Altec Lansing 1707C MIXER AMPLIFIER User manual

LANSING:'
1707C/1715C
Six Channel Mainframe
Mixer/Power Amplifier
KEY FEATURES
* Six ports for inputs or outputs
* Offers systemwide remote muting
* Built-in compressor/limiter
KEY SYSTEM SPECIFICATIONS
(Ref. 1 kHz)
+1 dB, 20 Hz - 20 kHz
(1 watt output)
+1 dB, 20 Hz - 20 kHz
(0.775 Vrms output, 600 Q
load)
Frequency Response:
Direct Output:
Preamp Output:
Total Harmonic
Distortion (THD):
Direct Output:
(Ref 1 kHz)
<0.05%, 20 Hz - 20 kHz
(rated output power,
30 kHz low-pass filter)
<0.05%, 20 Hz - 20 kHz
(0.775 Vrms output, 600 Q
load, EQ flat, compressor/-
limiter off, 30 kHz low-pass
filter)
Preamp Output:
Signal-to-Noise Ratio:
Direct Output:
(master at maximum)
Preamp Output:
>80 dB below rated output
power, A-weighted
>75 dB below 0.775 Vrms
output, A-weighted, EQ off,
compressor/limiter off
DESCRIPTION
The Altec Lansing 1707C/1715C Mixer/Power
Amplifier is a six channel user-configurable main-
frame amplifier. By selecting from the large array of
system component options, the 1707C/1715C can
become a six-in/one-out microphone mixer/amp-
lifier or a one-in/six-out distribution preamplifier.
The basic mainframe combines a fully protect-
ed 75-watt (for the 1707C) or 150-watt (for the
1715C) power amplifier with six ports which can
be input or output. Multiple 1707C/1715C main-
frames can be linked together for situations where
more then six input/output ports are required.
Built-in features include a trap-door on the top
panel for easy access into the unit, compressor/-
limiter, low and high frequency shelving equalizers,
muting, remote volume control capability, and a
tone generator which produces four different
sounds.
Input Modules: The Altec Lansing 1780A/-
1780AT Input module and the 1781A/1781AT
Programmable Input module accept either mic or
line level signals through a wide variety of connec-
tor interfaces.
Output Modules: The Altec Lansing 1783 Line
Output module allows the user to interface with
other professional equipment.
The Altec Lansing model 1707C/1715C mix-
er/power amplifier systems respond to most design
tasks with the ease and versatility of systems
costing much more. Às a result, it is the choice for
use in professional installations requiring high
quality, flexibility in design, and low cost.

Continuous Average
Power:
1707C:
1715C:
Maximum Midband
Output Power:
1707C:
1715C:
Power Bandwidth:
Direct Output:
Intermodulatlon
Distortion:
Direct Output:
Damping Factor:
Direct Output:
Rated Output Level:
Direct Output:
1707C:
1715C:
Preamp Output:
Transformer Output:
1707C:
1715C:
Equalization:
Bass:
Treble:
Compressor/Limiter:
Threshold:
Compression Ratio:
Release Time:
Tone Generator:
Tones:
Control:
Level Adjustment:
Protection Svstem:
Amplifier:
Load:
Front Panel Controls:
input:
Compressor/Limiter:
1707C/1715C Specifications (cont'd)
75 watts
150 watts
(Ref. 1 kHz at 1% THD)
100 watts
175 watts
(Ref. 1 kHz at rated output)
>20 Hz - 20 kHz
(SMPTE 4:1)
<0.1% at rated power
>40, 20 Hz - 1 kHz
(Ref. 1 kHz)
(unbalanced)
24.5 Vrms/8 Q load
24.5 Vrms/4 Q load
(unbalanced)
0 dBm, 600 2 min. load
(balanced)
17.4 Vrms/4 Q load
25.0 Vrms/8 2 load
70.7 Vrms/66.6 Q load
25.0 Vrms/4.2 Q load
34.6 Vrms/8 2 load
70.7 Vrms/33.3 Q load
(Shelving type)
+12 dB at 100 Hz
+12 dB at 10 kHz
Feedforward Topology
-20 dB to +20 dB
Continuously variable
(Ref. 100 mVrms on Link input)
1:1 to 0:1
Continuously variable
50 msec to 5 sec.
