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1684A Expandable Automatic Microphone Mixer

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1588B Microphone Preamplifier

SPECIFICATIONS
Type: Plug-in solid-state preamplifier with transformer-isolated input.
Input: (Ref: 0 dBv = 0.775 vrms)
Type: Balanced, Transformer
Input Impedance: 200 ohms
Source Impedance: 150/250 ohms
Maximum Level: -19 dBv (Vcc = 20 VDC,
Gain = 33.5 dB,
f,,,, = 1,000 Hz)
Output: (Ref: 0 dBm = 0.775 vrms across 600 ohms)
Type: Single=ended Internal Source
Impedance: <10 ohms
Load Impedance: >600 ohms
Gain: Variable, user adjustable 33.5
dB maximum, 20 dB
minimum with a resistor wired
between pins
Maximum Output: +14 dBm (Vcc = 20 VDC,
RL = 600 ohms, f,,4 = 30
to 20,000 Hz.)
Distortion: <1% THD, 30 to 20,000 Hz. Frequency Response: 30 to 20,000 Hz, ±1 dB Noise (A-weighted): <-90 dBm for an equivalent
input noise, EIN, of <-124
dBm
Shielding: Mu-metal case provides 90 dB of effective shielding for the input transformer
Operating Temperature
Range: Up to 55°C (131°F)
Power Requirements: From +12 VDC at 13 mA to + 20 VDC at 20 mA
Connector: Octal plug
Dimensions: 1-5/16" (3.33 cm) diameter x
1-13/16" (4.60 cm) seated
height
Weight: 1.5 ounces_


ARCHITECT'S AND ENGINEER'S SPECIFICATIONS


The microphone preamplifier shall be a sealed, plug-in solid-state module with a transformer-isolated input. It shall provide a gain adjustable from 20 dB minimum to 33.5 dB maximum by means of a user selectable resistor wired to terminals 2 and 6 of its mounting socket. It shall be capable of delivering a maximum power output of +9 dBm into a 600 ohm load when +12 VDC is applied or +14 dBm into a 600 ohm load with +20 VDC applied. The total harmonic distortion (THD) shall not exceed 1% from 30 to 20,000 Hz. The frequency response uniformity shall be ±1 dB from 30 to 20,000 Hz. The equivalent input noise (EIN) shall be -124 dBm or better. The input source impedance shall be 150/250 ohms. The output load impedance shall be600 ohms or greater from an internal output impedance of less than 10 ohms. The preamplifier shall be capable of operation in ambient temperatures up to 55°C (131°F). It shall be capable of operation with applied power ranging from +12 VDC at 13 mA to +20 VDC at 20 mA. The case of the module shall be fabricated of mu-metal and shall provide a minimum of 90 dB of magnetic shielding of the input transformer. The circuitry of the module shall terminate in an octal plug. The module shall be 1-5/16" in diameter and have a seated height of 1-13/16" with a weight of 1.5 ounces.
The microphone preamplifier shall be the Altec Lansing Model 1588B.


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