The subwoofer amplifier control and connection panel, shown in Diagram 5, provides a range of functions to assist with system integration. These
are explained below.
Powers the subwoofer on or off. When the button is in the inward position, the loudspeaker is powered on. When button is in the outward
position, the subwoofer is powered off.
Sets the overall sensitivity of the subwoofer. Initially, the Level control should be set towards the centre of its range and only adjusted once the
Frequency has been set. If one input is connected, start with the Gain switch set at +
6dB
. If both inputs are connected, start with the Gain switch
set at
0dB
.
A +
10dB
setting is also included. This can be used when working with surround/immersive audio formats that require the
LFE
channel calibrated at
a
10dB
higher
SPL
than the
LCR
channels.
Please refer to Section 9 – Product Specifications for information on system sensitivity.
Sets the overall polarity of the subwoofer and offers an adjustment of the input/output phase. When set to + and 0° the subwoofer will radiate a
positive acoustic pressure for a positive electrical signal at the input. When set to – and 0° the subwoofer will radiate in the opposite polarity to
the input. The Phase control allows for fine adjustment of the phase relationship between subwoofer and satellite speakers. This can be thought of
as a delay, allowing for time alignment with other system elements and is useful when physical adjustment of loudspeaker/sub position is limited.
Varies the low pass crossover frequency as indicated on the control panel. This is the fundamental parameter that defines the integration of the
subwoofer with the satellites. The Frequency control should be set at, or slightly above the specified low frequency cut-off of the satellite speakers.
The “open” setting applies a low pass filter at
320H
z. Select this setting if you will apply the sub low pass crossover filter via an external processor.
All filters are of the type 4th order Linkwitz Riley.
Provides separately buffered and fully balanced outputs with a signal identical to that at the corresponding input terminals. The output is unfiltered
and unaltered in any way, and therefore it is possible to drive a stereo pair of active loudspeakers from these terminals. Likewise, it is also possible
to drive a second Studio Control Subwoofer from these outputs. This function allows for an unlimited number of Studio Control Subwoofers to
be “Daisy Chained” together, one driving the next.
Facilitates remote muting of the subwoofer with the addition of a standard latching footswitch (not supplied, see specification). The Mute light on
the front of the subwoofer will illuminate blue when the Mute function is enabled. If the system includes more than one Studio Control Subwoofer,
a second subwoofer can be controlled from the Thru output socket. This allows for all subwoofers in a system to be controlled simultaneously
from one footswitch. The signal at the Output sockets is not affected.
SECTION FIVE
P o w e r o n / o f f
5.1
Acoustic Transducer Co. Is a trading name and
Is the registered Trade Mark of Loudspeaker Technology Ltd.
RETURN TO
MANUFACTURER
FOR DISPOSAL
Fuse:
115V : T5A H/250V
220-230V : T3.15A H/250V
THERE ARE NO USER SERVICEABLE PARTS INSIDE
CONSUMPTION
MAINS INPUT
50/60 Hz
POWER
500 WATTS MAX.
CHECK VOLTAGE BEFORE USE
Fault
Inputs
Outputs
Left
Right
Left
Right
0
o
180
o
Frequency
Phase
Level (dB)
Gain (dB)
Off
80Hz
65Hz
50Hz
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
0
+6
+10
High Performance
Active Subwoofer
Power
Designed and manufactured by
Acoustic Transducer Company,
Gloucestershire,
GL6 8HR, England
Input
Thru
Footswitch
+
-
Pol.
+10dB - LFE calibration only
+6dB - single input driven
0dB - stereo inputs driven
Serial No.
Voltage
Model
WARNING
!
THIS EQUIPMENT
MUST BE EARTHED
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION
DIA
G
R
A
M
5
L e v e l a n d G a i n
P o l a r i t y a n d P h a s e
F r e q u e n c y
O u t p u t s
F o o t s w i t c h – I n p u t a n d T h r u
5.2
5.3
5.4
5.5
5.6
