speaker phase

route9 (which state, county?): if you have only one (relative) reverting component between your source and speakers, you can reverse the +/- connections on either the amp or speaker end. if your pre and/or source also revert absolute phase, then you have a more complex question. please let us know. -cfb

Route9, yes you need to switch both speakers (or amp)positive and negative leads. I also have CJ preamps and have been doing this.

I wonder who makes source components that have inverted phase?

Off hand, I don't know of any source components with inverted phase, although I suppose it is possible that some tube DACs or CD players do invert. If such is the case it should be plainly stated in the manual. When in doubt, contact the manufacturer. Also, many DACs and some preamps have an inverting switch where one push of the button is all that's required (rather than changing speaker leads) which is a useful feature.

I might add that in the case of an inverting source component connected to an inverting preamp, the two negatives do make a positive, i.e., once the signal leaves the preamp it will no longer be inverted.