How to Convert an MP3 From128 KBPs to 48KBPs
Converting an MP3 from 128 KBPS to 48 KBPS is easily done with a free audio converter program such as iTunes, Switch or dBpoweramp. Simply import the MP3 into the program of your choice, adjust the MP3 bit rate settings and click convert. Although converting an MP3 from 128 KBPS to 48 KBPS will significantly reduce the file size of an MP3, it will also significantly reduce the audio quality of the MP3
Converting an MP3 from 128 KBPS to 48 KBPS is easily done with a free audio converter program such as iTunes, Switch or dBpoweramp. Simply import the MP3 into the program of your choice, adjust the MP3 bit rate settings and click convert. Although converting an MP3 from 128 KBPS to 48 KBPS will significantly reduce the file size of an MP3, it will also significantly reduce the audio quality of the MP3
Using iTunes
Open iTunes.
Open iTunes preferences. Click "iTunes" and select "Preferences" on a Mac or click "Edit" and select "Preferences" on a PC.
Open "Import Settings" and select the "MP3 Encoder" as the "Import Using" audio format.
Click the menu next to "Settings" and select "Custom."
Select 48 KBPS as the bit rate by clicking the drop down menu next to "Stereo Bit Rate."
Click "OK" to save the changed settings. Then click "OK" to exit of "Import Settings" and click "OK" again to exit the iTunes preferences menu.
Click "File," "Add to Library" and select the MP3 from your computer that you would like to convert to 48 KBPS. This will import the MP3 into your iTunes library.
Click on the imported MP3, select "Advanced" and click "Create MP3 Version." The MP3 will then be converted to 48 KBPS. When the conversion is complete, the 48 KBPS MP3 file will appear directly below the original 128 KBPS MP3 file. (See References 1).