Altec Lansing 1707C - Mainframe Overview and Specs; Specifications

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.