Bose B1500 Owner's Manual - Page 12

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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.

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.

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.)