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Our engineers and those at Anagram Technologies (the people that help make the CS 840C) have identified a 'quirk' with the optical output of the Airport Express. Basically, the Airport does not output a smooth SPDIF clocking. Every now and then, the Airport will sporadically adjust its output clock to track the desired sampling rate. These adjustments are very sudden and are the cause of the noises and/or drop-outs described. This is not something which could have been foreseen as it is an apparent 'quirk' of the optical output from the Airport Express and not due to the 840C. Our engineers have however, developed an update which mitigates the effects of this irregularity. If you contact our distributor they will be able to arrange for your CD player to have the appropriate update carried out. This will need to be done by an engineer. They are contactable on the details below; Audio Plus Services 156 Lawrence Paquette Industrial Drive Champlain, NY, 12919 Web: www.audioplusservices.com Email: [email protected] Telephone: 800-663-9352 Fax: 866-656-0686 They also sent me the firwware upgrade and I did it myself and everything is now working just fine. Good Luck.