Plug Focal 926 front bass port

Still playing around with tuning my setup after adding a REL T/9x. I just plugged the front port on my 926s with some foam that came with my old B&W speakers. The plugs don’t fully cover the port but I think I like it better already. Anybody else on here done similar after implementing a Sub? What material did you use?  I think I can proly find some foam stock and cut me own.