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TS5A23159: Switching audio and video

Part Number: TS5A23159

:  I am trying to switch 8 ohm speakers. When switched off there still is a scratchy sound coming though from the amplifier. The speakers are not completely switched off. I have tried a dummy load on the NC side of the switch but made no difference. Is there an application note pertaining to audio speaker switching or can you please send me some info regarding speaker switching.

Also will this be a problem when switching video from eg car cameras.

Thank you
Regards
Martyn