Best inexpensive speaker switcher??

I am thinking about using a speaker switcher...I have a pair of Mission 70mkii that i will be using for a psychoacoustics circuit...I would like to use the Missions full range also. So a switcher makes sense...but I noticed a Niles spec says the impedance will be 4 ohms. Is this right? The speakers are 8 impedance...so I would rather find a way to keep it at 8 instead of 4. Also my Accuphase P300 can drive multiple speaker pairs...So could I run double pairs of wire connected to the speaker and switch between main and remote at the amplifier...could this be a option. I know there got to be a simple solution....Sorry if this doesn't make any sense...