Thanks - didn't happen by design, happened because I got tired of pack rats undermining the previous precast concrete equipment pads and chewing all the insulation out of a heater. Got rid of the heater as we didn't use it much and then had brick pavers put in to make digging difficult for the pack rats.
Gary
Forgot to mention when we installed the pavers, they are tight between the wall and house foundation. Our Master Bedroom and bath are right by the pool equipment. We originally had a 2 hp single speed pump. When I hooked it back up after the pavers were installed, the vibration (60 hz) was very noticeable in our bedroom. We got rid of the 2 hp single speed pump and went with a Variable Speed pump and as long as the speed was less than 2000 RPM, the vibration was hardly noticeable. To further reduce noise/vibration, I installed the pump on a small precast pad and placed rubber/cork/rubber anti-vibration pads between the precast pad and pavers. At full speed you can still sense a vibration but at 2000 or less it is not noticeable.
Gary