What speakers are you using all around and what are their impedances?

If the rest of your speakers are 6 or 8 ohms set the Outlaw to 8 Ohms.

(I am running 6 Ohm fronts with 8 ohm center, surrounds and cs.)

If the rest of your speakers are 4 ohm set the switch to 4.
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Outlaw 976, Outlaw 7700, Pro-Ject Phono Box S
Sonus Faber Domus Grand Piano (F&C), Niles HDFX (Surr. & Rear Surr.), Outlaw LFM-1 Plus, Velodyne SMS-1
Sonos multi room audio
Video: Sony KDL-46V2500, OPPO BDP-103, TiVo Premiere XL4
2-channel: Outlaw RR2150, SF Concerto Home, Outlaw LFM-2