When using the Wall Plate (SO-MIX-PLATE) with the Remote Mixer (SO-MIX-T-24V) you must remove the plastic ring around the SO-MIX-T-24V. The input unit is attached by 2 magnets and can be easily removed. See image below.

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Contact Dr. Sound techtips@drsound.ca or our Technical Support Team for more information or with questions. 1-800-263-7639 x 320 technicalsupport@toacanada.com