so ive been on HF for about two years now mostly doing FT8 but been trying to get into SSB more lately and i keep getting reports that my audio is kind of muddy or bassy sounding. running an IC-7300 into a dipole, nothing fancy. the mic is just the stock HM-219 that came with the radio. i watched a few youtube videos about the speech processor and compression settings but honestly came away more confused than before — some guys say max compression, some say none at all, some say a little. i set my ALC to be just barely moving and i thought that was the right thing to do but apparently my transmitted audio still sounds off to me when i record it on a SDR dongle across the room.

the recording sounds like im talking into a bucket. tried rolling off some bass on the radio's TX equalizer but i dont really know what im doing there. is this a mic technique thing or a settings thing or what? any starting point would be helpful because right now im just kind of poking around in the dark with menu settings

yeah the HM-219 is a pretty mediocre mic honestly, its not terrible but it picks up a lot of low end and the IC-7300's default TX EQ settings dont really compensate for that. first thing id try is going into the EQ and cutting anything below like 200hz pretty aggressively, maybe 6 or even 9db on the lowest band. voice intelligibility on SSB really lives in the 300-2800hz range and anything outside that is just adding mud or hiss without actually helping people copy you.

on the compression thing — the answer is really it depends on conditions. on a quiet band with a strong signal, no compression needed, just sounds unnatural. but when bands are rough or you want to punch through some QRM, a little TX processing helps. key thing is the ALC should be barely tickling on voice peaks, not averaging there. if its sitting at the ALC limit the whole time youre talking that means somethings overdriven upstream — could be mic gain too high. try dropping mic gain a few clicks and see if the audio cleans up on your SDR recording. the 7300 has pretty good monitoring tools, use them.

same boat here not too long ago. one thing nobody told me for like six months was to actually talk across the mic not directly into it. like angle it slightly off to the side of your mouth. cuts down on the plosives and that boomy bassy sound a lot. sounds like a small thing but made a noticeable difference when i checked my own recordings. also make sure youre not sitting right next to a reflective surface — my desk was basically acting like a bass reflector and it was making everything sound worse. that probably sounds crazy but it actually mattered.