Not sure what you mean. You own two 100’s and a Sub 4, all bonded to an Arc Ultra? Where do the 300’s come from into play? What do you mean by “drop off”?

I am looking at getting the sub 4 and era 100s. When I say drop off I mean would I notice a major dip in quality from the 300s?

You are just going to get similar replies to what has already been said in your previous thread.

If you purchase the Era 100 now but at a later date decide to upgrade to Era 300, then you can repurpose the Era 100 to another area of your house for music listening.