1-2
1.2
Specifications
Layout:
1U rack-mount unit incorporating a
professional surround encoder module,
interface circuitry, and power supply.
Signal Connections:
Left, Center, Right and Surround XLR inputs.
Lt (Left total) and Rt (Right total) XLR
outputs.
EPL (External Process Loop) XLR sends and
returns.
(All XLR connectors wired pin2 “hot.“ For
unbalanced operation, at the SEU4 end
connect cables exactly as for balanced circuits
and unbalance the circuit only at the remote
end.)
Front Panel Controls and Indicators:
Ten screwdriver adjustable trim controls:
Left, Center, Right, and Surround input; Lt
and Rt External Processor Loop (EPL) send;
Lt and Rt EPL return; Lt and Rtmain
outputs. Four segment LED meters for each
input L,C,R, and S; LED surround active
indicator and 2 LEDs for EPL status.
Input Circuit:
(0 dBr = 0.775V rms)
Four balanced floating transformerless
inputs. Input gain adjustment will
accommodate a range of 300mV (–8.2dBr) to
2V rms (+8.2dBr). Input impedance is
greater than 10kohms. Maximum common
mode voltage 4 V rms, 5.8 V peak.
Output Circuit:
Two balanced floating transformerless
outputs. Output gain adjustment will
accommodate a range of 250mV (–9.8dBr)
to 2.5 V (10.2dBr).
Output impedance 25ohms.
Maximum output v26dBr into
balanced 600 ohm load, less into lower
impedances. Maximum 20dBr into
unbalanced 600ohm load.
External Processor Loop:
A two-channel EPL is provided for interface
with other equipment. The loop is engaged
by an internal switch and allows external
processing to be inserted via EPL input and
output connectors.
Overall Frequency Response:
20Hz—20kHz
±
1dB (L, C, andR inputs).
100Hz—7kHz
±
3dB (surround input).
S/N Ratio: (referenced to Dolby level)
Greater than 80dB, CCIR/ARM weighted.
Distortion:
Total Harmonic Distortion (THD) at themain
balanced outputs will not exceed 0.25% into
balanced loads 600 ohms or greater at any
output level to 12.5V rms. THD at Dolby
level at 1kHz with input and output adjusted
for 4dBr, 0.1% typical.
Ambient Operating Temperature:
Up to 40 degrees C.
Construction:
Two plug in modules: one Dolby surround
encoder and one interface module.
Fiberglass printed circuit cards, gold-plated
edge connectors, solid-state devices
throughout.
Size:
1 rack unit 43mm (1.75") high, 260mm
(10.25") deep behind mounting
surface;maximum projection in front of
mounting surface 7mm (0.28").
Weight:
5 kg, (11 lb.)
Power Requirements:
The SEU4 consumes about 20 watts and is
designed for operation from a centrally
switched power source. 230 V version: 198-
264 V ac, 50/60 Hz, uses one 20 mm T250 mA
fuse. Multi-voltage version: 85-132 V ac, 50/
60 Hz, uses one 1.25" 500 mA slow-blow fuse,
or 187-264 V ac, 50/60 Hz, uses one 20mm
T250 mA fuse.
Specifications subject to change without
notice.
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