Stereo Speakers behind a perforated screen- How much loss in sound?

How locked into your existing screen? ... there are some electric retractable AT screens out there.
I have Centerstage AT fabric for a DIY that I never got to in old house where I had a huge HT room ... and now looking at a retractable one for the new place to overcome some space issues.

Oh ... and tab-tensioned too, of course

Aside from screen permeability to pass sound, you also give rise to odd reflections etc.

Only solution I can see is the one I've used - a screen that retracts when you want to listen to two channel (and in my case a different preamp/amp that sounds better but has lower output than my AV amp path).

My main speakers around now outside the screen area in my new listening/viewing room, but in my old smaller room, the speakers were right behind the screen - minimal loss of SPL if you get a quality screen made for audio transparency.