BM6A 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 control
works from 3kHz upwards and has a range of 5dB (see figure 1).
LF Trim. This control allows the low frequency level to be adjusted. The control works
from 100Hz downwards and has a range of 5dB (see figure 1). This section
uses a special equaliser design which effectively swaps bandwidth for power.
As you turn the LF trim level down the low frequency extension is improved.
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.
Figure 1 - Trim Control Response
Indicators
There are two LED indicators on the front baffle of the BM6A.
The right hand one is the power/fault indicator. On switching the unit on this will shine red for
about ten 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.
The left indicator is a true clip indicator and lights when the low frequency amplifier clips. It is
acceptable to run the system with this lighting occasionally but avoid running the system with
this lighting most of the time
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Frequency Response
