One speaker off the both stereo channels possible?

Tinto · 01:24 PM

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

gfiandy · 21st May 2011, 04:33 PM

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

nigelwright7557 · 21st May 2011, 08:31 PM

You could bridge the amplifiers.

gfiandy · 21st May 2011, 08:53 PM

This design of amplifer is already bridged. Also this would not drive the two tweeters.

Regards,
Andrew

Tinto · 22nd May 2011, 03:01 PM

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!!!

18th May 2011, 01:16 PM	#1
Tinto diyAudio Member Join Date: May 2011	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.

21st May 2011, 08:31 PM	#3
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	You could bridge the amplifiers. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

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21st May 2011, 04:33 PM	#2
gfiandy Audio Engineer diyAudio Member Join Date: Jul 2003 Location: Cambridge UK	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

21st May 2011, 08:53 PM	#4
gfiandy Audio Engineer diyAudio Member Join Date: Jul 2003 Location: Cambridge UK	This design of amplifer is already bridged. Also this would not drive the two tweeters. Regards, Andrew

22nd May 2011, 03:01 PM	#5
Tinto diyAudio Member Join Date: May 2011	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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