First, if you like hot sound, turn off AGC. Vice versa, use AGC. Using AGC, you can turn on Matrix function and adjust the stereo in accordance to Stereo Boost. To a proper level, you'll have a very wide sound without excessive phase "tilt". By the way, some AM stereo receivers are quite sensitive to 25Hz pilot tone. Too hot sound will make them drop stereo out.
Second, some parameter to share for you. As to Band mix in Multiband 2 tab, 130Hz=+4.40, 330Hz=+6.02, 860Hz=+4.40, 2240Hz=+2.48Hz. Such setting sounds warm and full of fidelity.
In the US, you can use a full 10KHz bandwidth according to the NRSC standards. Most radios manufactured in the last 10 years have a 3KHz bandwidth for noise rejection. Some newer radios (and almost all C-QUAM radios) have a much better frequency response - and some Nissan radios are reported to have adaptive bandwidth capabilities. This is where you have to work on trade-offs for how much extra preemphasis vs. a screechy sound on radios that have frequency performance above 3 KHz.
I've played with a +5 dB boost on the low band and a +9 dB boost at 5Khz with some success.
The Optimod AM processors (going back to the 1970's) have a 5 KHz boost to counter frequency roll-off and give crispness to voice programming.
Here is an article about AM frequency response filters and phase issues in analog processors. Stereotool's filters are much more advanced and seem to get around these issues (outside of frequency response issues in directional arrays).
https://www.radioworld.com/news-and-bus ... ing-good39
Page 11 of this study shows typical frequency responses for radios in the market:
https://www.nrscstandards.org/standards ... g100-a.pdf
To deal with the 25 Hz pilot tone, we've used a 35Hz high pass filter with a very sharp roll off.
Here are two of my presets - one for music and one for talk programming. They both sounded great on a BE 2.5 KW transmitter into a 4 tower array. The receiver was a Carver TX-11a.