I currently have an Arc and two One SLs as surrounds. Primarily used for watching movies. Minimal music listening.

Question: If I am looking to invest more into this eco system do I replace the Ones with era 100s or do I get a sub?

exceptions: I do not want to spend the money for the era 300s and my wife wouldn’t like the size.

So do I invest in a slight upgrade to the surrounds or get the sub for more bass?