The sound is quite stronger, it needs a bit of adjustment because not all helmets have a 45 mm recess for headphones, so they may not stay in place easily. I added the extra extensions that Cardo provides with the package and everything is fine. But my helmet had space around the ears and it doesn't bother me; also, I always wear it with a balaclava and my ears don't fold. I recommend it along with a base to install the intercom in another helmet. I do NOT recommend it for upgrading existing JBL headphones (40mm); also, for Cardo that doesn't initially have JBL, it won't work well because the intercom doesn't have JBL's equalizers

If you have the basic Cardo headphones, like me who had the Spirit 32mm, the upgrade is significant and worth it! The 45mm JBL speakers, combined with the code they give you to unlock 3 audio profiles in the Cardo app, make a difference in sound and bass quality!