Continuously variable
Electronically produced
Buzzer, siren, single-tone chime,
and repeating tone chime
All tones are initiated by
external switch closures
Rear panel
e Short circuit current limiting
e Over voltage limiting
e Thermal sensing
e Spurious oscillatory protection
e Low AC line sensing
e Output DC detection
e Subsonic detection
e Tum-or/off transients (=3 secs)
6 - Input Level adjust
I - Release Time adjust
1 - Threshold adjust
1 - Compression Ratio adjust
EQ Controls:
Output:
Miscellaneous:
Rear Panel Controls:
Tone Generator:
Front Panel Indicators:
Connectors:
Amplifier Input:
Link Input:
Battery:
Amplifier Output:
Preamp Output:
Link Output:
Mute and Tone Generator:
Power Requirements:
AC Mains:
Battery:
1707C:
1715C:
Power Consumptlon
and Heat Produced:
1707C:
75 watts output:
25 watts output:
1715C:
150 watts output:
50 watts output:
Operating
Temperature Range:
Dimensions:
Width:
Height:
Depth:
Net Weight:
1707C:
1715C:
Finish Color:
Accessories Included
with Malnframe:
1 - On/Off switch
I - Bass adjust
1 - Treble adjust
I - EQ In/Defeat switch
I - Master Level adjust
l - AC Power switch
] - Output Level adjust
6 - Green LED's (Nominal Input)
6 - Red LED's (Peak Input)
I - Red LED (Main Output clip)
I - AC Power ON
I - RCA phono receptacle
I - RCA phono receptacle
I - 3-terminal barrier strip
I - 7-terminal barrier strip
1 - RCA phono receptacle
I - RCA phono receptacle
7 - Screw terminals
(Ref. 1 kHz, rated output
with no modules installed)
100/120/200/220/240 VAC,
50/60 Hz.
+48 VDC bipolar
1.5 amps maximum
3.0 amps maximum
165 w consumed, 306 BTU/hour
130 w consumed, 357 BTU/hour
320 w consumed, 578 BTU/hour
230 w consumed, 612 BTU/hour
Up to 50°C (122°F)
19 inches (48.3 cm)
5% inches (13.3 cm)
13 inches (33.0 cm)
25 lbs. (11.4 kg)
32 lbs. (14.5 kg)
Black
1 - Operating/Service Instructions for Mainframe,
1780A/AT, 1781A/AT and 1783
l - Preamp Out to Amp In “U” Shorting Bar
l - Direct Output to OT in Shorting Bar
] - System Configuration Label
1 - International 220/240 VAC voltage decal
l - International Fuse decal and fuse
1 - Rack mount hardware kit
Altec Lansing continually strives to improve their products and
performance. Therefore, specifications are subject to change
without notice.

1780A/1780AT
Description
The Altec Lansing 1780A/1780AT Mic/Line Input
modules combine basic microphone preamplifi-
cation with true line level input capabilitv. The
module has a built-in resistive pad to permit levels
in excess of 0 dBu and its high input impedance
easilv allows sixteen modules to be driven from a
single low impedance source. Also, the module
offers a 300 Hz high-pass filter, phantom power
capability, L + R stereo summing, and 0 to 50 dB
of continuously variable gain. Included in the
1780AT version is a 10 kQ input bridging trans-
former for those who prefer transformer isolation.
