My impressions have been that volume was never an issue for me, just sound quality in general and the lack of bass with the speakers. I've read of some replacing the speakers with speakers from decent headphones. On my modular, I have a clamp that allows me to use the speakers or plug in ear buds. The ear buds make the sound as good as the quality of your ear buds. As for the speakers that come with the clamps, they work fine for GPS , intercom or telephone, but much rather listen to my bikes speakers for the music.