Altec 1684a manual

Page 2

DESCRIPTION (continued)

allows the system to sound natural with the clarity
of a manual mixer controlled by a human operator.
This gives the system the live sound of room ambi-
ence without the audible gating of microphone
channels. A muting mode of operation is avail-
able for those installations where channel attenua-
tion is necessary. The patented circuitry allows
easy system setup with only one front panel vol-
ume control for each channel. It also adjusts the
NOM=1 function from 0 dB to 20 log NOM dB
automatically without any manual setup.

The packaging of the 1684A is distinctive.
The standard unit comes from the factory with four

channels installed. It is expandable up to eight
channels with the addition of up to four 1681A
automatic input modules, each sold separately.
This packaging approach allows the contractor to
tailor the 1684A to each installation. Each
1681A can be easily inserted by removing the top
panel, sliding the input card into the card guide,
and connecting the bus cable. This greatly simpli-
fies future system expansion.

The ALTEC LANSING 1684A Automatic
Microphone Mixers increased performance and
flexibility meets the expanding mixing needs of the
ever-changing commercial audio industry.

SPECIFICATIONS (continued)

Measurement Conditions

1. 120 Vrms, 60 Hz line voltage maintained
throughout testing.
2. O dBu = 0.775 Vrms.

Maximum Voltage Gain:
Channel Input (Mic) to Line Output: 54 dB
Channel Input (Line) to Line Output: 0 dB

Channel Input to Premix Output: 75 (13
Channel Input to Mix Output: 78 dB
Channel Input to Main Output: 83 dB
Premix Input to Premix Output: 0 dB
Mix Input to Mix Output: 0 dB
Mix Input to Main Output: 14 dB

Minimum load Impedance:
Main Output: 600 ohms
Line Output: 10K ohms
Premix Output: lOK ohms
Mix Output: 10K ohms
Maximum Output level:
Main Output: +21 dBm
line Output: +23 dBu
Premix Output: +23 dBu
Mix Output: +23 dBu

Phantom Power Voltage: +18 Vdc
Dimensions:
Height: 3.5 inches (8.9 cm)
Width: 19 inches (48.3 cm)
Depth: 12 inches (30.5 cm)
Weight: 14 lbs (5.5 kg)

Power Requirements: 115/230 Vrms (switchable), 20 W