Creating a Sub Signal out

jtjy · 27th June 2011, 01:13 PM

Have a class D amp. How do i go about creating a sub signal out to my active subwoofer? Something like Nuforce amp with a sub signal out. Am using a tk2050 hifimediy

Centvrion · 27th June 2011, 03:08 PM

I can only direct you on the right way...then you have to ask somebody else because I have no time in these weeks..

Rough solution: connect L and R channels to the inverting pin of a high quality opamp, configured as buffer, then the opamp output to the amp. Virtual earth allows mixing channels without messing source signal.

jtjy · 27th June 2011, 03:38 PM

Quote:

Originally Posted by Centvrion

I can only direct you on the right way...then you have to ask somebody else because I have no time in these weeks..

Rough solution: connect L and R channels to the inverting pin of a high quality opamp, configured as buffer, then the opamp output to the amp. Virtual earth allows mixing channels without messing source signal.

what if i have a b1 buffer already?

Centvrion · 27th June 2011, 06:25 PM

sorry but I made a mistake.
You have to put a high value (eg 50k) resistor before inverting terminal, one each channel....then u have to set a resistor on the feedback or it can goes in buffer configuration.

About B1...don't know, but it would be better a new device for this application.

hope someone else can help you, but this is the way, try googling.

dublin78 · 28th June 2011, 08:08 AM

You can create a "line level" output after the power amp. I have a simple schematic somewhere.

Audio magus used to make a SUBLINE accessory to do this for t amps. Google it.

pinkmouse · 28th June 2011, 08:17 AM

Here you go. You need Circuit 2 with just two inputs and one output.

jtjy · 28th June 2011, 12:22 PM

Quote:

Originally Posted by dublin78

You can create a "line level" output after the power amp. I have a simple schematic somewhere.

Audio magus used to make a SUBLINE accessory to do this for t amps. Google it.

do u still have it? audiomagus is not producing any of those anymore.

dublin78 · 28th June 2011, 01:52 PM

Like the Audio Magus product, you simply connect this circuit to the loudspeaker terminals.

jtjy · 28th June 2011, 02:16 PM

Quote:

Originally Posted by dublin78

Like the Audio Magus product, you simply connect this circuit to the loudspeaker terminals.

alright thanks. so i have to make 2 of this to achieve a R and L line level output correct.

dublin78 · 28th June 2011, 02:38 PM

Yes.

You wont need long interconnects though!

27th June 2011, 01:13 PM	#1
jtjy diyAudio Member Join Date: Jan 2010	Creating a Sub Signal out Have a class D amp. How do i go about creating a sub signal out to my active subwoofer? Something like Nuforce amp with a sub signal out. Am using a tk2050 hifimediy

28th June 2011, 08:08 AM	#5
dublin78 diyAudio Member Join Date: Mar 2006 Location: Cheshire	You can create a "line level" output after the power amp. I have a simple schematic somewhere. Audio magus used to make a SUBLINE accessory to do this for t amps. Google it. __________________ Regards. Michael

28th June 2011, 08:17 AM	#6
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Here you go. You need Circuit 2 with just two inputs and one output. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

28th June 2011, 01:52 PM	#8
dublin78 diyAudio Member Join Date: Mar 2006 Location: Cheshire	Like the Audio Magus product, you simply connect this circuit to the loudspeaker terminals. __________________ Regards. Michael

28th June 2011, 02:38 PM	#10
dublin78 diyAudio Member Join Date: Mar 2006 Location: Cheshire	Yes. You wont need long interconnects though! __________________ Regards. Michael


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27th June 2011, 03:08 PM	#2
Centvrion diyAudio Member Join Date: Jan 2011 Location: Province of Bergamo	I can only direct you on the right way...then you have to ask somebody else because I have no time in these weeks.. Rough solution: connect L and R channels to the inverting pin of a high quality opamp, configured as buffer, then the opamp output to the amp. Virtual earth allows mixing channels without messing source signal.

27th June 2011, 06:25 PM	#4
Centvrion diyAudio Member Join Date: Jan 2011 Location: Province of Bergamo	sorry but I made a mistake. You have to put a high value (eg 50k) resistor before inverting terminal, one each channel....then u have to set a resistor on the feedback or it can goes in buffer configuration. About B1...don't know, but it would be better a new device for this application. hope someone else can help you, but this is the way, try googling.

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