Scott said that the 7500 can 2 ohm loads but when you parallel 2 4 ohm speakers the impedance can drop below the 2 ohm level but he also said that the 7500 could handle as much as a 1.8 ohm load.
The speakers that I was playing with had the potential to hit 1.6 ohms so I just wired them in series to see how they sounded.
_________________________
Epson 3500 3D projector
93" Carl's Place Flexiwhite DIY screen
Outlaw 976 Pre/Pro
Outlaw 7500 for LCR & L/R surrounds
1- Emotiva Mini X-A100 for rear surrounds
2- Outlaw LFM-1 EX subs
Oppo BDP-105 Blu-ray/DVD/SACD player
Outlaw LCR (Snell Labs) for center channel duty
Tekton Lore monitors L/R
4- Emotiva ERD-1s surround speakers
Monster HTS3600MKII power center