Help: Remote control controls two devices simultaneously — DVD Players — DVD MP3 AVI MP4 players codecs conversion help

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Hi to All,

I have a Pioneer DV 545. Today I bought a second Pioneer DVD player
(DV 300).
Now if I try to use any of their remote controls, unfortunately both
device reacts :-(

Is there any way to separete devices, or switch one of them to use
alternate remote protocol?

thx for answers.