Total posts : 45366
Hmm, this thread has a slight feeling of déjà vu…
Some of this was covered earlier in http://part15.us/node/1247 , but a good review never hurt.
From an anecdotal point of view I can tell you asymmetrical limiting does make a difference in range. I have the Hamilton Rangemaster, and was using a Behringer 2 band limiter-compressor. When I added the Inovonics 222 my usable range did increase noticeably. If you can increase positive peaks from 100% to 125% then you can add almost 6db (I believe) of loudness to your signal. That extra few db will not make your signal go any further, but it will make it usable further towards the edge of your signal.
With 100mw of power, we have a lot of fringe in our signals. By punching up the positive peaks, we make much of that fringe usable. The extra 6db raises the modulation above the noise floor or the signal. As we get further to the edge of our signal, the signal (and volume) drop, until they sink into the noise floor. 6db can more than double your peak volume, and keep you above the noise floor much further out. This is not derived from a mathematical model, but by actually driving around and mapping the difference in where my signal can be heard with and without the Inovonics.
As was mentioned earlier, the Inovonics does not create positive peaks where none exist, it just passes them when they are present. Other (more expensive) processors do create asymmetry, and shape those signals for maximum modulation. But I have found that by running the Behringer hard into the Inovonics, I get a lot more “punch” and more range than I did before.
This does introduce some clipping and distortion, not a lot, and most of that distortion is in the high end which most AM radios do not pick up. For spoken word, (which most of my programming is) the distortion is un-noticeable. I have experimented with the 222 alone, no limiter-compressor in front of it, and you still get a boost in range, and the sound is more musical and less aggressive, and has almost no noticeable distortion.