Thought I'd pass this along to everyone. I emailed Polk to see if their 4 ohm speakers would cause a problem for my Onkyo 595 should I choose to buy them. 12 hours later (excellent response time since I emailed them last night around 6pm pst) I received an email stating that they average around 6 ohms and should work fine with my Onkyo. So don't let the 4 ohms throw you off if that is a selling point. Of course they could just be trying sell me some speakers.