General Question

jackm's avatar

What is the speaker driving voltage of an amplifier?

Asked by jackm (6205points) January 22nd, 2010

I have an old Pioneer Stereo Receiver (model sx450) driving the speakers for my record player.

I want to hook up some christmas lights to one of the speaker outputs on the back. What voltage do these typically put out? Also, what voltage would be required to light up the christmas lights?

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5 Answers

Tropical_Willie's avatar

I have to ask WHY?

That said, Speakers and a light bulb are two different types of load, and the the lights will probably fry the output transistor.

jackm's avatar

I want to have a few lights pulse with the music.

The load isn’t that different, i just need to make sure the resistance is about the same.

Tropical_Willie's avatar

The lights will act as dead short to the transistor and fry it. What you need is a separate trigger and power source. I know because I use to be in a band with a light show and it was attached to the speaker output with a circuit that would light up the bulbs.

The load is called impedance for speaker and resistance for a bulb. I’m not an engineer but know that you should never have a impedance lower than the amp transistors are rated for.

NadaNormal's avatar

go to the local hobby shop, radio shack etc and look for a “light organ” kit – this is what you need to drive the lights without destroying your amp
Putting the lights directly across the speaker outputs will give a impressive show of smoke and sparks

jackm's avatar

I was researching this and I found this video. He uses no special equipment.

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