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Old 13th May 2008, 10:17 PM   #1
vizion is offline vizion  United States
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Default Oppo DV-981HD output impedance

hi,

does anyone know the stereo output impedance of the Oppo DV-981HD ?

thanks.
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Old 13th May 2008, 10:34 PM   #2
rossl is offline rossl  United States
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I looked at the circuit a long time ago. If I remember correctly, there is an op-amp per channel, each channel has a coupling cap, a resistor and a mute transistor. The resistor makes the output impedance rather high, but it limits current when the muting transistor is switched in.

I don't use the analog outs of my Oppo 981, so I have not ever experimented with trying to make it sound better. But it would probably make the output impedance much lower if you removed the mute transistors and shorted the current limit resistor.

It might sound better, but I won't guarantee anything
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Old 14th May 2008, 02:02 AM   #3
vizion is offline vizion  United States
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is it 100 ohms or 1 kohm ?
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Old 14th May 2008, 09:12 AM   #4
rossl is offline rossl  United States
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probably over 1k ohms. I don't think anybody here has seen an official schematic. If someone has, I would like a copy of it
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Old 23rd May 2008, 11:23 AM   #5
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output voltage is 2.3v if this is what you were referring to
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