Quote:
Originally Posted by germanium /img/forum/go_quote.gif
You missread me. The D.C. off set coming from the input of the following amp is of no consequence as its current is very very low & is protected by at least 1Kohm of resistance at the input of the following amp. The opamp on the card can easily handle this amount of current & is therefore no threat at all to the card. I have been doing this mod for years & have yet to have a single problem as a result of it.
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Focus on the technical stuff here.
When we worry about the DC offset of a source(in this case it is STX), it is common sense that the DC offset is at the output(In this case, it is RCA output jack) of the source(STX).
For your case, less than 2 millivolts DC offset at RCA output of STX. But you can not guaranty all the rest STXs around the world MUST have such low DC offset. ASUS Hardware developers are not nuts, these two caps there have their meaning to the circuit, although they also introduce the problems such as phase shift, decrease in sonic clarity etc.
The problem caused by the DC offset is not against STX card itself. A lot headphone amps are DC coupled without input caps. If my STX RCA output has 5mv DC offset, and I use DC coupled headphone amp with gain 11, personally I won't be comfortable to let my HD650 to deal with about 55mv DC offset at the headphone amp's output jacks.
If we remove these two caps from the STX board then short the pads, we avoid cap related issues in audio path,then no phase shift, no decrease in sonic clarity etc. But we have to keep in mind that we risk damaging our expensive headphones if we do this. STX that has a low DC offset now may develop a problem tomorrow.