trying to hook up Seisenheimer wireless tv headphones into the my new HTS-3500 home theater system

I just purchased the HTS-3500 "home theater system". I'm trying to hook up Seisenheimer wireless tv headphones into the system and lists this connector that must go into the reciever:(Adapter: 3.5 mm / 1/4" (6.3 mm)
Adapter: RCA/3.5 mm) so I can listen to a movie at my own volume (I'm hard of hearing), and my wife can listens thru the system speakers. Where can I hook them up, and is there a setting that needs to be reset?
Thanks

Unfortunately; this is NOT feasible with the HT-R391 receiver. As it has NO Pre-Outs on the receiver- once you connect onto the HEADPHONES jack- it cancels the audio outputs of all speakers until removed from the HP jack.

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