So based on what we've learned so far do you really think there is anything that is truly a 8-ohm speaker?

Actually the statement by Outlaw is a bit concerning. For eaxmple, let's say you believed company K who said their speakers are 8-ohm so you attached four of them to your 2150 which burns up mid-way through your house party. Would Outlaw honor the warranty because they consider the speakers to be 6-ohm?

Honesty, I think you'd be OK running your four speakers as long as you don't crank the volume.