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This is an uncharted but very interesting territory for me.
Just out of curiosity, how can one
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reduce the output level of the DAC?
I guess that one needs to be a DIYer or an engineer who knows how to open the ODAC and
to swap some resistors?
Obviously, in my case I am applying the second solution, namely using the O2's
unity (1x) gain and it works fabulously.
No, that's my bad. I worded that poorly and confusingly. I meant to limit the level output from the DAC, which is generally achieved by turning the volume down in software. In other words, if all sound information is scaled down prior to being sent to the DAC, you'll never reach 0 dBFS (DAC full-scale output), so the output is effectively limited to a smaller range that won't cause clipping later in the signal chain.
I mentioned resistor swapping for the O2, not the ODAC. You just need to replace two resistors with two others, by desoldering the ones in place and then soldering in the replacements.
Actually though, ODAC output level is configurable, so one could in theory do some resistor swaps for that as well. The ES9023 DAC chip includes the line driver, and publicly-available information (I think to get more info, you need to be a designer who's using the chip) seems to indicate that the output level can be set with an external resistor value. That said, changing surface-mount parts like the ODAC has is a whole lot more troublesome than through-hole components like the O2; documentation and calculations for everything are available for the O2, but not at all for the ODAC. They're much smaller so more difficult to manipulate physically by hand.
Now, some of the faceplate options with others' branding on them really do look amateurish. Actually, the writing style and grammar on the website don't exactly help either.
- The cost of having my own plates machined, milled and engraved is astronomical, and requires huge bulk orders. Currently, I have my own engraved acrylic front panels that come as stock with my units. I created that entire website, by myself, with the limited tools at hand, I am not a software engineer. Please point out any grammar imperfections on my website.
Yeah, doing faceplates would be expensive in any kind of smaller quantities. I didn't suggest that you're doing anything that doesn't make sense.
I'm also more of a technical guy with spotty grammar, but seeing as you asked, I'll try to find a few issues. I get the feeling like I'm probably making mistakes and putting a huge foot in my own mouth by doing so, but so be it.
Front page:
Whatever you are looking for in a hi-fi system; solid state amps to DAC's, we have it.
If you have a question, special request, or would like to get something personalized, head over to the contact page and shoot us a message.
Shouldn't that be a colon or maybe em dash instead of the semicolon? The slashes below are obviously intended and okay in that kind of writing. Apostrophe after an abbreviation like DAC is a style issue gray area, so that's okay. The second sentence has some bad parallelism, but this is also common in informal writing and speech.
Several pages mention the o2. NwAvGuy always abbreviates it as O2, so that's what I would use.
This design was made by nwavguy. It is the most clean and powerful headphone amp you can buy for under $300. If you google the amp or look in the DIY forum, you will find people raving about this headphone amp. It is really that good! I will be building each one by hand and testing them thoroughly. I use DD version op amps and all name brand components which are longer lasting and clean up the signal a bit.
>> no caps for nwavguy
>> no caps for google
>> what is "the DIY forum" and why are you talking about it? DIY forums in general?
>> name brand is a compound adjective, should be name-brand
>> most styles have a comma before the which, I would think
Again, it's mostly style and not actual mistakes. It's also mostly just my opinion.
