AVS Special Member
Join Date: Dec 2007
Location: Southern California
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I'm not sure what you mean by "highpass crossover" and "lowpass crossover'.
Are you talking about your subwoofer controls or receiver software menu settings? I am assuming you mean the controls on the sub'
In any case, your main speakers and sub are probably interfering with each other and working poorly with those settings and connections. In any case, any female voice is well above 200 Hz so there is some kind of indirect or "masking" effect going on.
The Polk RT25i is rated by Polk to go down to 50 Hz, but that is a GROSS misrepresentation.
According to the tests performend by Stereophile in their lab, That speaker is actually nearly 5 DB down at 80Hz , so it is only going to operate at 100 Hz and higher. It is pretty much worthless below 100 hz. Any "bass" you are hearing from them is going to be above 100 Hz.
This means that your subwoofer needs to be set to operate up to 100 Hz, BUT NO HIGHER!!!!!
The worst thing you can do is to have an OVERLAP in frequency operation between the two. I am sure that is what was causing your problem.
Set the filter on the sub itself so it operates ONLY below 100 Hz.
The main thing is this; you should run 14 gauge or 12 gauge speaker wires DIRECTLY from the receiver to the main pair of speakers, THEN run smaller wires (16 or 18 gauge) from the speakers to the sub input terminals. The wires from the speakers to the sub can be much smaller because they carry only a very small signal current when hooked up in this manner.
This way the main speakers will not be compromised and will operate directly off of the receiver without interference (all receiver software should be turned OFF).