Join Date: Feb 2010
Location: Chicagoland area
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I added the Pioneer SW-8 subwoofer to my BS21 speakers, for use in a small home office/workshop. This is for music only and given the small room size, I did not feel the need for a large sub. I am still playing around with the various settings on the SW-8, and trying out different locations in the room to get things dialed in.
One thing I noticed, even when the SW-8 power switch is turned off, there is a mild hum from inside. I connected it to my Kill A Watt device, which shows the sub is using 7.4 watts of power. Based on my calculation, leaving this sub plugged in (but turned off all year) would cost me $9.53.
Here is how I calculated. Any math gurus out there feel free to make correction if I did something wrong:
(Watts/1000 * Kwh Cost * Hours In Use)
.0074 * .147 * 8760 = 9.529128
Changing the power switch on the sub from Off to Auto doesn't seem to make a difference, the sub still consumes 7.4 watts of power. I could see how the auto-sensing setting might use some power, but not understanding why Off is not off. When you turn an appliance off, shouldn't it use no power?