Electro-Voice MI-1 8-Channel Microphone Input Module

Electro-Voice MI-1 8-Channel Microphone Input Module

The MI-1 is an eight-channel microphone input module for use in an Electro-Voice N8000 system. Microphone signals are connected via screw-lockable Euroblock connectors. A-to-D conversion is taken care of by high performance linear 24-bit converters. Internally the signals are processed in 48-bit word length. Up to three MI-1 can be used simultaneously in a N8000.

Key Features

• 118 dB dynamic range - for best audio performance
• Balanced inputs - high common mode rejection prevents long cables from picking up interference
• Gain, PAD, Phantom Power - Input gain in 6 dB steps, PAD for switching input to line level, switchable +48 V phantom power
• Automatic configuration - indication (message) of installation and removal of modules via IRIS-Net software
• EN 54-16: 2008

Technical Specifications

Supply voltage/current
+3.3 V DC, ±0.3 V / 180 mA
+5 V DC, ±0.3 V / 1 A
+18 V DC, ±0.5 V / 400 mA
-18 V DC, ±0.5 V / 150 mA
Audio inputs
8 x 3-pole Euroblock connectors, electronically symmetric
Input level (nominal)
+6 dBu / 1.55 V
Input level (max. before clip)
Microphone
+21 dBu / 8.7 V
Line
+39 dBu / 69 V
Input sensitivity (6 dBu Output, Input Level Control +18 dB)
Microphone
-72 dBu / 195 μV
Line
-54 dBu / 1.55 mV
Input impedance
Microphone
2 kΩ
Line
8 kΩ
Common mode rejection (1 kHz)
Microphone
> 75 dB
Line
> 60 dB
Equivalent Input Noise (EIN)
-129 dBu (A-weighted, 150 Ω source)
Phantom power
+48 V / 10 mA, independently switchable per channel
A/D conversion
24 Bit, Sigma-Delta, 128 times oversampling
Frequency response
20-20000 Hz (-0.5 dB)
Signal-to-noise ratio (A-weighted)
118 dB typical
THD+N
< 0.005%
Sample rate
48 kHz
Data format
24 Bit linear A/D conversion, 48 Bit processing
Signal delay
66 Samples = 1.375 ms at 48 kHz
Electromagnetical environment
E1, E2, E3
Operating temperature
0 Degrees C to 40 Degrees C