Phase Inversion in Preamplifer?

The line and phono stages of the Audible Illusions Modulus
series are both phase inverting, but since the phono stage
output is always routed through the line stage (unless you
are using the phono stage only through the tape output) the
net result is that your sources input directly to the line
stage will be inverted in polarity while the phono stage
input will be in proper absolute phase. Whether you will be
able to hear the difference is debatable, but the easiest
way to achieve correct phase for all sources is as follows.
Reverse the polarity of both speaker cables at either the
amp end or the speaker end (not at both). Then also change
the polarity of the connections to each channel of your
phono cartridge. This will resolve your absolute phase for
both line level sources as well as your phono playback.

Preamps by Conrad Johnson all invert phase. I could not tell any difference by changing the polarity to my speakers. It is also interesting to know that many recordings are recorded phase inverted. Since your preamp inverts phase some of these recordings should turn out just right if you can hear any difference at all.

Sugarbie - you're correct about phase inversion and polarity. In my case, while it is called a polarity switch on my phonostage, the manufacturer suggests it is used to invert phase.

Clio09,
I just wanted to be sure that when you made the statement
" voice phase tests swapping the speaker leads made no difference to my ears. However, swapping IC leads did"

That you understand that swaping speaker cables chage polarity in each individual channel, while swapping Interconnects just swaps channels r l

Autio, re-reading my post I did not make myslef clear. Swapping the speaker leads at the amp binding posts (+ to - on each channel) I could hear no difference, meaning the voice on the test CD stayed centered and was well imaged. However, with the speaker leads wired correctly, swapping the RCA leads at the amp inputs so that L from preamp output goes to R amp input and R preamp output goes to L amp input, I could hear a difference. The voice on the test CD was not centered, instead appearing as if it were coming from different areas.