hello alltogehter, i am still dedicated to squeeze the maximum sound quality out of my sb classic.
- replacing the switched 5v power supply with a nice home-built 5v linear regulated one (incl. mains filter + enough storage capacity in a closed aluminum case) really improved the low level playback performance of the sb. especially residual noises at 400Hz test-tone levels from -60dB downwards are gone! - what is still missing from my perspective, is some kind of volume adaptation of the quite high output level of the sb connected to my naim nait5i amp. the amp will reach clipping already before the 12 o´clock position of the volume control! listening at lower levels drives the potentiometer´s stereo balance already in unfavorable regions, where the differences between left and right attenuation are quite high. - so, mentally excluding some resistor voltage dividers outside the box (because of various dimensioning problems) and of course excluding the built-in software attenuation, i came to the conclusion, to modify the post-dac filter-circuit (this op-amp based butterworth filter) for less amplification (maybe some 8-10dB), but no change in roll-off behaviour! therefore i would need the dimensioning of that built-in filter circuitry! yes, i checked already the burr-brown/ti recommendations and some other threads, especially the ones where a link was mentioned, with some circuitry drawings of the sb´s output section (i think from sean adams), but nothing solid is available any more. - is there anybody out there, to give some good advice on the filter design/assembly of the sb classic!? thanks in advance and br duesentrieb -- duesentrieb ------------------------------------------------------------------------ duesentrieb's Profile: http://forums.slimdevices.com/member.php?userid=22181 View this thread: http://forums.slimdevices.com/showthread.php?t=57927
_______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
