[euwemax]

Hi Everyone,
 
I am recently starting a small modding project with the ultrasone Zinos. First thing I noticed is that they have a little too much bass for my liking and are leaking too much sounds. The sound seems to be leaking form the 6 bass ports that ultrasone put around the Zinos.
 
Does anyone know what material I can stuff these holes with the cover up the bass ports so that I can reduce the bass and at the same time reduce the sound leaking?
 
Here are the materials I've tried so far:
1) 3mm Sheet of polyprene - Reduced the leak somewhat, bass reduced a little
2) Blu-Tack - No effect
3) Regular Foam - No effect
4) Neoprene Foam - No effect
5) Adhesive Tape - No effect
6) Cloth/duct Tape - No effect
7) Aluminium Foil + Foam - No Effect
 
Anyone have any suggestions? Thanks for any help =)

 

[JohnnyTToxic]

Try some sugru or hot glue? or perhaps some tape temporarily on one side, then a few applications of plastidip and some time?