TOA Electronics U-13R - Unbalanced Line Input Module with High/Low Cut Filters and Mute-Receive for 900 Series (Dual RCA) - Manual (Page 9)

M-11
M-21
M-11S Microphone Input with Mute-Receive
• For Balanced, Low Impedance Microphones.
• High and Low Cut Filters for tone control, 4.2 kHz and
330 Hz, 6 dB/octave.
• Phantom Power , +22 VDC for condenser-type
microphones. Active by default, cut Jumper J1 to disable.
• Responds To Mute Bus Activation , via Mute SEND
module or switch-closure.
• Responds To Both Mute Bus # 1 And Mute Bus # 2 By
Default
(cut jumper(s) to disconnect individual mute bus).
• Two Mute Response Modes (cut jumpers to configure):
1. Normally-ON - turns OFF during mute activation
(most common)
2. Normally-OFF - turns ON during mute activation
(functions as an ON/OFF switch, useful for zone-paging
microphones in multi-amplifier systems)
Note: Configure the M-11 Mute Response Mode first - it
will not pass signal by default. See page 35, Jumper
Settings for details.
• Connector: removable terminal block (M-11S).
CONNECTOR DIAGRAM
BLOCK DIAGRAM
SPECIFICATIONS
MICROPHONE INPUT MODULES PAGE 10
M-11S (old style) M-11S (new style)
M-11S (old style) Faceplate Controls Gain, high & low cut filters
PCB Controls Phantom power defeat, mute bus selection
Input Impedance 600 ohms, balanced transformer-isolated
Sensitivity -70 ~ -50 dBu
Gain 32 ~ 52 dB
Noise (EIN) -126 dBu, 200 ohms terminated
M-21S Microphone Input with Remote Volume Control
• For Balanced, Low Impedance Microphones.
• High and Low Cut Filters for tone control, 4.2 kHz and
330 Hz, 6 dB/octave.
• Phantom Power , +22 VDC for condenser-type
microphones. Active by default, cut Jumper J1 to disable.
• Remote Volume Control by connecting an external 10
k
Ω
, linear-taper potentiometer to screw terminals #4 and
#5.
Note: Control line resistance greater than 200
Ω
will
prevent full attenuation (200
Ω
= 3821 ft. of #24 AWG
wire).
• Tip! You can also connect a switch between screw
terminals #4 and #5 for remote on/off operation. Closing
the switch turns the module OFF, opening the switch turns
the module ON.
• Connector: screw terminal (M-21S).
CONNECTOR DIAGRAM
SPECIFICATIONS
BLOCK DIAGRAM
M-21S
M-21S
Faceplate Controls Gain, high & low cut filters, terminals for
10 kohm linear-taper pot.
PCB Controls Phantom power defeat
Input Impedance 600 ohms, balanced transformer-isolated
Sensitivity -70 ~ -50 dBu
Gain 32 ~ 52 dB
Noise (EIN) -126 dBu, 200 ohms terminated
M-11S (new style)