Many here know much more about this than do I but sharing experiences usually leads to knowledge. So here goes...
In the past I have "ripped" tracks from CDs for personal use and have not broadcast them. We have an exception for a family party this weekend where we want to have this particular music playing throughout the house so the plan is to use my FM transmitter (house range only) for this.
I rehearsed the transmission and it sounded terrible. It is well known that content which has frequencies near 19 kHz can cause this and a spectrum display of the audio signal confirmed that such content was present. There is a program I use for audio editing (more later) which has an "audio tool kit" by which a brick-wall filter can be set. I did so using 15 kHz as the upper cutoff and the problem was solved. A better solution would be a hardware filter in the audio chain but none is available to me and for a one time performance getting one is not worth it.
The audio editing program is Nero Wave Editor which came bundled with a CD burner I purchased some time ago. It is a nice editor which I have used many times but it is limited to working with .wav files only. But, there is an updated version available for free from the Nero site which handles all of the popular audio file formats. The link is HERE. Look at the bottom of the page for "Nero Free Applications".
Neil
Very good bandwidth management, Radio 8Z.
Here in the toolshed I have a solution utilizing StereoTool by Hans Zutphen.
Our bandpass filter is set for 125 to 10,240 Hz, which helps keep the AM transmitter from splashing too far in the side-bands.
The bottom end is rolled off because most loudspeakers do not reproduce sounds way down there, and sp[oken voice contains no deep bass.
The overall choice of frequency tailoring is based on a musical spectrum chart which is expressed by octaves. So in essence, I have lopped off the top and bottom octaves, which allows the most important music and speech range to pass through.