I am pretty sure many of the poor reviews are due to people buying it without checking that their gear meets the wattage requirements - exactly what I have done! However the tests I've done haven't caused any noise whatsoever. Although I'll be returning mine to Amazon, it's only because my amp needs more than the 1 watt in standby and therefore won't trigger Off.Ouch! Not exactly glowing reviews for that one. Did you experience any "buzzing" noise from yours?
I have written to Energenie suggesting they modify the wattages requirements to something like less than 10 watts to turn Off and 15+ watts to turn On. My amp (and most preamps, etc) needs more than 15 watts when on, so it would satisfy most audio users.
I've also suggested they consider a block that has a built-in Trigger In so that it can be linked with a Trigger Out from an amp or preamp, and this would turn off 4 outlet sockets. Possibly a re-worked block based on this existing one, with the Trigger In socket replacing the undesirable switch.
ENER010 Energenie 4 Radio Controlled Surge Protected | eBay
3-Way surge protection across live, neutral and earth. Total max. spike current: 18,000A. During that process you will be issued with an RMA number. Product Details. Images shown are for demonstration purposes.
www.ebay.co.uk