hairy_hen said:

All SRC processes unavoidably degrade the audio quality of the original source. SRC algorithms require very steep lowpass filters to reject unwanted high frequency energy at greater than half the sample rate, which is introduced into the signal regardless of whether the target rate is higher or lower than it started out.

I see that Sound Forge has elements of iZotope RX, Ozone, and Nectar built into it, which is awesome. I've recently started using these myself as Pro Tools plugins, and they really do sound great. You can get some very good results from them if you know what you're doing, so if this is what's being used for laserdisc audio preservations, so much the better.

Just to be clear, is this in reference to Sound Forge with anti-alias filtering, or without? I've been using Sound Forge without anti-aliasing since that's what I was recommended a long time ago on another forum (and so far I haven't noticed any audible difference with the original 44.1kHz LD audio) , but I can re-do the resampling with another method if it will produce better results.