Someone noted that LO is variable with volume control (like HO). Is this true? [If so, this is an added layer of potential gunk added to the audio output]. If true, can the vol. be defeated? Has anyone compared HO to LO when used with external amp (or pre-amp).
How many CS4398 are in this unit (Teclast/SFlo uses two Wolfson DACs, which is good; those Wolfson DACs, BTW, are equiv. to the Cirrus CS4398 in the CK4)?
What's the LO / HO op-amp -- i.e., ADA4075? for both LO/HO? That's a 0.75 USD el cheapo op-amp. The QLS-350, e.g., has a much-nicer AD opamp for only ~ 1.0 USD more.
EDIT: may have found some answers to my queries above (after an image search)...
... so one DAC (too bad ... dual differential would add about 3dB to S/N! Still a nice chip.)
BTW ... glad Colorfly decided to clean up their mess ... LOL!!!
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Noted from main site http://colorfly.colorful.cn/product.html
that high-end C4 uses ...
·ADI AD823 chip
·CIRRUS LOGIC CS4398 DAC chip
·CIRRUS LOGIC CS8422 SRC chip
·TCXO high-precision crystal Oscillators
Haven't carefully ck'd the PCB image above to determine which of these made it to CK4. Obviously, the AD823 did not. If you're okay with a soldering gun ... that 823 is a nice-sounding OPA ;)
Notice the Cirrus CS8422 SRC chip? Methinks this is probably for upsampling (comes before CS4398). I don't see one on the CK4 PCB above ... poop! So SQ takes a bit of a hit. Also saw boutique parts (caps, etc.) for the C4 but not CK4. Still, I don't see the former unit being all that much better ... oh but that wood grain ... I'm Jonesin' ... think: American station wagon from the disco era ...
This flow chart from Colorful.s C4 page shows position of the SRC noted above. AKA: UPSAMPLING. Got woodie?