Boston Acoustics GT-424-Channel - Manual (Page 5)

5
Control Functions (cont.)
“Q” Control
“Q” Control is active when the highpass crossover is engaged and is centered
on the selected crossover point. The range of operation is 0.7–1.2.
REAR RCA Inputs
RCA cables marked “REAR” from head unit or other line level device should be
connected here. Use both inputs (L & R) for stereo.
REAR Remote Input
This remote input is parallel to the FRONT remote input and does not need to
be connected for the amplifier to operate. Use either remote input to turn the
amplifier on. Do not connect 12V accessories to this input.
REAR Input Switch
In the left position, the L & R inputs go to the REAR L & R channels of the ampli-
fier. In the right (MONO) position, the inputs are summed. Use this setting when
the REAR channels are used with a subwoofer.
Lowpass Slope and Crossover Controls
Select appropriate crossover slope of 12 or 24dB/octave by
moving LOWPASS SLOPE switch. Lowpass crossover fre-
quencies are adjustable from 50Hz to 350Hz by rotary control.
Move filter switch to “ON” position to engage.
Status LED Indicators
GREEN indicates the normal operating condition; the amplifier is “ON.” GREEN
and RED together are normal when the amplifier is first turned “ON”; RED will
turn off after a few seconds. When both GREEN and RED remain on, the ampli-
fier is in thermal shutdown condition. RED only indicates a fault condition, “SAFE.”
7
8
6
7
8
10
11
9
(tuned crossover frequency)
0dB
+1.6dB
-3dB
t
1.2 .95 .707
dB
Q
L OW PA S S S L O P E
1 2 d B 2 4 d B
M O N O
1 2 d B
S T
L OW PA S S
O F F O N
5 0
3 5 0
H z 2 0 0