Operation; Level Controls; Signal Indicators; Limiters - Bose B1500 Owner's Manual

Power amplifiers
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5. Operation

5.1 Switch on
At Switch-on the protection circuit will initially activate whilst the circuits stabilise.
Assuming no faults are detected after a few seconds only the POWER LED (and
SIGNAL indicators if signal is applied) will illuminate.

5.2 Level controls

These are analogue controls allowing precise level settings. Note that in BRIDGED
mode only channel A control is active.
5.3 Signal indicators (blue LED)
These are active from a minimum output level of approximately 1 Watt (B1500) or
10 watts (B2000) and are an indication only of signal presence.
5.4 Limiters (amber LED)
The B1500 & B2000 amplifiers incorporate signal limiters, which are preset to
prevent clipping with high levels of drive. The amber LED's on the front panel
illuminate to indicate operation of the limiters.
5.5 Fault indicator (Audio Protection
red LED)
If the outputs are shorted or if DC is present, the protection circuit will disengage the
outputs and the Audio Protection (A/P) LED will illuminate. The amplifier will
continue to be monitored and depending on the type of fault, will either reset after the
fault has been cleared or by switching the mains switch off and then on again after a
few seconds. (See also temperature control above)
Temperature related faults will reset once the unit has cooled sufficiently.
Output short circuits will require manual reset after clearing the fault.
5.6 Bridged (green LED)
This indicates the position of the switch on the rear panel and is illuminated when
bridged mode is selected with the switch pressed in.

5.7 Temperature control

The cooling fans respond to temperature sensors within the unit to maintain a safe
operating temperature. In the event of excessive temperature, the protection circuit
will disable the output. The red Audio-Protect (A/P) LED will indicate this condition
(see fault indicator).
The B1500 has two fans connected permanently with variable speed.
The B2000 has one fan per channel and has a jumper link to enable them from cold.
Normal dynamic signals will not cause the amplifier to overheat unless the
ventilation is inadequate. (See installation section and maintenance section.)
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B2000

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