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1781A & 1781AT Mic/Line Input Module

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The mixer also contains two auxiliary input channels for high-impedance line or tape sources. These channels have independent monitor sends, pan pots, and slide faders.

DESCRIPTION


Input Module. The ALTEC LANSING 1781A programmable input module accepts either mic or line level signals through a wide variety of connector interfaces. Standard features include an electronically balanced input stage with adjustable gain, continuously variable high and low pass filters, RFI protection, 36 volt phantom powering two levels of muting, and remote control capability Programming is accomplishedwith plug-in jumpers which may select phantom power (on or off), mute priority or slave, or remote volume control. Optionally available is the ALTEC LANSING 1785A input isolation transformer which provides an additional 10 dB of gain for improved sensitivity. ALTEC LANSING also offers the 1781AT, a programmable input module with a 1785A Transformer installed.

SPECIFICATIONS


1781A PROGRAMMABLE INPUT MODULE
Gain: 0dB-50dl3, continuously variable
10dB-60dBw/1785A
Input Sensitivity (Ret. 1 kHz, 0 dBr = 100 mVrms output, 101<0 load) Without 1785A 0.3 mVrms - 100 mVrms
(-50 dBr to 0 dRr)
With 1785A installed 0.1 mVrms - 30 mVrms
(-60 dBr or -10 dBr)
Input Impedance (Ref. 1 kHz)
Electronically balanced >8 kQ
Transformer balanced 2000-6000 With 1793 dual phono
connector installed >39 kO
Frequency Response (Ref. 1 kHz, 100 mVrms output, 10 kO load) Without 1785A
±1 dB (Minimum gain) 20 Hz - 40 kHz ±1 dB (Maximum gain) 50 Hz - 40 kHz ±3 dB (Minimum gain) 10 Hz - 80 kHz ±3 dB (Maximum gain) 25 Hz - 80 kHz
With 1785A
±1 dB (Minimum gain) 20 Hz - 25 kHz
:t1 dB (Maximum gain) 40 H7 - 15 kHz
+3 dB (Minimum gain) 10 Hz - 50 kHz
±3 dB (Maximum gain) 20 Hz - 30 kHz
Total Harmonic Distortion (THD): (Ref. 1 kHz, 100 mVrms output, minimum gain, 10 kf2 load, 30 kHz low pass filter)
20 Hz - 20 kHz <0.03%
Equivalent Input Noise: <-120 dBr
(Ref. OdBr = 100 mVrms output, 10 kQ load, 2000 input termination maximum gain, A-weighted)

High Pass Filter (Low Cut): (Ref., 100 mVrms output, minimum gain, 10 kQ load)
FI 320 Hz
(>10 dB at 100 117)
Slope 6 dB/oct
(20 dB/dec)
Low Pass Filter (High Cut): (Ref. 100 mVrms output, minimum gain, 10 W load)
Fh 5 kHz
(>6 dB at 10 kHz)
Slope 6 dB/oct
(20 dB/dec)
Attenuation: (Ret. 1 kHz, 100 mVrms output, 10 kO load)
Mute >60 dB
10 kf2 remote
Optional Accessories: 1785A Input Isolation Transformer
1785A INPUT ISOLATION TRANSFORMER
Voltage Gain: 10 dB
Impedance Ratio: 6000:10 W (Primary: Secondary)
Frequency Response (Ref. 1 kHz, 100 mVrms output)
±1 dB 40 Hz - 20 kHz
+3 dB 20 Hz - 40 kHz
Total Harmonic Distortion (THD): (Ref. 1 kHz, 100 mVrms output)
50 Hz - 20 kHz <0.2%
Insertion Loss: <1 dB (Ref. 1 kHz, 100 mVrms output)
Included Accessories: 2 - Mounting screws
1 - Flat washers


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