135MA & 160MA Have Priority Ducking, not Priority Muting
Written by Gary Brindley
Updated at January 14th, 2026
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135MA & 160MA have Priority Ducking, not Priority Muting.
The Priority Muting feature on the 135MA and 160MA mixer amps do not have enough of a volume change to use it to switch between two sources on these mixers.
The 135MA and 160MA manuals discuss this mixer-amp line's priority muting features, but the nomenclature appears to be incorrect.
In test, measuring the 70V speaker terminals with 1k Hz tone as a source, the MA mute changed the volume of the ducked inputs by only - 25d B, not -Inf as would be expected for priority muting.
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