Which DACs are known to be sweet/rich/relaxed?

@robert1976 My apologies for missing that key post. Obviously my skimming skills are lacking. Glad that you found a solution. Enjoy!

@robert1976 After skimming through all the responses thus far I reread your original post. Seems you are happy with the sound quality of your current componentry on the majority of musical content, excepting poorly recorded/mastered rock (ie RHCP). Is that still the issue at hand?.

If so, my take is that you have excellent components (including the Tambaqui) and competent analog cabling/power cords. Most if not all changes you could make will improve some things but will involve tradeoffs in other aspects of sound character that may not be to your preference. This is tricky and gets expensive fast, especially as changing a key component such as a DAC can send you into the spiral of major cabling and even component changes to accommodate.

Although I suspect that there is no truly effective remedy for poor sound quality of a recording, you may be able to improve its tolerability without making major changes. I suggest that you contact The Cable Company or another authorized Synergistic Research dealer and request a risk free trial of a Synergistic Research Galileo SX Ethernet cable. This is my preferred Ethernet cable after testing several, but that is not my point. The unique thing about the SR products is that they provide two “tuning bullets” that are easily swapped out (unplug and replug).to change the sound character from a detailed, high resolution sound (the silver bullet) to a warmer, more forgiving sound (the gold bullet). I use this feature often to adjust for program material sound quality variances or even to compensate for varying AC quality at different times of the day. The gold bullet may well make the RHCP and other poor rock recordings (more) tolerable to you while allowing you to easily swap to the silver bullet for other listening if you prefer. It not, just return the loaner cable.