Hmmm. Don't know about the Silverback.........Possibly (?) this is another of the differences in the Silverback and Hathaway. Mine has an ARC connection to the Jensen stereo speakers, and a big ole honkin' bass speaker behind the tv. I just switch "source" on the radio to HDMI ARC and it will blast you out of the trailer. That does require an HDMI cord between radio and tv.
If that doesn't have it, I'd think any audio shop could set up a neat system.
"Next to prayer, fishing is the most personal relationship of man" Herbert Hoover
"American by Birth, Southern by the Grace of God"Lewis Grizzard
2016 GMC Denali 3500Dually--2017 CC 36CKTS