Mark,
These Polk Audios frequency range
is 35Hz - 26kHz. I should be receiving my SVS 20-39CS sub (www.svsubwoofers.com) this week. I agree that there may be a Bass Management defect, because not I've noticed whether I put the speaker on Large, or Small it doesn't matter, there is no difference.
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I just didn't think they made radios like this anymore then ....there's Outlaw !!