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I always assumed that hf's would operate in AM or ssb with the same bandwidth in which their capable of.

It's the double ssb they use on AM as opposed to a traditional carrier modulated signal that causes a problem (I thought).

I know that with some time and research one can get their hf to sound nice on AM but I've read that most (no matter what) just can't obtain quality audio on AM.

It's inherent in the design.

I'm going to go with the ts 570 because 1. the price point 2. I've always wanted to own a Kenwood and lastly out of every hf I've heard on AM it not only sound like it was transmitting true Amplitude Modulation but did it better than any cb radio I've ever heard. It truly had a terrific punch. Loud and clear is an under statement. It was warm with a nice but not overly done punch (bass). IMO it was the type of audio that would make anyone proud to be transmitting. Lots of people spend so much time, money and effort on direct injection and outboard audio gear and get their cb radio's to transmit so wide when IMO the audio I heard from this ts 570dg and heil pr 10 actually sounded better. I say that because it sounded much more natural than all that possessed 10 - 20 kHz wide audio that's produced by many of those setups. Maybe it's because I'm listening to them on a standard cb radio receiver (madison).

 I'm not bashing those who go that route because I've heard some incredible sounding audio from some of those setups but truthfully most sound over possessed. The only way I can think of exsplain it is that they sound mechanical. I wish I would've recorded and shared the QSO I had with my local while he was on his 570 DG.. I was and still am extremely impressed with the 570dg on AM. Obviously. I hope I don't sound like a nut. I'm just passionate about AM and never thought or heard an hf sound so nice on my favorite mode. Happy Thanksgiving.