antcollinet
Master Contributor
Bloody hell. Trying to impact the sound of a DAC by putting impedance into the power supply would be a ludicrously uncontrolled way of impacting the frequency response - or any other measure.A very unstiff power supply regulation for an OP-amp : slightly higher distortion at full music levels, current clipping in extreme cases, possible lower power voltage driving the OP and for sure some minor compression sound effects . In the original Linn akurate DS the output OP amps lm4562 only have 9 volts because of this - read more here:
Gerts Mod für den Linn Akurate DS (G-ADS) - aktives-hoeren.de
www.aktives-hoeren.de
Even if it makes a difference (which, given the high impedance most op amp circuits are driving I'd be very doubtful - it would only have significant effect if the psu voltage into the op amp dropped to the level the opamp was supposed to output - and then would hard clip) it would very from part to part just because of component tolerances. If you want to impact the sound, put a frequency dependent circuit in line (ie an actually designed filter specified to make the exact change you want).
I call your un-evidenced description of impedance modified PSU designed to impact sound signature.... err..... bullshit. Either because you've made it up - or if you've actually genuinely found something designed that way - because it would never work properly, and the designer himself was unable to come up with something not containing bullshittery.
Have a nice evening