INPUT
1780A/1780AT Specifications
Gain: 0 - 50 dB, continuously
variable
Input Sensitivity:
Without Pad: -68 dBu to -18 dBu
(.3 mVrms to 100 mVrms)
-48 dBu to +2 dBu
(3 mVrms to 1 Vrms)
With Pad:
Input Impedance:
1780A: 10 kQ
1780AT: 10 kQ
With 1793 Dual Phono: 40 kif
Frequencv Response: 50 Hz - 20 kHz, +1 dB
Total
Harmonic Distortion: (Ref. minimum gain,
90 Hz - 20 kHz measurement
bandwidth, 30 kHz low-pass
filter)
1780A: <0.01%
1780AT: <0.025%
Equivalent Input Noise: <-120 dBr
(Ref. 0 dBr = 100 mVrms out-
put, 10 kQ load, 200 © input
termination, maximum gain,
A-weighted)
High Pass Filter:
Comer Frequency:
Slope:
Controls:
Weight (Net):
17804:
Power Supply
Requirements:
Included Accessories:
* FB1 4 FB2 IN
Block Diagram of the 1780A/1780AT Input Module
300 Hz
12 dB/octave
1 - Gain, continuously
variable
2.5 oz. (70 g)
3.0 oz. (85 g)
+18 VDC at 15 ma DC
(supplied bv mainframe)
1 - 2-pin female jumper
(for phantom power)
2 - mounting screws
(for potentiometer bracket)
| - Operating Instructions

1781A/1781AT
Description
The Altec Lansing 1781A/1781AT Programmable
Input modules accepts either mic or line level
signals through a wide variety of connector inter-
faces. Standard features include an electronically
balanced input stage with adjustable gain, continu-
ously variable high and low pass filters, RFI protec-
tion, 48 volt phantom powering two levels of
muting, and remote volume control capability.
Programming with plug-in jumpers which may
select phantom power (on or off), mute priority or
slave, or remote volume control. The 1781AT
module also comes equipped with a 1785A Input
Isolation Transformer which provides an additional
10 dB of gain for improved sensitivity.
+ IN
— IN
RIGHT CH
LEFT CH
GND
Block Diagram of the 1781A/1781AT Input Module
1781A/1781AT Specifications
Gain:
1781A: 0 dB - 50 dB,
continuously variable
1781AT: 10 dB - 60 dB,
continuously variable
Input Sensitivity: (Ref. I kHz, 10 kQ load)
1781A: -68 dBu to -18 dBu
(0.3 mVrms - 100 mVrms)
1781AT: -78 dBu to -28 dBu
(0.1 mVrms - 30 mVrms)
Input Impedance: (Ref. 1 kHz)
Electronically balanced: >8 k0
Transformer balanced: 200 Q - 600 Q
With 1793 Dual Phono
Connector Installed: >39 kN
(Ref. 1 kHz, 100 mVrms
output, 10 kf) load)
Frequency Response:
17814:
X] dB (minimum gain): 20 Hz - 20 kHz
+1 dB (maximum gain): 50 Hz - 20 kHz
1781AT:
+1 dB (minimum gain): 20 Hz - 20 kHz
+1 dB (maximum gain): 90 Hz - 15 kHz
Total Harmonic
Distortion (THD):
20 Hz - 20 kHz:
Equivalent Input Noise:
High Pass Filter (Low Cut):
Comer Frequency:
Slope:
Low Pass Filter (High Cut):
Comer Frequency:
Slope:
Attenuation:
Mute:
(Ref. 1 kHz, 100 mVrms
output, minimum gain, 10 kN
load, 30 kHz low pass filter)
<0.03%
(Ref. 0 dBr = 100 mVrms
output, 10 kM load, 200 Q
input termination maximum
gain, A-weighted)
<-120 dBr
(Ref. 100 mVrms output,
minimum gain, 10 kf) load)
320 Hz
(>10 dB at 100 Hz)
6 dB/oct (20 dB/dec)
(Ref. 100 mVrms output,
