There are a few people that are having problem with the noise of the Alpha9500 blower.
If you have guarantee just mail Alpha ( RFconcepts) and you will get a new blower.
But if the warranty is over mabe this tutorial will help ya solve the problem.

 

The first step 1:
Put your Linear on its side of so you can reach the bottom of the amplifier. You will see 2 plates with a lot of screws. Remove them all and take the blower out of the Amplifier.The blower is connected with a simple plug and play connector.

The second Step 2: ( Picture numbers are in front of each explanation)
– 1: we are ready to dissemble the blower parts.
– 2: remove the ring
– 3+4 : Then remove the two screws of the Blower. Turn the blower counter clockwise to loosen the screws.
– 5+6 : Now the blower housing can be removed. Use a big screwdriver to remove the house from the tape.
– 7+8: Then remove the two big screws from the motor.
– 10: Then remove the small round plate from the axle of the motor.

– 11: Now the tricky parts comes. Push with two fingers the locking pin to remove it.
– 12: Then remove the 2 rings that are below the locking pin on the axle of the motor.
– 13+14: Now you can remove the coil of the motor and start to lubricate the axle of the motor with Teflon oil.

Before you reassemble all the parts just turn the coil on the axle as many times as you like, to see if the coil will turn easily on the axle.
Reassemble all parts in reverse order. Before closing the small round plate, lubricate it with a little Teflon inside. Each time the blower turns, it will lubricate itself.

 

73″ all hope this will help ya out with the noise of the Alpha 9500 blower.