I received the new Adda fan and replaced the original Delta fan that was inside the XA2. The replacement was not as easy, nor was the reduction in noise as dramatic as I had hoped. I was unable to locate a 2-pin connector that was the right size, and the mounting holes were larger in diameter than the original fan. To resolve the connector issue, I cut the connector and a short length of wire from an old ATI video card and spliced it onto the fan leads. Fairly simple and straightforward with the right tools. I used #6 nuts and bolts to fasten the new fan to the chassis and placed a grommet between the back of the fan and the player chassis. I then powered up the player and noticed that the whine of the old fan was gone, but there was still too much air movement noise. I am going to try a few other methods of mounting the fan to see if I can further reduce the noise.
My initial thoughts are that the punched grid in the rear of the chassis is too small and that is leading to backpressure on the fan. Adding the grommet may also have increased the back pressure, so I am going to try flush mounting it. A better solution would be to replace the 50mm fan with a 60 mm fan, cut a larger exhaust port in the rear of the chassis and add a wire grid. I do not plan on doing this until the warranty has expired.
A couple pictures of the new fan and exhaust port:
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