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Old 12th January 2015, 09:07 AM   #1
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Question Combining -ve lead for speakers?

Would there be any problems associated with combining the -ve signal leads from two pair of speakers (not joining left and right) - i.e.
Amp Left -ve to Left speaker 1 and Left speaker 2
and
Amp Right -ve to Right speaker 1 and Right speaker 2
The +ve leads would be routed through a double gang two way light switch.

This is a temporary measure to allow quick and dirty comparison between two pairs of speakers - IT IS NOT INTENDED AS A PERMANENT SETUP.
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Old 12th January 2015, 09:30 AM   #2
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Yes no problem at all.
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Old 12th January 2015, 11:19 AM   #3
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As long as your amplifiers are not working in bridge mode and the -ve lines are the same at the source.
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Old 12th January 2015, 12:13 PM   #4
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I read it as only one amp is used, he's just switching speakers.
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Old 12th January 2015, 10:02 PM   #5
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Quote:
Originally Posted by richie00boy View Post
I read it as only one amp is used, he's just switching speakers.
Correct, a single bog-standard Quad 303 driving one of two pairs of speakers as selected by a double gang two way light switch switching the +ve signal leads.

Both pairs of "left" -ve leads will be combined and both pairs of "right" -ve leads will be combined.
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Old 13th January 2015, 12:59 AM   #6
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Then he would require a DPDT switch. Alco Switch have some nice ones. Have a few here that are center off latching type. Pull out to change position.
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Old 13th January 2015, 07:00 AM   #7
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He is using a DPDT switch...
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Old 13th January 2015, 08:00 AM   #8
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Actually, strictly speaking I am using a pair of single pole double throw (SPDT) switches - i.e. where I am evaluating Speaker Pair A and Speaker Pair B, I could set the switches such that I am listening to Speaker Pair A Left and Speaker Pair B Right.

With a DPDT switch I would have to listen to Left & Right Speakers A -or- Left & Right Speakers B.

SPDTSPDT.jpg - DPDTDPDT.jpg
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Old 26th January 2015, 12:37 PM   #9
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Well, I made up the crude DIY speaker switch as described in the opening post and it works absolutely fine

DIY spkr switch.jpg
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Old 26th January 2015, 02:25 PM   #10
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I cannot think of a valid reason you need to listen to Speaker Pair A Left and Speaker Pair B Right, except maybe for comparing absolute SPL.
Anyway, the problem I see in using a switch like yours is the contact resistance, it can be some ohms, not a problem in the intended application, but a problem when driving a speaker, as the effect is not constant with frequency.

Ralf
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