Need? No. Would you benefit from adding one? Yes.
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. I assume floor standing speakers produce enough bass..
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Originally Posted by Theresa /t/1519531/do-i-need-a-subwoofer-with-2-floor-standing-speakers-klipsch#post_24402181
Not just for the LFE channel but also other low bass including with music. I saw the necessity of a sub back in the early '80s when it was far from the norm. It lends weight to music and lessens the load on both speakers and amplifiers by band limiting the main speakers.