Pinnacle Speakers 3 - Manual (Page 9)

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There are two reasons to use this connection option. The first is if your receiver has no RCA
subwoofer output jack! The second is if your system would benefit from having the bass filtered out of the
main speakers. (If you have a Dolby Digital or DTS receiver you can achieve the same results electronically
simply by configuring your main speakers as SMALL and connecting your sub via a Phono cable - See
Option #1). If you have large main speakers that are capable of reproducing a great deal of bass on their
own then this connection option may not be advantageous to you. If however you have small main speakers