Toa A-903A, Руководство по эксплуатации, Страница: 4 / 15

TOA NEW 900 SERIES
Input Connections
This unit has six INPUT PORTS for PLUG-IN MODULES. Select
the desired ones for each application.
Plug the modules into INPUT PORTS, sliding them between the
guide rails, and secure each with two screws.
When not all INPUT PORTS are occupied, cover the vacant
PORTS with blank panels, and secure them with screws.
PLUG-IN MODULES are provided in the following:
Balanced low impedance microphone
premp module (with presettable low-cut
filter, high-cut filter and gain controls)
Balanced low impedance microphone
preamp module (with presettable low-cut
filter and gain controls)
Equalized mag. phono preamp. module
(with presettable gain control)
Unbalanced high impedance auxiliay
preamp module (with presettable
gain control)
Balanced 10k
Balanced 600
bridging transformer module
line matching
transformer module
Balanced paging input module
(with presettable gain control and MUTE Delay)
Balanced 600 line output module
(with presettable gain control)
Signal tone generator module
(with presettable output level control)
1kHz sine wave
Yelp and buzzer
One-tone chime and continuous one-tone chime
H-01, H-21, H-31
H-02, H-22, H-32
E-01, E-11
X-01, X - 1 1 , X-21
B-01 , B-11
L-01, L-11, L-41
I-01
T-01
S-01
S-02
S-03
*With H-21 , H-22 and X-21 modules employing volume remote
control functions, connecting a potentiometer (10k ohms) to the
terminal of any of these modules permits the sound volume to be
remotely controlled by means of the connected potentiometer.
* H-31 and H-32 modules incorporate muting functions. If a switch
is connected to MUTE TERMINAL on the rear panel of the ampli-
fier and closed, these input signals can be passed through. When
the switch is opened, the input signal is muted.
* E-11, X - 1 1 , B-11 and L-11 modules incorporate muting functions.
If a switch is connected to MUTE TERMINAL on the rear panel
of the amplifier and closed, these input signals can be muted.
* L-41 incorporates signal activated muting function. Incoming
input signal causes mute terminal to be grounded.
* T-01 is used to feed out mixed signals to external equipment.
*T-01 should be inserted only in INPUT PORT #5 or #6.
(See PLUG-IN MODULES for details)
The speaker outputs of the amplifier are 4
, 8 , 25V (21
) and
70V (167 ).
Connect speakers to one of these outputs.
Class 2 wiring may be used.
Since these outputs consist of 4 , 25V and 70V via the output
transformer (matching transformer) and direct output of 8 , the
connecting method differs in each case.
See the following diagrams.
Note: Impedances indicated below imply total speaker system
(load) impedances.
When connecting speakers to any one of the outputs of 4 ,25V
or 70V
(BALANCED TRANSFORMER OUTPUT);
Note:
In this case, the LOW-CUT SWITCH should be in "CUT" posi-
tion. This amplifier is characteristically flat even in the low
frequency range. Therefore, in TRANS OUTPUT, the acoustic
effect and frequency-response characteristics may be altered.
In TRANS OUTPUT, cut off unnecessary low frequency to
obtain the best acoustic condition.
When connecting speakers to the 8 output.
(UNBALANCED DIRECT OUTPUT);
Output Connections A-903A
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