6ohm fronts & 8ohm rears, Yammy RX-V1067 do i change the output settings?

[admin_exported]

Recently bought the RX-V1067 and am very happy apart from the rears not producing much volume. Just had a look, and the Boston VRS Micro rears are 8 ohms, and the MS BR5's are 6 ohms. now i know i read somewhere that the amp can be changed to drive different resistive loaded speakers, but i'm sure it is a general setup for the amp, and not channel specific. If that the case, do i leave it as it is or change the amp to the 6ohm output setting. Would i gain anything, or destroy something?

Your help would be appreciated.

 

[d4v3pum4]

Leave impedance settings as it is and up the levels on the rear channels. The autosetup does work but in the end, it is always worth making manual adjustments.