I'm sorry to hear that you're having this issue.
There probably is a setting in the router that can be adjusted, but you'd probably have more success asking your router's help-line. There is no way to change the frequency in the SWA-4100.
I recently purchased a Samsung surround Sound system with rear wireless speakers. The Rear Wireless Module is the SWA-4100. I currently have my home set up on a Belkin N router which I hardwire into my PS3 to stream netflix and other media.
When I turn on my wireless speakers, my wireless network disappears. This disables my connection to PS3 and disables all wireless access from any computers in my home.
From some threads in other forums i have read, the SWA-4100 works off a 2.4GHz signal which interferes directly with my Wireless Network. Is there any manual settings I can change on my Router so that I can Have both my Wireless Speakers and my wireless internet work simultaneously??