Question about Samsung SWA-9500S

A matter of adjustment! I think these speakers, together with the Q900A, are great! In surround mode, they reproduce the content that is playing in the background, which of course sometimes gives the impression that they are rather quiet.

Like the soundbar, you can increase the level of the rear speakers.

The speakers are really something... Without the speakers, it's not a home cinema experience at all. With speakers, at least a little. But if the volume could be adjusted, it would be great.

They are quiet. Where we have them installed, they can't work very well. So I'm not going to say that the speakers are 100% to blame. But something more powerful would be appropriate unless they are installed at head height close to the listener