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BM15A Owner’s Manual - Issue 2 Page 3
November 1997
Operation
Controls
Level switch. This sets the input sensitivity of the unit. The +4 position is intended for
professional use and means that full power is reached with an input level of
+4dBm (balanced). The -10 position is intended for semi-professional or
domestic use and means that full power is reached with an input level of
-10dBm (unbalanced).
HF Trim This control allows the high frequency level to be adjusted. The HF Trim
circuit is a low-Q equaliser which reaches a maximum range of 6dB @ 15kHz
(see graph).
LF Trim. This control allows the low frequency level to be adjusted. The LF Trim circuit
is a low-Q equaliser which reaches a maximum range of 6dB @ 50Hz (see
graph).
The trim controls are intended to allow the user to make some adjustment of the speaker
response to accommodate personal tastes and variations in acoustic environment.
Trim Control Response
Indicators
There are two LED indicators on the front baffle of the BM15A.
The right hand one is the power/fault indicator. On switching the unit on this will shine red for
about five seconds and then turn green to indicate normal operation. If for any reason the
amplifier protection circuitry is engaged the LED will turn back to red.