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<blockquote data-quote="JimJ" data-source="post: 2001419" data-attributes="member: 555251">Even 128K MP3 is an improvement over FM.When you modulate a signal to RF, the bigger the bandwidth, the more power needed to maintain signal strength. So it makes sense to transmit a really small bandwidth...The left/right information in an FM signal only covers from about 50Hz to 15KHz - it needs to stop there because the pilot carrier for the stereo encoder is a 19KHz tone, and any musical information that high will result in a &quot;chirp&quot; on the receiving end...because your receiver is looking for that steady 19KHz pilot tone to decode the stereo information. So the top end is automatically lopped off. The bottom end isn&#039;t there because modulating strong subbass would simply take too much power than it&#039;s worth, and since most radio receivers aren&#039;t hooked up to subwoofers anyway, who would ever hear it?It sucks.</blockquote>

[QUOTE="JimJ, post: 2001419, member: 555251"] Even 128K MP3 is an improvement over FM. When you modulate a signal to RF, the bigger the bandwidth, the more power needed to maintain signal strength. So it makes sense to transmit a really small bandwidth... The left/right information in an FM signal only covers from about 50Hz to 15KHz - it needs to stop there because the pilot carrier for the stereo encoder is a 19KHz tone, and any musical information that high will result in a "chirp" on the receiving end...because your receiver is looking for that steady 19KHz pilot tone to decode the stereo information. So the top end is automatically lopped off. The bottom end isn't there because modulating strong subbass would simply take too much power than it's worth, and since most radio receivers aren't hooked up to subwoofers anyway, who would ever hear it? It sucks. [/QUOTE]

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