Need help with some ringtones for my Razr2

The quality of my ringtones on my Razr 2 with Sprint isn't as good as the ones I sent to my old Krzr with Verizon. Is this because that the Razr 2 has an inferior speaker to that of the Krzr or is it because I'm with a different carrier? The difference surprised me. If I can match the quality to that of my Krzr when it comes to the clarity, I will be very happy. Any helpful hints appreciated.

P.S. I'm thinking I should just create the ringtone, save it directly onto the micro sd card, then put it back on my phone, so that it won't have to be sent wirelessly. I'll get around to it tomorrow and see what comes out of it.

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Alright, the direct transfer from my computer to my micro sd card worked. The quality is excellent, so it appears it's not a speaker issue. However, my phone won't let me assign it as a ringtone. I made sure to save it on the phone, and it is 30 seconds long. It's in MP3 format. If anyone has any suggestions please post.