Tried again with the sub and noticed in the Real Time analyser it is the same db level as the other channels, but my RS SPL meter (thats Radio Shack btw 
) reads low at this freq range. What SPL meter do you recommend?
Does your SPL meter give you octaves (RTA) or just a flat number? I had your exact problem for a while, and it's really hard to get a sub calibrated correctly with just an SPL meter.
Pink Noise is filtered to have the same amount of sound energy in each octave so if you're using a single number output SPL meter on a speaker that's only putting out sound over a narrower octave range you're going to get a much lower "total" SPL number.
For example, My sub only plays up to about 50 Hz, which is an octave and a quarter of audible sound. My SPL meter shows it being much, much lower SPL than my mains even when it's calibrated correctly, because it's only playing 1.25 octaves, while my mains are playing almost 9 octaves, which means they're about 7 times as loud with pink noise playing (almost 8 dB).
Edit:
If you have an RTA device that will show you levels per octave (or 1/3 octave) you can get a more accurate comparative level that way. Just try to get your sub so that (when playing JRiver's test clip) each octave measures at about the same dB level as each octave of your mains did with their clip (if that makes sense). I can provide a picture of my RTA when it's calibrated if that would help.Just saw you have a flat RTA reading; you're calibrated correctly and there's nothing wrong with your SPL meter.
Sorry for the poor reading comprehension :-)
