Beautifully slim for any helmet

After I had equipped my Giro Giro helmet with speakers I was impressed by the sound and horrified by the wearing comfort.
The Giro speakers produce a good sound with lots of bass. The large magnets and membranes are very thick (about 17mm).
That was after 2 to 3 hours become unbearable to the ears.
I have therefore bought Kokkia's flatter than alternative. When you are not exempt from the fabric extremely flat (ca 3mm).
This contributes perfectly and fits into every helmet.
Unfortunately, this comes at a price in the sound. Mids and highs are OK. Bass there is none.
But for me to be still the better alternative for shallow Musikberieslung playing sports without the environment too distracted.