no soix...
the dacs have worn out resistors, and the owners have worn out ears!!!!! HAAHAHAHAHAHA
the dacs have worn out resistors, and the owners have worn out ears!!!!! HAAHAHAHAHAHA
Downside to R2R Ladder DACs?
A sales person I generally trust told me to steer clear of used R2R DACs, since their reliance on high precision resistors causes them to sound best when new, and degrade fairly quickly. It seems reasonable; have others had any experience with this?
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- 33 posts total
Laser trimmed resistors on the same substrate tend to have similar tempco and aging. While aging can change initial resistance it is very likely to do it in similar fashion (same material) to all resistors keeping division ratios pretty much the same. In addition, the largest changes in any resistor are just right after production. Older resistors change very little. There is an assumption that non Delta-Sigma DACs are R2R - not necessarily so and many of them have self calibration mechanism. Mentioned Philips TDA1541 is R2R but only for the 10 highest bits while lower 6 bits are controlled by Dynamic Element Matching (DEM), based on emitter scaling 10-bit current divider. It is possible to have resistor ladder, current scaling, voltage scaling and charge (on capacitor ladder) based DACs plus combination of them in multi-bit converter. Even if we forget technical reasoning - IMHO only insane company would design a chip that shows sound deterioration after 10, or even 20 years. |
I don't know much about R2R Dacs of 10 years ago,but when I see the inside of a Denafrips R2R Dac with over 400 capacitors I wonder more about the sound impact of any number of those caps going bad over time, and by time, I mean the general time most "audiphiles" get the urge to change caps in their respective equipment. |
I don’t know much about R2R Dacs of 10 years ago,but when I see the inside of a Denafrips R2R Dac with over 400 capacitors I wonder more about the sound impact of any number of those caps going bad over timeIt’s very good for power supplies, as many small cap have far lower ESR (google it) than one or two big caps of the same uF. The energy release for transients is far quicker with lower ESR. The same now is happening for power supplies in poweramps of the higher end ones. Look at these in my 2 x amps, if you look close there are 2 cap stacks per channel https://ibb.co/cQXGW1F https://ibb.co/2WbJc5k https://ibb.co/h9b4T0X Cheers George |
- 33 posts total