--- In chromapolaris@yahoogroups.com, "Paul D. DeRocco" <pderocco@...> wrote:

> But I'll reiterate, I doubt you'll hear much of a difference.

I put a TL074 in today with a socket so I can easily swap between it and the LM348 (or other 4xOPAs).

My initial thoughts are that the 074 does seem to audibly improve things. For whatever reason my Polaris seemed to have a noisier than averge headphone output and the 074 seems to have quieted that a bit. Take my analysis with a grain of salt as these sorts of things are quite subjective (as evidenced by the frequent heated back-and-forth discussions comparing the 074 and the 084 on audiophile forums). Placebo effect and big egos reign supreme in those place

I'm sure Paul could cite about 10 other sources of noise in the Polaris that would completely mask any benefits of swapping out the op amps. :-)

I'll try to make same recordings this weekend to see if I'm actually hearing what I think it is I'm hearing.