minimum gain, 10 kQ load)
5 kHz
(>6 dB at 10 kHz)
6 dB/oct (20 dB/dec)
(Ref. 100 mVrms output,
minimum gain, 10 kQ load)
>60 dB
(10 k(2 remote)

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

CONFIGURING THE MAINFRAME
The Mainframe's Inner Workings
MODULE OUT "NOMINAL yoyo ‘PEAK’
100mV RM
ZIN-
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IN
Tr
1
INPUT OUTPUT MIX OUT
INPUT
with mainframe LEVEL SUM
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BUZZER P
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li
DIN
SHELVING
EQUALIZER
BASS TREBLE
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THRESHOLD COMP REL ,
RATIO TIME |
100mY RMS
Z IN - 10K
LEVEL
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LINK OUT
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0.775V AMS
AMPIN
AUX DUT MASTER
POWER
AMPLIFIER
BARRIER
TRANSFORMER STRIP
POWER ON E A
ue a VOLTAGE
POWER SAC UNE SELECTOR |
SWITCH FUSE
100/120/200/220/
240VAC 50/60HZ
JK USER INSTALLED STRAPS
+V VOLTAGE
POWER du RAILS
SUPPLY
ó 6 à i
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*48V OC INPUT
1707C/1715C System Block Diagram
ARCHITECT'S and ENGINEER'S SPECIFICATION
The mixer/power amplifier shall have six configurable
ports and be capable of operating from 100, 120, 200,
220, or 240 Vac, 50/60 Hz line, or from +48 VDC.
Each port shall be usable with a microphone or other
high level device. The mixer/power amplifier main-
frame shall include a compressor/limiter, low and
high frequency shelving equalizers, and a tone
generator capable of producing general purpose and
emergency warning signals.
The power amplifier shall meet the following perfor-
mance criteria: Power Output: 75 watts (1707C) at
less than 0.05% THD from 20 Hz to 20 kHz (8 Q direct
output), or 150 watts (1715C) at less than 0.0596 THD
from 20 Hz to 20 kHz (4 2 direct output). Frequency
Response: 20 Hz to 20 kHz, +1 dB (direct output).
Source Impedance: 150 Q to 250 Q nominal with a
microphone preamplifier, 600 Q with a bridging
transformer, 150 (2 to 600 Q with a line matching
transformer, and greater than 30 kQ with a tape
preamplifier. Equivalent Input Noise: «-120 dBr with
a low impedance microphone preamplifier. Output
Noise: «-85 dBm (with all controls off).
The mixer/power amplifier shall be rack mountable
and finished in black. The amplifier's dimensions
shall be 514" (H) x 19" (W) x 12%" (D) and its net
weight shall be 24.2 lbs. (1707C), or 30.8 lbs.
(1715C).
The plug-in accessory modules shall be the 1780A/AT
and the 1781A/AT Input modules and the 1783 Line
Output module. The accessory transformers usable
with the modules shall be the 1785A Input Isolation
transformer and the 1786 Output Isolation transform-
er. The connector subassemblies shall be the 1791
female XLR, 1792 male XLR, 1793 dual phono, and
the 1794 5-lug screw terminal connector.
The mixer/power amplifier shall be the Altec Lansing
Model 1707C/1715C.
