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i dont think he is so much asking about overkill, but more along the lines of does he need t ospend that much $$ on a sub for that room & the answer is no.
is this surround or stereo? how efficent are your speakers how much power do they get? if surround, how many speakers are truly full range(can produce viable bass down to 30hz)?
all that aside, something with a a good 10 or twin 8 in the in the 200 -300w range should do you fine. stick with klipsch as i assume that is wha tthe rest of your speakers are. otherwise look at m&k or velodyne.
one thing, almost everybody has to much bass, if well balanced fidelity is what u are after then stick with the range i gave u(depending on some of the info above of course). if u like to thump hard then go somewhere in between.
one other thing unless they r well made/designed, big subs(12 or bigger) dont always give you better bass. a well designed(power req being equal)10 will give you tighter bass than a average/cheaper 12.
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