Altec Lansing 1715C User Manual
1707C/1715C
Six Channel Mainframe
Mixer/Power Amplifier
KEY SYSTEM SPECIFICATIONS
KEY FEATURES
'k Six ports for inputs or outputs
★ Offers systemwide remote muting
'A' Built-in compressor/limiter
Frequency Response:
Direct Output:
Preamp Output:
Total Harmonic
Distortion (THD):
Direct Output:
Preamp Output:
Signai-to-Noise Ratio:
Direct Output:
(master at maximum)
Preamp Output:
(Ref. 1 kHz)
±1 dB, 20 Hz - 20 kHz
(1 watt output)
±1 dB, 20 Hz - 20 kHz
(0.775 Vrms output, 600 fl
load)
(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 fl
load, EQ flat, compressor/limiter off, 30 kHz low-pass
filter)
>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/amplifier 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. As a result, it is the choice for
use in professional Installations requiring high
quality, flexibility in design, and low cost.
1707C/1715C Specifications (cont'd)
Continuous Average
Power;
1707C
1715C
Maximum Midband
Output Power
1707C
1715C
Power Bandwidth:
Direct Ou^ut:
Intermodulatlon
Distortion:
Direct Output:
Damping Factor:
I^ect Output:
Rated Output Level:
Direct Ou^ut:
1707C:
1715C:
Pre2unp Output:
Transformer Output:
1707C:
1715C:
Equalization:
Betss:
Treble:
CompressorA.lmiter:
Threshold:
Compression Ratio:
Release Time:
Tone Generator:
Tones:
Control:
Level Adjustment:
Protection System:
Amplifier:
Load:
Front Panel Controls:
Input:
Compressor/Limiter:
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)
(unb2dauiced)
24.5 Vrms/8 ft load
24.5 Vrms/4 ft load
(unbalauiced)
0 dBm, 600 ft min. load
(baleinced)
17.4 Vrms/4 ft load
25.0 Vrms/8 ft load
70.7 Vrms/66.6 ft load
25.0 Vrms/4.2 ft load
34.6 Vrms/8 ft load
70.7 Vrms/33.3 ft load
(Shelving type)
±12dBat 100 Hz
±12dBat 10 kHz
Feedforward Topology
-20 dB to -H20 dB
Continuously variable
(Ref. 100 mVrms on Link input)
1:1 to »:1
Continuously vetfiable
50 msec to 5 sec.
Continuously variable
Electronically produced
Buzzer, siren, single-tone chime,
auid repeating tone chime
All tones are initiated by
external switch closures
Reau- panel
• Short circuit current limiting
• Over voltage limiting
• Thermal sensing
• Spurious oscillatory protection
• Low AC line sensing
• Ouq:>ut DC detection
• Subsonic detection
• Tum-orVofftrainsients (=3 secs)
6 - Input Level adjust
1 - Release Time adjust
1 - Threshold adjust
1 - Compression Ratio adjust
EQ Controls:
Output:
Miscellameous:
Rear Panel Controls:
Tone Generator:
Front Panel Indicators:
Connectors:
Amplifier Input:
Link Input:
Battery:
Amplifier Output:
Preamp Output:
Link Output:
Mute auid Tone Generator:
Power Requirements:
AC Madns:
Battery:
1707C
1715C
Power Consumption
and Head 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 Mainframe:
1 - Operating/Service Instructions for Maiinframe,
1780A/AT, 178 WAT and 1783
1 - Preamp Out to Amp In “U” Shorting Bar
1 - Direct Output to OT in Shorting Bair
1 - System Configuration Label
1 - Intemationad 220/240 VAC voltage decal
1 - Intemationad Fuse deced and fuse
1 - Rack mount hairdwaire kit
Altec Lansing continuadly strives to improve their products and
performaince. Therefore, specifications aue subject to change
without notice.
1 - On/Off switch
1 - Baiss adjust
1 - Treble adjust
1 - EQ In/Defeat switch
1 - Maister Level adjust
1 - AC Power switch
1 - Output Level adjust
6 - Green LED’s (Nominad Input)
6 - Red LED’s (Peaik Input)
1 - Red LED (Maiin Output clip)
1 - AC Power ON
1 - RCA phono receptacle
1 - RCA phono receptacle
1 - 3-terminad bairrier strip
1 - 7-terminad bairrier strip
1 - RCA phono receptacle
1 - RCA phono receptacle
7 - Screw terminails
(Ref. 1 kHz, rated output
with no modules installed)
100/120/200/220/240 VAC,
50/60 Hz.