ALTEC
LANSING
a MARK IV company
P.O. BOX 26105 e OKLAHOMA CITY, OK 73126-0105 e U.S.A. e 405/324-5311 or FAX: [phone]
© 1992 ALTEC LANSING CORPORATION
PRINTED IN U.S.A. 7/92
Revision 1
42-07-029244

ALTEC
the sound of experience
1707C & 1715C
Mixer/Power Amplifiers
Operating and Service Instructions
ALTEC LANSING CORPORATION
MA
a RK IV companv
P.O. Box 26105 e OKLAHOMA CITY, OK e 73126—0105 e 405—324—5311 or FAX 405—324—8981

Table of Contents
Section
SPECIFICATIONS
ELECTRICAL CONNECTIONS FOR THE 1707C/1715C
MIXER/POWER AMPLIFIERS
Power Connections (120 Volt, 50/60 Hz)
Power Connections (100, 200, 220, or 240 Volt; 50/60 Hz)
INSTALLING MODULES IN THE MAINFRAME
SHELF OR RACK MOUNTING THE 1707C/1715C
MIXER/POWER AMPLIFIERS
Ventilation
CONFIGURING THE MAINFRAME
The Mainframe's Inner Workings
Output Connection
Output Fuse
Mute/Tone Generator Connections
The Rear-Panel Output-Level Control
Resistance Effects of Long-Cable Runs on Mute —
and Tone-Generator Circuits
LINK IN/LINK OUT Connections
PREAMP OUT/AMP IN Connections
AUX OUT Connections
Battery Input Connections
FRONT/REAR-PANEL CONTROLS, SWITCHES, INDICATORS,
AND CONNECTORS
INITIAL SETUP AND OPERATION OF MAINFRAME WITH
MODULES INSTALLED
Initial Setup of an Input Module
Initial Setup of an Output Module
Initial Setup of the Mainframe
Operating the 1707C/1715C Mixer/Power Amplifiers
SERVICE INSTRUCTIONS
SERVICE INFORMATION
Power Amplifier Bias Adjustment
Power Amplifier DC Offset Adjustment
Parts Ordering
Factory Service
Technical Assistance
Pants List |
List of Tables and Figures
Table I. AC Line Voltage Selection and Strapping Chart
Table Il. AC Fuse Selection Chart
Table lil. Maximum Allowable Cable Resistances
Figure 1. Top-Cover Removal
Figure 2. Location of Voltage Selection Terminal Block
Figure 3. Application of International Stickers
Figure 4. Module Installation
Figure 5. Removal of Blank Cover Panel
Figure 6. System Configuation Label
Figure 7. Block Diagram of 1707C/1715C Mixer/Power Amplifiers
Figure 8. Direct Output Connections
Figure 9. Transformer Output Connections
Figure 10. Mute/Tone Generator Switch Connections
Figure 11. Typical Linking Connections
Figure 12. Patching an External Equalizer or Other Signal Processing
Devices
Figure 13. Battery Input Connections
Figure 14. Front-Panel Controls, Switches, and Indicators for the
1707C/1715C
Figure 15. Rear-Panel Control and Connectors for the 1707C/1715C
Figure 16. Schematic of the 1707C/1715C Mainframe
Page
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Description
The 1707C and 1715C Mixer/Power Amplifiers offer a
highly flexible integration of a user configurable six input
mixer with a fully protected power amplifier in one con-
venient cost effective package.
The six input ports accept any of the several input
modules or output module. The programmable input
modules may have their muting circuitry configured in
either "priority", "slave" mode, or may be set to ignore
muting commands. When a module configured in the
"Priority" mode is activated, modules in the "slave" mode
will be muted.
Circuitry is also provided to allow remote volume
control of individual inputs.
Multiple mainframes may be dynamically linked
together. Separate preamp-out and amplifier-in jacks allow
the insertion of equalizers or other signal processing
between the mixer and the power amplifier.
A multi-tone generator and a compressor/limiter are
also provided.
