VPI cartridge install f/phase inverting pre

BEWARE you have to check whether your phono or line stage invert phase.
If the line stage inverts then change the phase on the speaker cables.
If the phono inverts phase then you need to change the cartridge leads otherwise your other sources will end up out of phase.
For diehard analogue fans I have found inverting the phase at the cartridge end ( if phono out of phase ) sounds better than inverting at the speaker end.

04-03-13: Mofimadness
I've never seen or heard of a preamp with a built-in phono
stage, where ONLY the phono stage inverts phase? Usually
it's all or none, but maybe they do exist?

This is very common in older tube preamps, each 1/2 tube gain stage inverts phase and if you have an odd number of gain stages in a stage, it usually ends up inverted. It is not uncommon for either of the line or phono to invert phase.
Pays to check the manual.