Satellite Digital Audio Radio Service (SDARS) is used by Sirius , which uses 12.5 MHz of the S band between 2320 and 2332.5 MHz and XM , which uses 12.5 MHz between 2332.5 to 2345.0 MHz. Presently, music is compressed to 44 kbps; voice, 20 kbps; and 16 kbps for low