I'm just now reading through all this and have to apologize for my 1st post. Its really a half ass response, but I did it for a reason. As far as 4 ohms not being an average, thats my error. I always thought nominal meant average (in context of speaker impedance.) I also should have put an exception in for most tube amps and a few SS ones, as well.
When I read the OP, I couldn't make up my mind if it was an attempt by someone who doesn't like high end audio for some reason and just wants to start an argument, or possibly a beginner who just doesn't know. Its just a vague statement with no equipment or examples listed. Usually, when someone really wants to find out something, they do a little better with the specifics. Thats why I made the if you have a good amp comment. I just pictured a beginner with something like a Sony receiver possibly looking to move up. In that context, a typical entry level SS amp shouldn't have too much problem driving a 4 ohm load.
Unfortunately, it looks like I may be right. Everyone here is giving some really high quality answers and the OP is no where to be found. If it makes any difference, I read through all the posts and thought they were truly excellent.
