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Old 16th May 2006, 10:01 PM   #1
borges is offline borges  Norway
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Default 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,
Břrge
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Old 17th May 2006, 06:50 AM   #2
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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.
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Old 17th May 2006, 07:21 AM   #3
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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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Old 17th May 2006, 07:38 AM   #4
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I think there is difference between when the speaker gets damaged and when it only produces bad sound.
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