Soundtouch 300 Does not produce surround sound
I have been building up my Soundtouch 300 based home theatre/music setup in my basement and overall I am very impressed. I added the Bass module 700 and that is a very good product that produces non-boomy bass that is very low in distortion.
I was on the fence about the surround 700 speakers so I figured I'd try the Virtually Invisible 300s at first and see how it worked out. So far, I'm glad I didn't spend the extra on the 700 surrounds because it appears that the surround is really "extended side speakers". I have my TV sending PCM through the ARC and confirmed with a receiver and other speakers that my input source (DTS test video) is producing a DTS signal with a point source section of the audio track. The surround will be the only speaker producing sound. This is the crux with the soundtouch 300, when the surround speaker signal is playing you still hear sound from the soundbar which is not true to the input source.
So far my conclusion is that Bose uses the surround speakers to "extend" the imaging into the room via a point source rather than adding the surround speakers as a discrete channel. The surround speakers do add ambience but it isn't the discrete surround that I was hoping for/expecting based on the advertisement on the Bose website.
So far I've tried playing movies with known discrete surround signals through my Samsung smart tv and my playstation 4. I've used Netflix, YouTube, Prime Video and Disney+ (configured as DD+).
Am I the only one to notice this?