + 4 dBu output level), or pink noise.
VU Meters
STEREO L & R: 2 large, illuminated meters with Peak
LEDs. Other meters are smaller size without Peak
LEDs.
АП meters calibrated for O VU =
+4 dBu =
1.23 Vrms output; Peak LEDs turn on 10 dB before
clipping
16 channel console:
Meters 1 - 4
GROUP/MATRIX/AUX
Meter 5
GROUP 5/CUE L/AUX 5
Meter 6
GROUP 6/CUE R/AUX 6
Meter 7
GROUP 7/OSC
Meter 8
GROUP 8
Meter 9
STEREOL
Meter 10
STEREO R
24, 32 or 40 channel consoles
Meters 1 - 4
GROUP/MATRIX
Meter 5
GROUP 5/AUX 1
Meter 6
GROUP 6/AUX 2
Meter 7
GROUP 7/AUX 3
Meter 8
GROUP 8/AUX 4
Meter 9
CUE L/AUX 5
Meter 10
CUE R/AUX 6
Meter 11
OSC
Meter 12
STEREOL
Meter 13
STEREO В
Signal/Clip indicators
2 LEDs built into each input module monitor levels in
the module: CLIP (red) turns on when pre-EQ signal
is 3 dB below clipping. EQ CLIP (red) turns on when
post-EQ level is 3 dB below clipping.
Phantom Power
48 V DC is applied to electronically balanced inputs
or optional transformer-isolated inputs (via 6.8 kohm
current limiting/isolation resistors) for powering
condenser microphones. May be turned on or off via
rear-panel phantom master switch; when on, indi-
vidual channels may be turned off via +48 V switch
on each input module.
Options
171800 Input Transformers; may be installed in indi-
vidual input modules. Changes actual input impe-
dance from 3K ohms to 1K ohm.
OT1800 Set of 4 output transformers, or OT3000 Set
of 8 output transformers in rack-mountable external
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