Mixing Speaker Impedance?


I am considering purchasing either an onkyo pa-mc5501 or integra dta 70.1.

My question is that both of these power amps have a 4/6 impendance switch on the back of them. How will this effect my speaker setup if I am using speakers that have mixed ohms? My front L/R monitor audio RX8s are 4 ohms, my center gxc150 is 8 ohms, and my surrounds gx1 are 6 ohms.

Thanks,

in advance for any advice.
azag
It will limit amplifier output characteristics in all cases you set, but if done to 8 ohms, your amp may half or even quarter the power to the 4 ohms while to 8 ohms it may have some voltage deficit and probably just half the power.
Last thing you want to do is to half power to your mains. your center channel will mostly work on mid-range and will have enough spl volume.
Resurrecting this very old thread...

I use the DTA 70.1 amp to run everything but mains & subs in a 7.2.4 setup. Currently the center, height and surrounds are all 6 or 8 ohms. I am getting some Tekton MOABs and a Double Impact Center. The DI Center is 4 ohm. Not sure what setting to use. The DI center is very efficient and likely would be fine at 1/2 or 1/4 power.