so ive been running SSB on 40m mostly, sometimes 20m, and ive gotten a few comments that my audio sounds kind of muffled or bassy. im using an IC-7300 which honestly should not be this hard to get sounding decent but here we are. mic is the stock HM-219 that came with it, just talking into it at normal distance.

i did mess around in the menu a bit and turned on the TX tone filter thing but im not sure i set it right. a buddy of mine said something about the TX bandwidth being too wide but i dont really know how to narrow it without making it sound worse. do you guys cut the bass pretty aggressively on SSB? like i always assumed keeping a fuller sound was better but maybe not for voice intelligibility on HF.

also is the stock mic even worth using or should i just get something else. ive seen people swear by the Heil stuff but thats a whole other rabbit hole

yeah the stock icom mics tend to be pretty bassy by default, not ideal for SSB. what you want to do is go into the menu and pull up the TX equalizer settings — on the 7300 you can shape the audio response pretty specifically. a lot of guys run a high-pass filter starting somewhere around 300hz and roll off anything above maybe 2700-2800hz. SSB bandwidth is limited anyway so youre not really losing anything by cutting the lows, youre just getting rid of mud that was never helping intelligibility to begin with.

also check your compression settings. a little bit of TX compression can really help punch through noise on HF but if you crank it too far the audio gets that nasty pumping sound and intelligibility actually gets worse. id start with compression around 3-4 on the 7300 scale and see how that sits. get a friend to give you a real signal report, not just an S-meter reading, like actually tell you how the voice sounds on the other end.

honestly the Heil PR-781 made a noticeable difference for me compared to stock mics, its voiced more for communications use so it already has a bit of that mid-range presence baked in. but you can definitely get the 7300 sounding decent with the stock mic if you dig into the menus, i just never had the patience for it lol. one thing i will say is mic gain matters more than people think — running it too hot introduces all kinds of distortion that sounds like mud on the receive end even if your ALC looks fine on your end.