CH M10 - Audio Settings Menu

3.5.1 Audio settings menu
Amplier mode
Allows users to select between the different operating modes (stereo, active/passive bi-amp, monaural or
bridged). With a single M10, you can only use the amplier in stereo mode. However, with a pair of M10s
there is a range of possible options, generally dictated by the matching speakers.
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If your speakers are bi-wirable then you have the option to run them bi-amped. The passive bi-amp
mode allows you use a single input but to adjust gain and feedback independently for each channel
of the amplier/section of the crossover.
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If your speakers use an active crossover between the pre-amp and M10 ampliers, you will need to use
both inputs while still being able to control the individual channel parameters.
–
If your speakers are low impedance or present a reactive load, then monaural conguration will deliver
the best results.
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If your speakers are low sensitivity and/or high impedance, then bridged mode will be optimum.
Global feedback
Users can select the percentage global feedback (GFB) applied to the output stage. In the M10 the feedback
ratio can be adjusted from 0% global (100% local) to 100% global (0% local), in 1% increments.
Generally speaking, low levels of global feedback deliver the most musically expressive results, while
increasing GFB increases control and precision, especially at low frequencies. There is always a balance to be
struck between these qualities and in every system, that balance will occur at a different point.
Start with the GFB set to 0%. If you feel that the bass would benet from some extra grip, simply increase
the global feedback until you’re satised with the overall presentation. Do not add more global feedback than
strictly necessary, as ultimately it will decrease those qualities that make the midrange and treble sound so
uid and natural.
With a bi-amped or active setup, we recommend keeping the feedback setting for the mid/treble at 0%,
while applying subtle adjustments in %-level to the low frequencies. You can experiment with these settings
to arrive at the optimum value but note that: you may well reduce %GFB over time and that your preferred
value may actually vary with the musical program.
Gain
The M10’s overall gain is +24dB, with bridged mode adding an extra +6dB. The gain of each amplication
channel can be tuned by up to 6dB, in 0.5dB increments. This allows several things:
In a stereo setup, the nominal gain of the amplier can be modied to make the preamplier work in its
optimal range while keeping the same total system gain.
When used in conjunction with another amplier model (or a separate sub-bass system), the M10’s gain can
be adjusted, ensuring consistency across the system.
When using multiple M10s in a bi-amp conguration, setting independent gain for the different legs in the
loudspeaker crossover allows relative bass to midrange/treble level adjustment, which can be a vital aid to
speaker positioning and set-up.
M10 User Manual 19