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Old 18th May 2011, 01:16 PM   #1
Tinto is offline Tinto  Georgia
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Unhappy One speaker off the both stereo channels possible?

Hello audiophile community

I have a board called VMA2015 class D amplifier which is actually two separate mono amplifiers.
I want to switch 2.1 speaker system in this. Actually tweeters is no problem just each goes to 1 amp.
BUT what should I do with subwoofer ???
How can I mix signal at output to direct it to only one speaker?
Is it possible just to attach it to + channels of these separate amplifiers?

I guess it's a very stupid question?
Anyway, thanks for support

Last edited by Tinto; 18th May 2011 at 01:24 PM.
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Old 21st May 2011, 04:33 PM   #2
gfiandy is offline gfiandy  United Kingdom
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To answer this question we need a bit more information I am going to rephrase it to see if I understand what you are asking.

You want to run:-

2xtweeters

and

1x subwoofer

From 2 x VMA2015

You want to mix the bass for the subwoofer so you can use both amplifers for the sub.

I do not belive this is possible.

If your tweeters have a crossover then you could run

1 tweeter on each amplifer

and

The subwoofer on one of the amplifers. Most low frequency in music tends to be mono so it will probably sound OK but not audiophile.

If you want all the bass from both channels to be directed to one of the amplifers for the subwoofer you will need to design a filtered summing circuit.

This is possible but not trivial and for the quality you are likely to achive probably not worth it.

Regards,
Andrew
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Old 21st May 2011, 08:31 PM   #3
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You could bridge the amplifiers.
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Old 21st May 2011, 08:53 PM   #4
gfiandy is offline gfiandy  United Kingdom
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This design of amplifer is already bridged. Also this would not drive the two tweeters.

Regards,
Andrew
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Old 22nd May 2011, 03:01 PM   #5
Tinto is offline Tinto  Georgia
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Yeah,

I guessed gfiandy is more then cright!
but my friend told me that he's seen something like that on the web....
and I followed the catch

Sorry for that and
thank you for support!!!
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