bettlejuice
Registered user
I had the same problem and in addition to deepening the the recesses in the helmet (I used a heated ring spanner which mad a nice flat bottomed recess)I removed the speakers from the plastic cases and just hot glued the bare speakers into the recesses.
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How much thickness did you save removing the plastic cases from speakers. I have the Ultimate ear plugs with speakers and also speakers in helmet. This is useful set up for short trips when you don't want to fiddle with ear plugs. But I find the helmet speakers are pressing onto my ear plugs making them very uncomfortable