Cam, AV equipment is relatively low power(e.g. stuff like hair dryers and hotplates is far more demanding), so no, special circuits for that aren't necessary. The power supply sections in AV equipment are built to handle most power surges routinely and special protectors are of limited use(none in my case)for a surge which would be too strong for the equipment yet not so strong(e.g. a near direct lightning strike)as to defeat the protector. Judging from your various posts you may be unnecessarily concerned over power supply factors.

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Enjoy the music, not the equipment.