Offset voltage

borges · 16th May 2006, 10:01 PM

What is the recomended minimum DC offset voltage into a loudspeaker element? Both into bass and into treble.

The reason I am asking is that I am building a DAC with digital X-over (more on the particulars later). I will also add volume control to this. I'd like to keep it DC coupled, and there is no guarantee that whatever power amp I connect is AC coupled.

Thanks,
Børge

peranders · 17th May 2006, 06:50 AM

Only the bass element is affected of the offset. All other elements has a cap in series.

I'll guess you'll never get an exact answer but according to me 100-200 mV is nothing to worry about even though I prefer lower than 50 mV.

This is very dependent of how big the bass element is and the power handling.

If the power amp also is DC connected and can amplify DC you must take care of the offset and an easy to eliminate the offset is to use a DC servo.

ifrythings · 17th May 2006, 07:21 AM

I've seen amps that trip the protection circuit at 800mV

so that designer thinks that's not too high. But I agree with peranders, 50mV or less should be good.

I know you want it DC coupled by why not use 1 cap in the input and it would solve a lot of your problems. It's not like our running several GHz through it.

(or are you?)

peranders · 17th May 2006, 07:38 AM

I think there is difference between when the speaker gets damaged and when it only produces bad sound.

16th May 2006, 10:01 PM	#1
borges diyAudio Member Join Date: Dec 2003 Location: Oslo, Norway	Offset voltage What is the recomended minimum DC offset voltage into a loudspeaker element? Both into bass and into treble. The reason I am asking is that I am building a DAC with digital X-over (more on the particulars later). I will also add volume control to this. I'd like to keep it DC coupled, and there is no guarantee that whatever power amp I connect is AC coupled. Thanks, Børge

17th May 2006, 06:50 AM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Only the bass element is affected of the offset. All other elements has a cap in series. I'll guess you'll never get an exact answer but according to me 100-200 mV is nothing to worry about even though I prefer lower than 50 mV. This is very dependent of how big the bass element is and the power handling. If the power amp also is DC connected and can amplify DC you must take care of the offset and an easy to eliminate the offset is to use a DC servo. __________________ /Per-Anders (my first name) or P-A as my friends call me

17th May 2006, 07:38 AM	#4
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	I think there is difference between when the speaker gets damaged and when it only produces bad sound. __________________ /Per-Anders (my first name) or P-A as my friends call me

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17th May 2006, 07:21 AM	#3
ifrythings diyAudio Member Join Date: Oct 2005	I've seen amps that trip the protection circuit at 800mV so that designer thinks that's not too high. But I agree with peranders, 50mV or less should be good. I know you want it DC coupled by why not use 1 cap in the input and it would solve a lot of your problems. It's not like our running several GHz through it. (or are you?)

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