Quietest 1/2 hp pool/spa pump?

We have an indoor in-ground 400 gallon spa, adjacent to our indoor pool. Both have their own pumps and cartridge filters in a pump room, which is off of the pool room. Even with the door to the pump room closed, I find the noise from the spa pump (1/2 hp Sta-Rite pump) a bit annoying. The pump for the pool does not bother me, even though it is larger, since it runs only at night on a separate timer, but the spa pump runs during the day.

I would change to another brand of spa pump, if I could find a quieter one. Does anyone have any recommendation on this?

Thanks,

Ben W.