Talk 15 seconds in various

CD audio: 44100 samples/sec (44.1kHz) * 16 bits/sample * 2 channel (stereo) = 176 KB/sec = 1411 kbps

.wav filesize
15 secs stereo 16-bit 1411 kbps 2585 KB
15 secs mono 16-bit 705 kbps 1293 KB
15 secs mono 16-bit 705 kbps 1293 KB Below 3300 Hz. As in telephone.
15 secs mono 16-bit 705 kbps 1293 KB Above 3300 Hz. Filtered out in telephone.
15 secs mono 16-bit 8000 samples/s 128 kbps 235 KB
15 secs mono 8-bit 8000 samples/s 64 kbps 118 KB Standard digital telephone: DS0.
15 secs mono 8-bit 1000 samples/s 8 kbps 15 KB

	.wav filesize
15 secs stereo 16-bit 1411 kbps	2585 KB
15 secs mono 16-bit 705 kbps	1293 KB
15 secs mono 16-bit 705 kbps	1293 KB	Below 3300 Hz. As in telephone.
15 secs mono 16-bit 705 kbps	1293 KB	Above 3300 Hz. Filtered out in telephone.
15 secs mono 16-bit 8000 samples/s 128 kbps	235 KB
15 secs mono 8-bit 8000 samples/s 64 kbps	118 KB	Standard digital telephone: DS0.
15 secs mono 8-bit 1000 samples/s 8 kbps	15 KB

Compression

Bach 10 secs CD-quality .wav	1729 KB
same Bach 10 secs .ogg compression	194 KB (9x)
440Hz sine wave 10 secs CD-quality .wav	1723 KB
same 440Hz sine wave 10 secs .ogg compression	30 KB (57x)

TelephoneRing.ogg

Emergency Alert System's attention signal.
Two tones: 853 Hz and 960 Hz sine waves.

MIDI 30KB