There are individual channel trim levels in the 950 before the signal goes to the 7100. The 7100 does not have user level adjustment in each channel.

I agree with SH, regarding the impedance/power/sensitivity issue.

If some part of your brain just "needs to know," then yes, for an identical signal, if speaker A exhibits an actual impedance to that exact signal that is slightly less than speaker B's impedance to that exact signal, then the amp will deliver slightly more power to speaker A than it does to speaker B. This is no problem for the 7100 or for you.

My earlier point was that: one, you are well within normal operating standards; two, you will be making adjustments to the level of each channel to take care of a variety of factors in sound reproduction and listening environment. Any overall signal level inequities that are introduced by impedance/sensitivity issues will be averaged in with the other factors as you adjust. Impedance/sensitivity issues of this type are some of the "small stuff" for which the words, "don't sweat" apply.

Some people use identical speakers all around, but that is more for differences in factors that have a much greater effect than impedence/sensitivity. If you're happy about the way the speakers sound together ...

Relax. Enjoy.