Power switch for sub ( modify existing sub ) - AVS Forum | Home Theater Discussions And Reviews
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Old 02-20-2006, 02:48 PM - Thread Starter
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I purchased an Onkyo HT-S780... and in the manual it indicates a power off switch for the sub... ( but NOT the north American model )... Hmmm Why?

Anyway, I would like to have the power off feature... numerous times i wished i could just quick shut it off and NOT have to reach thru power cables ( errr ) to pull the plug.

My question. Do you think the missing power switch simply cuts the power to the sub -as if you pulled the plug? Or is there other circuitry involved? What about simply cutting off the SIGNAL? I am concerned simply cutting the signal will cause an unwanted "pop" or "crackle" -or damage the sub...

I don't want to have to power off the receiver first, before i power off the sub...

how would you modify the sub?

Any thoughts?

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Old 02-20-2006, 08:13 PM
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My question. Do you think the missing power switch simply cuts the power to the sub -as if you pulled the plug? Or is there other circuitry involved?
The power switch is usually the first thing the hot leg hits once the power cord is inside the component.

Basically, what you usually see is the power cord coming in and going straight to a transformer. The hot leg will be interrupted by a switch.

Since that isn’t happening with your sub, to figure out which of the two is the hot leg, notice that the outer insulation on two conductors of the power cable are not the same. One will have markings down it, or perhaps it will have a ribbed surface down its length. Once you’ve established which of the two conductors is marked, and how, go to the plug end and notice the blades, one is wider than the other. The narrow blade is the hot leg. You should be able to figure out from there which lead is the hot lead, and how it’s marked. Then find the same lead on inside the sub, cut the wire and install your switch across it (naturally, you want to make sure it’s unplugged from the wall). You can probably find a blank area on the connection panel to drill a hole for the switch. Get a switch that takes slide-on connectors that are crimped to the wire. You might have to lengthen the wire to reach to where the switch is.

Wayne A. Pflughaupt

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