Check out this awesome reply from Pioneer (1 Viewer)

[Allen Longcor]

Here's my question:
I had a question about the Elite 45TX receiver. I have Polk LSi speakers that are rated at 4 ohms, but which actually average around 6 ohms according to Polk. Will the 45TX have a problem driving these speakers? I don't see any mention of ohms in the specs. Also, does the 45TX come with 7.1 preouts to hook up an external amplifier?
Here's the reply:
Thank you for contacting Pioneer Electronics, Inc.
The recommended rating for Pioneer receivers is 8 ohms or more, but 6 ohms should be OK.
Thank you
Hmmmmmm didn't really answer the speaker question and didn't even address the preouts question. Sigh. I have a feeling that the people responding to inquiries at big companies like Pioneer are just people off the street with spec sheets in front of them.

 

[Bhagi Katbamna]

They don't want you suing them because running 4 ohm speakers caused a fire(kind of far-fetched) that burns your house down.