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Keep in mind that those specs I gave you are for a single 808, vs the 2x18 QrX. A pair of 808's will probably go a few dB's lower than the 45Hz of a single 808, plus a few more dB's of output for doubling of surface area. If I'm not mistaken, they're both rated at roughly 136dB continuous, with a peak of 141dB for the QrX vs 139dB for a single 808.
QRX 218 is 150lbs. 808's are horn loaded so they should be louder per watt. I would not want to haul either up a flight of stairs. Spl levels are not always measured in the same way so take manufactures ratings with a grain of salt.