I'm not sure how to word the question. The 80s should obviously be the best speaker, but which speaker represents the best price/performance ratio? The one that makes you say it's a clear winner over the one below it and also quite competitive with the model above it. Is it the 60 because of the midrange driver's inclusion? The 50 because of the added bass and dynamics edge it has over the 40? Or does the 40 just because it's the cheapest?