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

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

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

7 7

8 8

8 8 8

9 9

10,11

10 10 10 10

10,11

13 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

5 5 5

8 8

9 9

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)

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.

+ 18 hidden pages