Audio format change?

I’m thinking of changing the bit rate for the hi-fi versions of my radio show from 64kbps to 128kbps (mono). It would double the size of the file from about 25 megs to 50 megs. Would this trouble anyone? My iPhone has no trouble with 128kbps on the AT&T network—and of course it’d be a piece of cake on WiFi. I’d still keep the 16kbps lo-fi version for people with slow dialup connections.

Thoughts?