±48 VDC bipolair
1.5 amps maiximum
3.0 aunps maiximum
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'A inches (13.3 cm)
13 inches (33.0 cm)
25 lbs. (11.4 kg)
32 lbs. (14.5 kg)
Black
1780A/1780AT
Description
The Altec Lansing 1780A/1780AT Mic/Line Input
modules combine basic microphone preamplifi
cation with tme line level input capability. The
module heis a built-in resistive pad to permit levels
in excess of 0 dBu and its high input impedance
easily 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 -I- R stereo summing, and 0 to 50 dB
of continuously variable gain. Included in the
1780AT version is a 10 kii input bridging trans
former for those who prefer transformer isolation.
1780A/1780AT Specifications
Block Diagram of the 1780A/1780AT Input Module
Gain:
Input Sensitivity:
Without Pad: -68 dBu to -18 dBu
With Pad: -48 dBu to -1-2 dBu
Input Impedance:
1780A: lOkil
1780AT: lOkil
With 1793 Dual Phono: 40 kn
Frequency Response: 50 Hz - 20 kHz, ±1 dB
Total
Harmonic Distortion: (Ref. minimum gain,
1780A: <0.01%
1780AT: <0.025%
Equivalent Input Noise: <-120 dBr
0-50 dB, continuously
Vciriable
(.3 mVnns to 100 mVrms)
(3 mVrnis to 1 Vnns)
50 Hz - 20 kHz mecisurement
bandwidth, 30 kHz low-pass
filter)
(Ref. 0 dBr = 100 mVrms out
put, 10 kil load, 200 il input
termination, maximum gain,
A-weighted)
High Pass Filter:
Comer Frequency: 300 Hz
Slojje: 12 dB/octave
Controls: 1 - Gain, continuously
variable
Weight (Net):
1780A:
1780AT: 3.0 oz. (85 g)
Power Supply
Requirements: ±18VDCat 15maIX:
Included Accessories: 1 - 2-pin female jumper
2.5 oz. (70 g)
(supplied by meiinframe)
(for phemtom jxiwer)
2 - mounting screws
(for potentiometer bracket)
1 - Operating Instmctions
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 phaptom 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.
1781A/1781AT Specifications
Block Diagram of the 1781A/1781AT Input Module
Gain:
1781A: 0 dB - 50 dB,
continuously Vciriable
1781 AT: 10 dB - 60 dB,
continuously varicible
Input Sensitivity: (Ref. 1 kHz, 10 kfi load) Equivalent Input Noise:
1781 A: -68 dBu to -18 dBu
(0.3 mVrms - 100 mVrms)
1781 AT:
Input Impedance: (Ref. 1 kHz)
Electronically beilanced: >8 kfi
Transformer balanced:
With 1793 Dual Phono
Connector Installed: >39 kfi
Frequency Response: (Ref. 1 kHz, 100 mVrms
1781A:
±1 dB (minimum gaiin):
± 1 dB (maximum gain):
1781AT:
±1 dB (minimum g2un): 20 Hz - 20 kHz
±1 dB (meiximum gedn): 50 Hz - 15 kHz
-78 dBu to -28 dBu
(0.1 mVrms - 30 mVrms)
200 fl - 600 fi
output, 10 kfi load)
20 Hz - 20 kHz
50 Hz - 20 kHz
Total Harmonic
Distortion (THD): (Ref. 1 kHz, 100 mVrms
output, minimum gain, 10 kfi
load, 30 kHz low p>etss filter)
20 Hz - 20 kHz: <0.03%
(Ref. 0 dBr = 100 mVrms
output, 10 kfi load, 200 fi
input termination meiximum
getin, A-weighted)
<-120 dBr
High Pass Fiiter (Low Cut):
Comer Frequency: 320 Hz
Slope: 6 dB/oct (20 dB/dec)
Low Pass Filter (High Cut): (Ref. 100 mVrms output,
Comer Frequency: 5 kHz
Slope: 6 dB/oct (20 dB/dec)
Attenuation: (Ref. 100 mVrms output.
