My new Paradigm speakers have me a bit confused. Hopefully someone can explain what these specifications mean. In the speakers specifications they list "Frequency Response" and "Low Frequency Extension." What is the difference between these two number? Here's an example from the Studio 40 specs: Low-Frequency Extension: 34Hz (DIN)* Frequency Response: On Axis + - 2dB from 59 Hz- 22 kHz 30 degrees off Axis + - 2dB from 59 Hz - 20 kHz *DIN 45 500 indicates -3 dB in a typical listening room. I'd like to know what the lowest setting is I can use for my subwoofer crossover w/o having any holes in the sound.