Michael,
The iM-490S was actually the first earphone Maximo developed, as part of our Made for Sansa line. It means that we developed and tested it on the Sansa (e200 series), with additional testing, feedback, and approval done by SanDisk. Then when we developed the iM-390 (our second earphone) as a more universal model, we found that it seemed to make sense to simply adopt the same characteristics. So the sound should be very similar. And as a side note, we later had the iM-390 certified by SanDisk as well, for use in our Made for Sansa Travel Kit (which also includes a car and wall charger, and a cable).
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