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A.P.I. 500 series microphone amplifier with DI Input.
The features of this microphone amplifier consist of low noise and low distortion. It offers switched gain controls for high accuracy level setting (4 dB steps), D.I. Input (high impedance), level indication, 26dB pads (switchable), phase reversal and 48v phantom supply (switchable).
Frequency response: 10Hz - 150KHz ± 0.25dB   Mic gain range: 22dB - 66dB in 4dB steps.
[pad in -4dB - 40dB]
Distortion: Less than 0.01%
Typ, 0.001% 1KHz @ +20dBu o/p
Phase reversal: Switchable
Noise: 25 microvolts [-110dB ref
+20 dBu. Bandwidth 10Hz-18KHz input loaded 150 ohms, 32dB gain].
Level indication:

Red LED +18dB
Green LED +8dB
Green LED 0dB

48v phantom: Switchable Clipping level:

+29 dBu

26dB pads: Switchable Connectors: Gold plated PCB plug
Input - XLR x 1, Jack x 1 (DI Input)
D.I. input:

High impedance
[1.8 Meg Ohms]

Dimensions: A.P.I. 500 series module (Lunchbox)
D.I. gain range: -8 > 36dB in 4dB steps   Price: P.O.A.
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