Mute:
(Ref. 100 mVrms output,
minimum geiin, 10 kfi load)
(>10dBat 100 Hz)
minimum gciin, 10 kfi load)
(>6 dB at 10 kHz)
minimum gain, 10 kfi load)
>60 dB
(10 kfi remote)
1783
Description
Special Ordering Instructions
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
vciriable output level control is local to the module
permitting independent adjustment of each line
output.
1783 Specifications
Output Source
Impedance:
Nominal Output Level
/Load Impedance:
Maximum Output
Level:
<50 n
+8 dBm
(Ref. 1 kHz, 0 dBm = 0.775
Vrms with 600 il load, output
level control at maximum, 100
mVrms input)
+24 dBm
NOTE: 77ie modules listed below are required
for use with the I707C/I7I5C and must be
ordered separate from the mainframe.
Plug-in Input Modules:
1780A Mic/Line Input module
1780AT Mic/Line Input module with 10 ki)
bridging transformer installed
1781A Programmable Input module
1781AT Programmable Input module with
model 1785A 600 H to 10 kfl
isolation transformer installed
1785A 600 n to 10 ki) 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:
875LA Programmable 14-Band EQ module
NOTE: Each module selected requires one of
the following connectors also be ordered:
Frequency Response:
±1 dB:
Total Harmonic
Distortion (THD):
20 Hz - 20 kHz:
Signal to Noise Ratio:
Power Requirements:
1786 Output Isolation Transformer
Impedance Ratio: 1:1 (600 il:600 Cl)
Frequency Response:
±1 dB:
Total Harmonic
Distortion (THD):
20 Hz - 20 kHz:
50 Hz - 20 kHz:
(Ref. 1 kHz, +8 dBm output)
20 Hz - 25 kHz
(Ref. 1 kHz, +8 dBm output,
output level control at maxi
mum, 30 kHz low peiss filter)
<0.05%
>88 dBm
(Below +8 dBm output, out
put level control at maximum,
A-weighted)
±18 VDC at 20 mA
(supplied by mainframe)
(Ref 1 kHz, +18 dBm output)
20 Hz - 20 kHz
Ref 1 kHz, +18 dBm output)
<0.5%
<0.1%
1791
Female XLE
1793
Dual RCA Phono
-.'■i.V ■■
1792
Male XLR
,K., /¡3^1... tif
v
1794
5- 1
CONFIGURING THE MAINFRAME
The Mainframe's Inner Workings
USER INSTALLED STRAPS
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 vwth a microphone or other
high level device. The mixer/power amplifier mainfreune shedl include a compressor/limlter, low and
high frequency sheMng 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 il direct
output), or 150 watts (1715C) at less than 0.05% THD
from 20 Hz to 20 kHz (4 il direct output). Frequency
Response: 20 Hz to 20 kHz, ±I dB (direct output).
Source Impedance: 150 ft to 250 ft nominal with a
microphone preamplifier, 600 ft with a bridging
transformer, 150 ft to 600 ft with a line matching
transformer, and greater than 30 kft vwth a tape
preamplifier. Equivalent Input Noise: <-120 dBr with
M8V DC INPUT
a low impedance microphone preamplifier. Output
Noise: <-85 dBm (wth all controls off).
The mixer/power amplifier shall be rack mountable
and finished in black. The amplifier’s dimensions
shall be SVa" (H) x 19" (W) x \2Va” (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 Une
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.
