Question about Hama Sound insulation, self-adhesive, 50 x 100 cm

The product does not insulate noise. It is mounted where the noise is generated and the sound is absorbed by the surface.

That's all right! Not against noise. I think correct would be: 'takes the HALL' - not 'the sound'. By reverb is meant the reverberation/echo in a (recording) room, which reflects less back into the room. Whereas sound, i.e. the noise can still be heard outside.

But for it to really work for the reverb, you need almost a whole wall/room. The alternative would be two real acoustic panels made of rock wool, e.g. from Thomann (sorry digitec). Two are enough for this, so they are not much more expensive.

I would only use foam directly behind the mic. There are cheap mounts for that. This way the reverberation can be dampened a bit, spreads in the room and again on the way back directly in front of the mic.

The product does not really work well in noise.