Well I FINALLY got a reply from the manufacturer:

" The 45db noise level is on the Quiet One 800 up to the Quiet One 6000"

Right. I sent him a note back with a copy/paste from THEIR website:

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Quiet One 9000

High quality, corrosion resistant ceramic bearings help ensure quiet operation and longer life.
Small footprint, with energy-efficient motor, and high-flow rates..
Innovative "cooling chambers" provide air-cooling during dry use and water-cooling in wet applications.
Easily serviced in the field.
Attractive Blue color display packaging targeting the Aquarium and the Fountain markets and Aqua color for the Pond/Water Garden markets.
115V 60 Hz or 220V 50 Hz models available in all sizes.
UL, cUL, CE, TUV-Gs Listed.
Safe for salt or fresh water use.
Quiet operation…noise level less than 45 decibels.
Patented Uni-Direction impeller eliminates need for noisy mechanical device. This allows the pump to always turn in the correct direction immediately.
6 foot cord.
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SURE LOOKS LIKE 45db TO ME!!!!