I dont have any experience with those exact filters, I have a Emporer 400 on my 75 along with a penguin 280 I believe..may be a 200.. anyways, when my filteres start to get loud, it is normally due to sand between the magnets in the actualy pump section. When that happens I remove the filters and wash out the filter boxes and wipe down the magnets with a non-abrasive cloth. Make sure that there are no scouring marks on the magnet that spins. Those marks will cause a slight unbalance and will create its own noise without sand. :/
For the powerheads, make sure they are secureed tightly. If not, tehy will vibrate against the side of the tank and can cause a very loud racket.
Sometimes, a filter pump can get messed up beyond repair, I have an aquaclear 300 that is like this. For that instance, you normally need to get a new magnet for it, some LFSs carry repair parts, else you can find them on the online fish shops or order from the manufacturor.