AVS Forum Special Member
Join Date: Oct 2010
Location: Somewhere in New Joisey
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Buy the best you can for the product you're looking to replace now, and then worry about the other stuff when the time comes. A minor upgrade will only satisfy for a short period of time, whereas a major one will be worthwhile for a long time.
120Hz is too high to begin with, so you might want to revisit that. Anything above 100Hz will tend to cause localization issues, along with other anomalies like 'chesty' sounding voices. Either way, the upper frequency roll-off point is only relevant if you're going to be setting a crossover point within say 20Hz of that range. If you end up using 80Hz then it doesn't matter whether the sub is rated to 150Hz or 200Hz because you'll never get anywhere near it.
If you take yourself too seriously, expect me to do the exact opposite