Altec Lansing 1707C - Page 5

1783
Description
The Altec Lansing 1783 Line Output modules pro-
vides the drive capability necessary to interface
with other professional equipment. The electroni-
cally balanced output stage provides a low source
impedance to drive subsequent stages. If trans-
former isolation is necessary,the module's circuit
board accomodates the optional PC-mount 1786
Output Isolation Transformer. The continuously
variable output level control is local to the module
permitting independent adjustment of each line
output.
1783 Specifications
Output Source
Impedance: «50 Q
Nominal Output Level
[Load Impedance: +8 dBm
(Ref. 1 kHz, 0 dBm = 0.775
Vrms with 600 (2 load, output
level control at maximum, 100
mVrms input)
Maximum Output
Level: +24 dBm
Frequency Response: (Ref. 1 kHz, +8 dBm output)
+1 dB: 20 Hz- 25 kHz
Total Harmonic
Distortion (THD): (Ref. 1 kHz, +8 dBm output,
output level control at maxi-
mum, 30 kHz low pass filter)
20 Hz - 20 kHz: <0.05%
Signal to Noise Ratio: >88 dBm
(Below +8 dBm output, out-
put level control at maximum,
A-weighted)
Power Requirements: +18 VDC at 20 mA
(supplied by mainframe)
1786 Output Isolation Transformer
Impedance Ratio:
1:1 (600 0:600 N)
Frequency Response: (Ref 1 kHz, +18 dBm output)
+] dB: 20 Hz - 20 kHz
Total Harmonic
Distortion (THD): Ref 1 kHz, +18 dBm output)
20 Hz - 20 kHz: «0.596
50 Hz - 20 kHz: «0.196
Special Ordering Instructions
NOTE: The modules listed below are required
for use with the 1707C/1715C and must be
ordered separate from the mainframe.
Plug-in Input Modules:
1780A Mic/Line Input module
1780AT Mic/Line Input module with 10 kQ
bridging transformer installed
1781A Programmable Input module
1781AT Programmable Input module with
model 1785A 600 22 to 10 kQ
isolation transformer installed
1785A 600 Q to 10 kQ Input Isolation
Transformer for installation on
existing model 1781A
Plug-in Output Module:
1783 Line Output module
1786 Output Isolation Transformer
Plug-in EQ Module:
8751A Programmable 14-Band EQ module
NOTE: Each module selected requires one of
the following connectors also be ordered:
1791 1792
Female XLR Male XLR
1798 1794
Dual RCA Phono r
5-Lug Terminal