Invert phase?

Is there an easy way to invert the phase of a single component in a system? I have three sources, CD, turntable and tuner. The turntable and CD (the DAC, really) are inverted phase and the tuner is not. I have reversed the speaker connections, which corrects for the DAC and the turntable, but that leaves the tuner out of phase with the rest of the system. None of my current components has a phase inverting switch and I don't want to have to switch my speaker cables every time I switch to and from the tuner. Any ideas? Thanks.