Continuous
Average Power:
1707C:
1715C:
Maximum Midband
Output Power:
1707C:
1715C:
Power Bandwidth:
Direct Output:
Transformer Output:
Frequency Response:
Direct Output:
Transformer Output:
Link Output:
Preamp Output:
Specifications
Input Sensitivity / Input Impedance:
75 watts
150 watts
(Reference 1 kHz at 196 THD)
100 watts
175 watts
(Ref. 1 kHz at rated output
power)
better than 20 Hz — 20 kHz
better than 50 Hz — 15 kHz
+1 dB, 20 Hz — 20 kHz
(Ref. 1 kHz, 1 watt output)
+1.5 dB, 50 Hz — 15 kHz
(Ref. 1 kHz, 1 watt output)
+1dB, 20 Hz — 20 kHz
(Ref. 1 kHz, 100 mVrms,
10 kQ load)
+1dB, 20 Hz — 20 kHz
(Ref. 1 kHz, 0 dBm output,
600 (2) load)
Total Harmonic Distortion (THD):
Direct Output:
Transformer Output:
Link Output:
Preamp Output:
Intermodulation Distortion:
Direct Output:
<0.05%, 20 Hz — 20 kHz
(Ref. 1 kHz, rated output
power, 30 kHz low-pass filter)
<1.0%, 50 — 100 Hz
<0.1%, 100 Hz — 20 kHz
(Ref. 1 kHz, rated output
power, 30 kHz low-pass filter)
<0.05%, 20 Hz — 20 kHz
(Ref. 1 kHz, 100 mVrms
output, 10 kQ load, 30 kHz
low-pass filter)
<0.05%, 20 Hz — 20 kHz
(Ref. 1 kHz, 0 dBm output,
600 © load, EQ flat,
compressor/limiter off,
30 kHz low-pass filter)
(SMPTE 4:1)
less than 0.1% at rated
power)
Input Sensitivity / Input Impedance:
(For rated output power, Ref. 1 kHz, 0 dBu = 0.775 Vrms)
Using 1780A/1780AT:
(balanced, no pad)
Using 1780A/1780AT:
(balanced, w/pad)
Using 1781A:
(balanced)
Using 1781AT:
(balanced)
Using 1781A+ 1785A:
(balanced)
0.3 to 100 mVrms / 10 KQO
(-68 dBu to -18 dBu)
3 mVrms to 1 Vrms / 10 kQ
(-48 dBu to +2 dBu)
0.3 to 100 mVrms / 10 KQO
(-68 dBu to -18 dBu)
0.1 to 30 mVrms / 600 2
(-78 dBu to -28 dBu)
0.1 to 30 mVrms / 6000
(-78 dBu to -28 dBu)
Link Input:
(unbalanced)
Amplifier Input:
(unbalanced)
Rated Output Level /
Minimum Load
Impedance:
Link Output (unbal):
Preamp Output (unbal):
Auxiliarv Output (unbal):
Direct Output:
1707C:
1715C:
Transformer Output:
1707C:
1715C:
Damping Factor:
Direct Output:
Signal-to-Noise Ratio:
Direct Output:
(master at minimum)
Direct Output:
(master at maximum)
Link Output:
Preamp Output:
Protection Systems:
Amplifter:
Load:
External DC Supply:
Mainframe:
Equalization:
Bass:
Treble:
100 mVrms / 10 kN
(-18 dBu)
0.775 Vrms / 10 kQ
(0 dBu)
(Reference 1 kHz)
100 mVrms (-18 dBu), 2 kQ
0 dBm, 600 (2 min. load
0 dBm, 600 (2 min. load
Unbalanced
24.5 Vrms / 8 () min. load
24.5 Vrms / 4 Q min. load
Balanced
17.4 Vrms / 4.0 Q min load
25.0 Vrms / 8.3 0 min load
70.7 Vrms / 66.62 min load
25.0 Vrms / 4.2 Q min load
34.6 Vrms / 8.0 Q min load
70.7 Vrms / 33.3() min load
>40, 20 Hz — I kHz
> 105 dB below rated
output power, À weighted.
>80 dB below rated output
power, Å weighted.
>75 dB below 100 mVrms
output, À weighted.
>75 dB below 0.775 Vrms
output, A weighted,
EQ defeated, compressor /
limiter off.
e Short circuit current
limiting.
€ Over voltage limiting.
€ Thermal Sensing.
e Spurious oscillatory
protection.
e Low AC line sensing.
e Output DC detection.
e Subsonic detection.
e Tum-on/tum-off
transients.
(approx 3 seconds)
e DC input fuses.
e AC line fuse.
Shelving Tvpe.
+12 dB at 100 Hz.
+12 dB at 10 kHz.
Note: 0 dBm into 600 (2 vields 0.775 Vrms.

