I added a powered Alpine subwoofer (Alpine
) to my Seneca, really filled-in the missing bass from the stock dash speakers. Fit very nicely under the passenger seat. Has a remote level control so I can dial up the "thumping" when desired. Doesn't help as much when using the stereo for the front TV, a sound bar is in the works to help out with that soon. I also added Sirius to my Clarion head unit with a "trucker" mast mount antenna mounted to the right side mirror bracket. Works very well with few dropouts on my trips to New England and IL.
Thinking that the dash speakers are next in my quest for better sound.