Further Details on the Anti-Feedback Function
The CPM-300's Anti-Feedback function works by applying narrow-band "filters," called "Anti-Feedback Filters," to
the frequencies at which feedback is generated, thus eliminating the feedback by reducing the volume of those fre-
quencies. The CPM-300's Anti-Feedback function features eight separate filters.
With the "Auto Adjust Function," the volume is gradually raised, the intention being to actually cause feedback. It
detects the frequencies where feedback occurs, and after the Anti-Feedback Filter settings are finished, the gain is
returned to the original level. When the Auto Adjust procedure is finished, margin of gain (called the "safety mar-
gin") is maintained, so it keeps working even if conditions change. Six Anti-Feedback Filters are assigned in the
Auto Adjust Function.
The "Dynamic Adjust Function," which operates continuously whenever the Anti-Feedback ON/OFF switch is set
to ON (except when Auto Adjust is in progress). It monitors the sound for feedback during performances, and elim-
inates any feedback that may suddenly occur. Two Anti-Feedback Filters are used with the Dynamic Adjust func-
tion.
The bandwidth of these eight Anti-Feedback Filters is extremely narrow, so they can suppress feedback while hav-
ing very little effect on the sound quality.
At the completion of Auto Adjust, a "safety margin" of approximately 12 dB will have been set up. However, during
the Auto Adjust procedure, the Auto indicator will begin to flash rapidly as soon as a safety margin of 6 dB has
been achieved. This conveniently allows you to stop Auto Adjust while it is in progress, if you believe that a 6 dB
margin is sufficient for your needs.
*Auto Adjust ends when all six Anti-Feedback filters are set, even if the approximately 12 dB for the safety margin
is not attained.
How the Removal of Feedback is Achieved
About the Safety Margin
16
Summary of Contents for CPM-300
Page 2: ...2...
Page 3: ...AC100V P 9 3...
Page 4: ...2 3 6 4...
Page 9: ...1 POWER ON OFF 2 2 4 8 8 4 6 8 3 4 6 6 3 4 4 2 PC CPM 300 4 PC 4 CPM 300 PC 1 2 9...
Page 16: ...CPM 300 CPM 300 8 6 ON OFF ON 2 12dB 6dB AUTO SET 6dB 6 12dB 16...
Page 17: ...CPM 300 CPM 300 1 100 2 DC DC DC 3 ON 17...
Page 23: ...23 360 11 131 25 64 307 4...
Page 24: ...24...
Page 49: ...23 Dimensions 14 13 16 7 16 5 3 16 1 2 9 16 12 1 8 3 16...
Page 50: ...24 Blank User Settings Chart Copy this then use it to jot down your settings...
