# One set of speakers with two sources

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#### Art M

Jan 1, 1970
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Sorry if this question is too basic. I have my computer connected to a set
of speakers (amplified sub-woofer with satellites), and I have a piano
keyboard. I connected all three using a y-splitter (1/8" jacks?). The
problem is that half the volume of the signal is apparently lost down the
inactive source.

Can I make or buy a simple switch for the two sources? A guy at Radio Shack
came up with a solution that involved some box and about six adaptors that
totaled to about $40. I can continue to play old fashioned telephone operator for that price. Or perhaps there's some sort of diode-like devices I can use with the splitter/joiner? Thanks, --Art B #### Bob Masta Jan 1, 1970 0 Sorry if this question is too basic. I have my computer connected to a set of speakers (amplified sub-woofer with satellites), and I have a piano keyboard. I connected all three using a y-splitter (1/8" jacks?). The problem is that half the volume of the signal is apparently lost down the inactive source. Can I make or buy a simple switch for the two sources? A guy at Radio Shack came up with a solution that involved some box and about six adaptors that totaled to about$40. I can continue to play old fashioned telephone
operator for that price.

Or perhaps there's some sort of diode-like devices I can use with the
splitter/joiner?

Thanks,
--Art

The general rule of thumb is that you can use 'Y'
splitters to connect one output to two or more inputs,
but you should never connect two outputs together
directly.

Anything with diodes will trash your sound, so that's
out. But since your speakers are amplified, you can
probably get away with a simple passive mixer.
It's really just a refinement of the 'Y' connector,
except that you need to put a resistor in series
with each arm that comes from an output. You
technically need a third resistor *across* the
input to the amp (from center to ground) but
most amps have one built in. I'd start off
with about 10K ohms in each output arm.

You will still lose half the volume, but now it's
due to the passive resistors. Just boost your
amp volume to compensate.

Hope this helps!

Bob Masta

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com

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#### Art M

Jan 1, 1970
0
Thanks for the help Bob.

--Art

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ross franks
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