You shouldnt need an additional sound card or amplifier of any kind. *** 1 year later Update ***The speakers held up fine so far. puerto rico af1 Edit, I feel like an idiot. And the hooks look very rustic. puerto rico af1 Dont drive in them though, take them off then put em back on once you reach your destination. puerto rico af1 After just two months of only indoor use, the fabric is already worn out in the heel, and my apartment is small, not living in a big house. Me gusto creo que es un buen producto relación costo/beneficio, llego a tiempo y me funciona muy bien para mis necesidades. Reliable to hold my phone during riding, does not fall off on bumping trail. puerto rico af1 It is possible, but takes a few minutes of pulling and pushing. The extra o-ring made my lock a secure fit as well.
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