JBL S5160 - Manual (Page 7)

7
Quiet Cooling
The S5160 utilizes a fan to cool the amplifier channels,
ensuring long-term reliability. To reduce fan noise to an
absolute minimum, a thermal sensing and control circuit
that senses increases
in temperature within the amplifier
and powers a fan at a speed proportional to that tempera-
ture increase has been incorporated in the S5160. When
the S5160 is used at lower volume levels, the fan turns
very slowly – and quietly. At high listening levels (and the
higher operating temperatures this creates within any
amplifier), the sensing circuitry causes the fan to turn
faster, producing increased cooling. As a result, the fan
is never turning faster than necessary, and most of the
noise that is generated is masked by the program being
listened to.
Comprehensive and Isolated Circuit Protection
The S5160 amplifier employs sophisticated protection cir-
cuitry (one for each channel) that senses many possible fault
conditions, such as shorted loudspeaker wires or excess
power demand, and turns the affected channel(s) and their
blue front-panel indicators off until the fault condition is
removed, at which time normal operation is automatically
restored. While protection of this sort is not uncommon in
today’s well-designed amplifiers, a remarkable feature of
the S5160’s protection circuitry is that it is optically cou-
pled to the signal circuit; there is no direct electrical con-
nection between the signal path and the protection circuitry.
As a result, there can be no coloration of the
music, no interaction between protection and
amplification, until certain thresholds are
exceeded, at which point the channel(s) turn
off completely.
2.1 Included
Each S5160 amplifier includes the following items packed
in the carton. If any of these items is missing, please con-
tact your JBL Synthesis dealer or distributor, or visit our
Web site at www.jblsynthesis.com.
One (1) detachable power cord
One (1) 6-foot 5-pin DIN trigger cable (M/M)
Two (2) 5-pin DIN/2-pin bare wire adapters
Two (2) 2-pin bare wire plugs
Owner’s manual
2.0
INTRODUCTION
AND FEATURES
S5160 OM 5/31/05 2:15 PM Page 7