a MARK IV company
P.O. BOX 26105 • OKLAHOMA CITY, OK 73126-0105 • U.S.A. • 405/324-5311 or FAX: 405/324-8981
© 1992 ALTEC LANSING CORPORATION
PRINTED IN U.S.A. 7/92 Revision 1
42-07-029244
LAISISIISIG
/Ac Jid of
1707C & 1715C
Mixer/Power Amplifiers
Operating and Service Instructions
ALTEC LANSING CORPORATION
a MARK rV company
P.O. Box 26105 • OKLAHOMA CITY, OK • 73126-0105 • 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
Parts List
Page
3,4
5
5
5
6
6
6
7
7
8
8
8
8
8
8
8
9
9
10,11
10
10
10
10
10,11
13
14
14
14
14
14
14
15-18
List of Tables and Figures
Table I. AC Line Voltage Selection and Strapping Chart
Table II. AC Fuse Selection Chart
Table III. 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
5
5
8
5
5
5
6
6
6
7
8
8
8
9
9
10
11
Gatefold
Description
The 1707C and 1715C Mixer/Power Amplifiers offer a will be muted,
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
Specifications
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:
Total Harmonic Distortion (THD):
Direct Output: <0.05%, 20 Hz - 20 kHz
Transformer Output: <1.0%, 50 - 100 Hz
link Output: <0.05%, 20 Hz - 20 kHz
Preamp Output: <0.05%, 20 Hz - 20 kHz
Intermodulation Distortion: (SMPTE 4:1)
Direct Output: less than 0.1% at rated
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 178 lAT:
(balanced)
Using 1781A-H785A:
(balanced)
75 watts
150 watts
(Reference 1 kHz at 1% 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, I watt output)
±1.5 dB, 50 Hz - 15 kHz
(Ref. 1 kHz, 1 watt output)
±ldB, 20 Hz - 20 kHz
(Ref. 1 kHz, 100 mVrms,
10 kil load)
±ldB, 20 Hz - 20 kHz
(Ref. 1 kHz, 0 dBm output,
600 n) load)
(Ref. 1 kHz, rated output
p>ower, 30 kHz low-p>iiss filter)
<0.1%, 100 Hz - 20 kHz
(Ref. 1 kHz, rated output
jxjwer, 30 kHz low-pass filter)
(Ref. 1 kHz, 100 mVrms
output, 10 kil load, 30 kHz
low-pass filter)
(Ref. 1 kHz, 0 dBm output,
600 fl load, EQ flat,
compressor/limiter off,
30 kHz low-p>ass filter)
power)
0.3 to 100 mVrms / 10 kil
(-68 dBu to -18 dBu)
3 mVrms to 1 Vrms / 10 kil
(-48 dBu to -f-2 dBu)
0.3 to 100 mVrms / 10 kil
(-68 dBu to -18 dBu)
0.1 to 30 mVrms / 600 il
(-78 dBu to -28 dBu)
0.1 to 30 mVrms / 600 il
(-78 dBu to -28 dBu)
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 p)ower amplifier.
A multi-tone generator eind a compressor/limiter are
also provided.
Input Sensitivity / Input Impedance:
Link Input:
(unbalanced)
Amplifier Input:
(unbalanced)
Rated Output Level /
100 mVrms / 10 kil
(-18 dBu)
0.775 Vrms / 10 kil
(0 dBu)
(Reference 1 kHz)
Minimum Load
Impedance:
Link Output (unbal):
Preamp Output (unbal):
Auxiliary Output (unbal):
Direct Output:
1707C:
1715C:
Transformer Output:
1707C:
1715C:
100 mVrms (-18 dBu), 2 kil
0 dBm, 600 il min. load
0 dBm, 600 il min. load
Unbalanced
24.5 Vrms / 8 il min. load
24.5 Vrms / 4 il min. load
Balanced
17.4 Vrms / 4.0 il min load
25.0 Vrms / 8.3 il min load
70.7 Vrms / 66.6il min load
25.0 Vrms / 4.2 il min load
34.6 Vrms / 8.0 il min load
70.7 Vrms / 33.3il min load
Damping Factor:
Direct Output:
>40, 20 Hz - 1 kHz
Signal-to-Noise Ratio:
Direct Output:
(master at minimum)
Direct Output:
(master at maximum)
Link Output:
Preamp Output:
> 105 dB below rated
output power, A weighted.
>80 dB below rated output
power, A weighted.
>75 dB below 100 mVrms
output, A weighted.
>75 dB below 0.775 Vrms
output, A weighted,
EQ defeated, compressor /
limiter off.
Protection Systems:
Amplifier:
Load:
External DC Supply:
Mainframe:
Equalization:
Bass:
Treble:
Note: 0 dBm into 600 il yields 0.775 Vrms.
• Short circuit current
limiting.
• Over voltage limiting.
• Thermal Sensing.
• Spurious oscillatory
protection.
• Low AC line sensing.
• Output DC detection.
• Subsonic detection.
• Tum-on/tum-off
transients.
(approx 3 seconds)
• DC input fuses.
• AC line fuse.
Shelving Type.
±12 dB at 100 Hz.
±12 dB at 10 kHz.
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