Maybe paint it with the blackest paint in the world?If the disc tray is silver, like my old x-01, then covering with black self adhesive felt or vinyl will improve sound quality.
https://www.mjkzz.de/products/musou-black?variant=38002526191799Maybe paint it with the blackest paint in the world?
It's probably aluminium, so it might not stick, though.This is the world's blackest paint! Black 3.0 is the latest version of Stuart Semple’s super matte, ultra black acrylic paint. It was created with the help of over 1000 different artists who beta-tested the paint. Black 3.0 is the blackest and mattest acrylic paint on the planet.culturehustle.com
You're right, but it might flake off when CD is being put on it:
Right, the tape is much easier to be cleaned up. It's really down to how hard you want to go on your CD player. Still, painting CD tray is not as intrusive as replacing an opampBut not easily reversible
Yes, you are right, an endless and super interesting field. A bit like cooking for different tastes. But we can agree that the NE5534 is best to be exchanged, and that it can be easily done. So I personally dont fear warranty problems and never had one.OPA627 is an excellent FET input device, thus it has a very low input current. How are you seeing it as a benefit in this application? Is the DAC output or feedback resistors high impedance?
The biggest pro of discrete opamps is a two-pole compensation, which is impossible to do in an IC. Two-pole compensation allows the opamp to have much more feedback at high frequencies (say 10k+), offering better distortion reduction. Sparkos has an excellent blog post about it, I believe, you'll love it: https://sparkoslabs.com/discrete-op-amps/audio-op-amps-gain-seek-bandwidth/
He makes excellent opamps too.
As for sockets, you are absolutely right. They add inductance and physical distance to the decoupling capacitors. It has the biggest effect on power supplies. Most discrete opamps have their own decoupling on board, so it's not that big of an issue.
I'm very curious to hear from you about that. It's a very interesting discussion!
NE5534 is a great part, but its contemporary counterparts are way better.Yes, you are right, an endless and super interesting field. A bit like cooking for different tastes. But we can agree that the NE5534 is best to be exchanged, and that it can be easily done. So I personally dont fear warranty problems and never had one.
And you are right also with the importance of the capacitors for the OP amp supply. Thank you for your feedback!
I'm not from RnD, I just know a thing or two about electronics I believe that you can use a bipolar input opamp in this place without the fear of disrupting the filters (which is what Esoteric did). We can do simple guesswork about the filter. This is a low-noise circuit, which implies the filter must have a low impedance to avoid Johnson (thermal) noise.Hi! Fine to meet someone who is also heavily engaged in audiophile parts. Obviously you know more about available OPamps than me.
Are you a part of the R&D team of ifi audio?
Yes,, I order from Mouser, parts come direct from Texas. OPA627 has laser trimmed input resistors for the ultra low Ib.
This is important in filter design for minimal load of the 12 dB RC filters Esoteric is using. The OPA 627 is selected in specs and the BP grade is better than the AP grade.
The most important thing is that you are sharing your experience with the community Modding is often a good way to improve specific devices if you are okay with losing your warranty. That's always a tradeoff. Alternatively, some folks wait until the end of the warranty period, before moding.Hello AMR / iFi audio,
It is a two stage 12 dB Filter with 1.8kOhm and 470 pF followed by 5.6kOhm with 100 pF, Feedback resistor is 2,4kOhm, so the gain is a little over 1, perfect for OPA627.
Im sorry, Im not engaged in physical theory of OP amps and dont know much about it. So I depend on what I can hear, and for my personal individual taste the OPA627 is the best I ever had in filter stages.
And maybe Im adapted too much to this sound that I know so good, that Im spoiled for testing further OPamps.
My point was for the K-03XD owners to think about replacing the NE5534. And for the OPA627 I know it is worth to be done.
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