Looking for VERY simple A/B Speaker switch schematic - diyAudio
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Old 24th July 2008, 08:38 PM   #1
pitguy3 is offline pitguy3  United States
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Default Looking for VERY simple A/B Speaker switch schematic

First- Sorry for all the questions...

I have 1 input and 2 pairs of speakers that I want to switch ... This is for an outdoor application. Do I need to worrk about impedance matching? Can I just have a simple A/B Switch? When I wire it, can I straight wire all the negs and just switch the positives?

Thanks in advance!!
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Old 24th July 2008, 10:20 PM   #2
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'Do I need to worrk about impedance matching?' - only if you want both sets of speakers working at once
' Can I just have a simple A/B Switch?' - yes
' When I wire it, can I straight wire all the negs and just switch the positives?' - yes

use heavy duty switches and wire, be very careful that nothing will short out, or you'll blow the amp...
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 26th July 2008, 03:44 AM   #3
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Quote:
When I wire it, can I straight wire all the negs and just switch the positives?
Yes,You can...Assuming that the amplifier uses a 'common ground' scheme.
If it's class-D,or bridged,etc. you DO NOT want to connect all the negatives together,as they might all be at some/different potential.

Generally it's okay with the "usual" amplifier topology.
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Old 26th July 2008, 07:57 PM   #4
pitguy3 is offline pitguy3  United States
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Thanks DJ and Pete! The stereo that I am wanting to do this to is a Phillips model FW316C... It's a CHEAP stereo that I bought at a Thrift store ($17 believe it or not) to go outside... It states that it has a 3 ohm output impedance and the other set of speakers I have states that it ranges from 4-6 ohms... Not really wanting to run both sets at once, but it would be somewhat nice if I could...
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