Sound Quality changes between itunes 8.2.1 and itunes 9.1

I am using itunes and a modified Airport Express as my audio source in my Hifi Stereo system.
It is working so well that I have discarded my high end audiophile CD player.
However I found an issue with itunes consistency from version to version in audio quality.
Here is the experience I conducted:
Using:
- a mac mini with Snow Leopard and itunes 8.2.1 and a macbook pro with Snow Leopard and itunes 9.1.
- Identical Wav (full res 16bit 44.1Khz) files local to each mac.
to be completely accurate the music used was:
Ben Webster Meets Oscar Peterson: T01 The Touch Of Your Lips
Diana Krall Live in Paris: T11 A Case of You
- in both cases itunes streams to the Airport Express (same one)
-> The result is that the there is a difference in sound between the two itunes, and I would like to understand what changed or why this difference?
If I were to describe the differences I would say that itunes 8.2.1 delivers a softer sound with more medium than itunes 9.1. Itunes 9.1 would have a brighter sound with less medium than itunes 8.2.1.
(On a side note, not relevant for the problem above, but could interest some people: When I access with my mac with itunes 9.1 the itunes 8.2.1 library on the other mac, the sound quality streamed to the AE is poor compared to either itunes version used with local files. I wonder how apple streams the music from one itunes to the next but that music it altered may be compressed in this case.)
Message was edited by: cdfr

Chris thanks for this answer.
I did check the settings on both Macs/itunes and they are identical. Everything is disabled. The remote volume is also disabled on both.
So the sound quality difference cannot be explained by that.

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