Bass reflex plug

I have great speakers in our small sleeping room (DK-SAT from Hifi-Selbstbau.de) but I had to place them much to close to the wall and as to be expected had to much bass. So I just made this plug to close the bass reflex opening.

Please use rubber bands or as I did cut a ballon in stripes and put it in. If your speakers are also close to the wall you will hear a better reproduction of lower frequencies and hopefully also more details in the upper frequencies.

Scale it as you need it. The original file is for bass reflex openings bigger than 40mm up to 47mm.