Pump Ringing

[kelemvor]

So, my pool pump is making a progressively louder (day by day) ringing sound when running. I was guessing bearings. A few google searches later tell me the bearings can be replaced by a machine shop, but according to the AO smith website, the closest shop is a few hours drive. I'm thinking of just replacing the motor.

The local pool store has them in stock for almost exactly the same price I've been able to find on the net ($250)... which kind of surprises me, usually the pool store is MUCH more expensive for parts.

Now I come to my question. Without replacing my plumbing, is it likely I could replace it with a more efficient pump or a quieter pump or whatever?

It's only a 12k gallon pool with spa (including spa volume); but it is driving a waterfall as well.

Existing 1.5HP 3450RPM 1.1SF (AO Smith C48L2PA105)
Photo of pump label: