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Pre-emphasis and De-emphasis:As a means to squeeze more radio intelligence (the music itself as converted to radio) into the allotted space provided by FCC regulation, one scheme that has been employed by broadcasters is what is called Emphasis. Pre-emphasis amplifies the high-frequency components through a simple Pre-emphasis circuit. In North America 75μs is used, and in Europe, 50μs is used. In order to have a normal frequency response, a De-emphasis circuit is added to the radio receiver. Just as the same as Pre-emphasis circuit, it has a time interval after receiving the radio waves, and it is the same as the one of Pre-emphasis circuit. Low end consumer FM transmitters may not include functional Pre-emphasis and thus this is another factor in why your station is not as loud. Choose a transmitter with this capability and ensure it is properly set for your region.Audio Compression and Limiting: Via SoftwareThis is likely going to be your least expensive solution and depending on your computer sound hardware (sound card) and the quality of the software, you could achieve very acceptable results. This will, of course, dismiss your iPod from the conversation. Sadly it looks like users of Microsoft Windows have more options as compared to Linux users. We will look at Macintosh, Windows, and Linux as this article is expanded. However we will start with Linux as the nature of the Operating System adds no additional cost to our endeavor, and the PulseAudio sound system built into modern distributions such as Ubuntu and Mint is very capable of allowing us to add audio processing.Software to Mention:Audio Compression and Limiting: Via HardwareConnecting an audio processing device between the audio source (including your iPod) and the transmitter makes it possible to apply audio compression and incorporate a limiter to give your broadcast volume that extra boost without distorting. And, as an added bonus, your audio source is not limited to the use of a computer as opposed to the software based audio processing method. However, quality audio processing equipment is going to be expensive. You will likely spend more on the audio compressor device than you spent on the transmitter itself, or at least just as much.