TOA U-14R User manual
INPUT PRIORITY MODULE
U-14R
1. GENERAL DESCRIPTION
The U-14R is a plug-in type Input Priority module designed to
be used in conjunction with TOA's 900 Series and BG-1000
Series amplifiers.
The U-14R is equipped with 2 inputs: BGM and JUKE, and the
JUKE input has priority over the BGM input. BGM signals are
only output when an input is received. Output automatically
switches over to JUKE signal input when JUKE signals are
received. The threshold level for output switching when a
JUKE signal input is detected can be adjusted.
Each of BGM and JUKE inputs has both L (white jack) and R
(red jack) inputs, which are internally mixed and output. The
JUKE input is equipped with an AGC, which maintains a
uniform output level for varying input signal levels.
The output level for BGM and JUKE inputs can be
independently adjusted. When the U-14R is used with a 900
Series amplifier, its outputs (both BGM and JUKE) can be
turned off using the two MUTE BUS signal channels.
When the U-14R is used with a 900 Series amplifier, if a mute
signal is received from the connected external component, the
U-14R operates as shown in the following table, depending on
how the circuit board's MUTE 1 and MUTE 2 jumper wires are
connected:
MUTE 1
jumper wire
MUTE 2
jumper wire
U-14R operation (signal output)
Connected
Connected
Normally enabled (ON).
Disabled (OFF) when the
amplifier's MUTE 1 or MUTE 2
terminal is shorted. (Factorypreset setting)
Connected
Cut
Normally enabled (ON).
Disabled (OFF) when the
amplifier's MUTE 1 terminal is
shorted.
Cut
Connected
Normally enabled (ON).
Disabled (OFF) when the
amplifier's MUTE 2 terminal is
shorted.
Cut
Cut
Operates as an ordinary input
module. (No mute function
operable.)
2. CONNECTIONS AND SETTINGS
Connect each external component output to the BGM and
JUKE inputs. Use the BGM level control to adjust the BGM
output level, and the JUKE level control to adjust the JUKE
output level. Output level increases as the control is turned
clockwise.
The JUKE input's threshold level can be adjusted with the
GATE threshold level control. Turning the GATE control
clockwise increases sensitivity, allowing the BGM output to be
switched over to the JUKE signal at a lower signal level.
Jukebox gate threshold level control
3. SPECIFICATIONS
Input
47 kΩ (unbalanced)
Maximum Output
+14 dB* (5 Vrms)
Distortion
BGM: 0.03% (1 kHz, 1 Vrms)
JUKE: 0.05% (1 kHz, 1 Vrms)
Frequency Response
20 – 20,000 Hz ±1 dB
Output Level Variable
Range
BGM: –24 to –4 dB*
(–10 dB* input to L and R)
JUKE: –24 to –4 dB*
(–10 dB* input to L and R)
JUKE Gate Threshold
Level Variable Range
–60 to –30 dB (input to L and R)
Jukebox level control
BGM level control
From BGM Tuner Output
From Jukebox Output
* 0 dB = 1 V
Printed in China
133-12-865-90
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