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Well, lets see...
Pase, I'm assuming is either 2 position switch, or a variable knob. This is to set the phase of the signal compared to the input. Because lower frequancies travel slower compared to higher freqancies and such.
The easiest way to tune this is by using your own ears. Set up the system they way that you would like, making sure that all your polarities agree. Then run a bass intensive CD, and tune the phase of the sub until it sounds pleasing to you.
If this is a 2 position switch, it is included so that if the subwoofer is canceling out the bass from the mids and woofers, a quick phase switch can help correct the cancelation.
Next, the frequancy control is merely as 'limiter' or a 'band-reject.' This will cut off the frequancies about the stated number. If you choose 150Hz, it cuts off all signal to the sub that is above 150Hz, same with the 50Hz.
Let me know if that answered it for you.
-SF
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