Sorry about the title I mean to say 350-400..
As for me I was looking at the 350, for somebody that is not to knowledgeable I thought it would enough for me, and I can just set the crossover setting with the Yamaha..
As for placement I had this problem with my last Polk sub was that it was next to my left front tower and never really heard it all that well except when I got up to leave the room all of a sudden there was "sub".
So for this one I was thinking about to the right of my sitting position about 6 feet away in the corner.
Thanks
What you are describing with your present sub is room modes - peaks and dips in the response. Basically the sub wasn't placed in the optimal spot for your listening position and you were sitting in a "null". This is all fixable.
So when your waiting for your new subwoofer, google the terms "subwoofer crawl" in the search engine and read about it. This will help you in providing the best placement and extracting the best performance of your new investment.