[Sittler27]

I actually do have a crossover engaged at 60Hz. The only thing I can think of is that the receiver was set to "Pure Audio" mode, which bypasses all internal processing on the receiver. This mode may prevent the crossovers from being engaged, but it is how I listen to music. For movies I use DD or DTS, so maybe I should use the "Direct" mode rather than "Pure Audio".

I haven't done a reading with both the mains and the sub. Where do I select that measurement type? Or how do I do that measurement? Would it just be a matter of connecting both the Left and Right speakers to the sound card? How would I also generate the sub as well?

My soundcard is an MAudio Audiophile 2496, which has L/R RCA inputs and L/R RCA outputs, as well as a MIDI adapter for SPDIF COAX input and output.

It's really my first attempt so sorry about all the questions.

I followed the online help manual instructions, and my steps are summarized here:
1. Calibrated sound card by connecting L/R input to L/R output and taking measurements from the soundcard panel, then saving .cal file.
2. Connected soundcard Right output only to Right speaker input on multichannel mode of the receiver, and set receiver to multichannel mode.
3. Connected Right input on soundcard to RS SPL meter's output and positioned the meter on a tripod at the main listening location.
4. Set RS SPL meter to 80db setting.
5. Using a speaker calibration signal, calibrated SPL to 75db by raising receiver's volume level until SPL showed 75db.
6. Performed measurement by first checking levels (which showed as -29db and too low). If I moved the SPL meter setting to 70db, then the levels were fine. This is the problem I described before. I left it at 80db for the above measurements. Also, I set the End Freq to 200Hz.
7. After measurement, Set Target in order to find the corrected dB.
8. Repeated steps for the other speaker after moving RCA cable to other speaker's input on receiver's multichannel area, still using Speaker Calibration signal.
9. Changed signal to subwoofer calibration signal and moved RCA cable to receiver's sub input on the multichannel area, and performed measurement for subwoofer.

My equipment:
MAudio Audiophile 2496 sound card
Onkyo TX-SR705 AVR
Paradigm Monitor 7s (mains)
SVS PB-10 (sub)
Paradigm CC-370 (centre)
Paradigm ADP-370s (surrounds)

My room:
Large open concept basement (900 sq ft)
But main HT area is 14'x15' (but opened beyond that area to 18'x30')
7.5' ceilings, and in some areas 6.5' (under ductwork, etc.)