Boston Acoustics GT-20 - Manual (Page 5)

5
Control Functions (cont.)
Lowpass Crossover Controls
To use 12dB/octave crossover, move switch to right-hand position. Lowpass
crossover frequency is adjustable from 50Hz to 350Hz by rotary control. (Moving
switch to left-hand position will bypass crossover functions.)
“Q” Control
The “Q” Control is active when the highpass crossover is engaged and is cen-
tered on the selected crossover point. The range of operation is 0.7–1.2.
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.”
6
7
8
(tuned crossover frequency)
0dB
+1.6dB
-3dB
t
1.2 .95 .707
dB
Q