TOA Electronics U-13R - Unbalanced Line Input Module with High/Low Cut Filters and Mute-Receive for 900 Series (Dual RCA) - Manual (Page 7)

MUTING PAGE 7
Muting Defined
Muting occurs when one signal source Overrides , or
“ Mutes ”, a second signal source. In other words, the
first source has Priority over the second source.
For example, a common requirement is for paging to
override a music source.
Mute Buses
There are two main types of 900MK2 muting
modules -
Mute-Receive and Mute-Send .
Both types have mute function circuitry that
connects to
two common " Mute " buses, and one
common " Ground " bus when installed in an A-
900MK2 mixer/amplifier or M-900MK2 mixer/pre-
amplifier. A "
Bus " is simply an internal connection
from module-slot to module-slot. You can access
these buses via rear-panel screw terminals, labeled,
"
MUTE 1 ", " MUTE 2 " and " GND ".
Mute-type modules connect to both mute buses by
default. You can disconnect the module's mute
function circuitry from each mute bus by cutting
jumper wires on the module. This allows you to
configure systems with multiple levels of priority.
Mute Function Activation
By default, Mute-Send modules activate both mute
buses and Mute-Receive modules respond to both
buses.
You can activate the mute bus(es) using either of two
methods:
1. Mute-Send
When input signal level to a Mute-Send module
exceeds a user-adjustable threshold, the module's
mute function circuitry activates the mute function
circuitry of all
Mute-Receive modules connected to
the same bus. This is also referred to as " signal-
activated muting " or " auto-muting ".
2. Switch Activation
A switch closure between the " Mute (1 or 2 )" and
" GND " screw terminals on the rear of the
mixer/amplifier will activate the mute function
circuitry of all
Mute-Receive modules connected to
the same bus. This is also referred to as " manual
muting ".
Module Edge Connector
MUTING