Both Wireless Sub Woofers Picking Up Head Unit's Transmission

I have two Sony 3-piece sound bar systems with wireless subwoofers.  Both subwoofers pick up either head unit's wireless transmission.  So if I'm watching TV in the living room and my wife is trying to sleep in bedroom the subwoofer in bedroom is sounding the bass from the living room's head unit.  Right now we, of course, unplug the subwoofer but sometimes we're both watching tv separately.  I've talked to Sony tech support and they told me to change the switch on the subwoofer.  I have one on channel 1 and the other on channel 3.  This doesn't fix it.  I'm surprised Sony doesn't offer the plug in transmitter/receiver pairs with different transmission frequencies so this wouldn't be a problem but apparently they don't.  Any solutions out there?