Compressor / Limiter:
Threshold:
Compression Ratio:
Release Time:
Tone Generator:
Tones:
Control:
Level adjustment:
Connectors:
Inputs:
Amplifier Input:
Link input:
Batterv:
Outputs:
Amplifier Output:
Preamp Output:
Link Output:
Auxiliary Input:
Control:
Mute and
Tone Generator:
Controls:
Front Panel:
Input:
Compressor/Limiter:
EQ Controls:
Output:
Miscellaneous:
Rear Panel:
Tone Generator:
Indicators:
Front Panel:
Microphone
Phantom Power:
Power Requirements:
AC Mains:
1707C:
1715C:
Feedforward Topology
-20 dB to +20 dB
Continuously variable.
(Ref. 100 mVrms on Link
input.)
1:1 to o:1,
Continuously variable.
50 msec to 5 sec.
Continuously variable.
Electronically produced
Buzzer, siren, single-tone
chime, and repeating tone
chime.
All tones are initiated by
remote switch closures.
Rear panel.
l — RCA phono receptacle
I — RCA phono receptacle
3-terminal barrier strip
7-terminal barrier strip
I — RCA phono receptacle
1 — RCA phono receptacle
1 — RCA phono receptacle
Screw Terminals (7)
6 Input Level adjust
I Release Time adjust
(screwdriver slotted)
I Threshold adjust
(screwdriver slotted)
I Compression Ratio adjust
(screwdriver slotted)
1 On/Off Switch
] Bass adjust
1 Treble adjust
1 EQ In/Defeat switch
I Master Level adjust
1 AC Power switch
1 Output Level adjust
(screwdriver slotted)
6 Green LED's, (Nominal
Input Level)
6 Red LED's, (Peak Input
Level)
1 Red LED, Main power
output CLIP)
I AC Power ON
48 VDC @ 200 milliamps
consumption
(Ref. 1 kHz, rated output
with no modules installed
100, 120, 200, 220 or
240 VAC.
165 watts maximum.
100, 120, 200, 220 or
240 VAC.
320 watts maximum.
Power Requirements:
Battery:
1707C:
1715C:
Power Consumption and
Heat Produced:
1707C:
75 watts output:
25 watts output:
1715C:
150 watts output:
50 watts output:
Operating
Temperature Range:
Dimensions: Width:
Height:
Depth:
Net Weight:
1707C:
1715C:
Finish Color:
Included Accessories:
4 — Operating/Service Instruction documents. One
each for the Mainframe, 1780A/AT, 1781 A/AT,
and 1783.
+48 VDC bipolar,
1.5 amps maximum.
+48 VDC bipolar,
3.0 amps maximum.
165 watts consumed.
306 BTU/hour.
130 watts consumed.
357 BTU/hour.
320 watts consumed.
578 BTU/hour.
230 watts consumed.
612 BTU/hour.
Up to 50?C (1227F)
19 inches (48.3 cm)
5/4 inches (13.3 cm)
3 standard rack units.
13 inches (33.0 cm)
25 Ibs. (11.4 kg)
32 Ibs. (14.5 kg)
Black
1 — Shorting Bar (Installed on Direct Output to
OT in).
I — "U" Shorting Bar (Installed on Preamp Out to
Amp In).
4 — Rubber Feet (installed).
I — System Configuration Label installed on top
cover.
1 — International fuse.
] — International 220/240 VAC voltage sticker.
| — International Fuse sticker.
1 — Rack mount hardware kit.
Optional Input Output Accessory 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 1785A
600 2 to 10 kN isolation transformer installed.
1783 Line Output Module.
1785A 600 € to 10 kQ Input Isolation
Transformer.
1786 600 (2 to 600 (2 Output Isolation
Transformer.
1791 Female XLR Connector.
1792 Male XLR Connector.
1793 Dual RCA Phono Connector.
1794 5—Lug Screw Terminals.
8751A Programmable 14 Band EQ Module.
Altec Lansing continually strives to improve their products
and performance. Therefore, specifications are subject to
change without notice.
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