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Multi-Way Conventional loudspeakers with crossovers

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Old 18th August 2014, 01:49 AM   #1
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Default Single Point Stereo Speakers

Could someone tell me if these are a good idea? Each "Channel" has a separate 6 db crossover and separate tweets but the main cone has a dual voice coil. With different (L&R) inputs going to the same cone, is it possible for them to null each other out at some point?

Just curious..
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Old 18th August 2014, 02:56 AM   #2
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Does those magic speakers have any brand and model on them?
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Old 18th August 2014, 09:53 AM   #3
graaf is offline graaf  Poland
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Quote:
Originally Posted by OffGridKindaGuy View Post
Could someone tell me if these are a good idea? Each "Channel" has a separate 6 db crossover and separate tweets but the main cone has a dual voice coil. With different (L&R) inputs going to the same cone, is it possible for them to null each other out at some point?

Just curious..
yes, it's possible, some recordings, a minority but still, would be incompatible
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Old 18th August 2014, 10:15 AM   #4
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Never heard these but allegedly they work fine for stereo in a near-field application:
EMES Studio Monitor Systems


(click on OWL System or miniOWL)
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Old 18th August 2014, 10:34 AM   #5
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Does those magic speakers have any brand and model on them?
Read my review. "Project Idea"..

MCM Custom Audio 6 1/2'' Single Point Stereo Ceiling Speaker - 50W RMS | 50-14020 (5014020) | MCM Custom Audio

I don't see much difference between these and the higher priced ones beyond the tweets. Good enough for playing around and they do sound pretty good..
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Old 18th August 2014, 12:49 PM   #6
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Of course this does not produce stereo.

Something to be aware of is that feeding a dual voice coil driver with two different signals will lead to the peculiar result that because of back EMF, the feedback in your power amp will attempt to iron out differences between the two signals. Definitively not a good idea.
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Old 18th August 2014, 10:45 PM   #7
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Not really "True" stereo but the tweets are totally independent of each other via the two crossovers. The low/mids are put into the cone applied to two separate voice coils. There is no D.C. connection between the L/R voice coils but they are both on the same coil form. (Like a dual coil subwoofer)

Each channel is rated at 8 ohms. I'd imagine that both "Channels" could be connected in parallel, which in theory, would become a single 4 ohm speaker with 2 voice coils and two tweets. (Possibly increasing the sensitivity somewhat)

Thoughts? Comments?
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Old 18th August 2014, 11:27 PM   #8
rayma is offline rayma  United States
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Quote:
Originally Posted by OffGridKindaGuy View Post
Could someone tell me if these are a good idea? Each "Channel" has a separate 6 db crossover and separate tweets but the main cone has a dual voice coil. With different (L&R) inputs going to the same cone, is it possible for them to null each other out at some point?

Just curious..
This is essentially a mono woofer. The L+R (mono information) adds, and the L-R (stereo information) cancels.
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Old 19th August 2014, 12:49 AM   #9
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What do you believe would happen if both (L&R) sides of the single stereo speaker were paralleled and a single channel input (L or R) was put to the unit? (Not expecting to use it as a "Stereo" unit any longer) It would become a single channel speaker with dual voice coils, dual crossovers, and two tweeters @ 4 ohms of impedance. Two "Paralleled" speaker units would be needed for stereo. One for the left channel and one for the right..

I have 2 of them and may try it, just to see what happens..
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Old 19th August 2014, 01:32 AM   #10
rayma is offline rayma  United States
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Originally Posted by OffGridKindaGuy View Post
What do you believe would happen if both (L&R) sides of the single stereo speaker were paralleled and a single channel input (L or R) was put to the unit? (Not expecting to use it as a "Stereo" unit any longer) It would become a single channel speaker with dual voice coils, dual crossovers, and two tweeters @ 4 ohms of impedance. Two "Paralleled" speaker units would be needed for stereo. One for the left channel and one for the right..
That should be regular stereo. The woofer would then be half the impedance, and draw twice as much current from the amp.
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