so ive been on HF for about a year now, mostly on 40m SSB, and i keep getting reports that my audio sounds 'boxy' or 'in a barrel' which i've heard is a common thing but cant figure out what's causing it. my setup is an IC-7300 with the stock mic and im running it mostly default settings out of the box. i did mess with the TX bandwidth a little bit trying to narrow it down thinking that would help with interference but maybe that made it worse?

also i noticed some guys on the band sound absolutely crystal clear like they're in a studio and others sound like they're calling from underwater. is that mostly the mic or is there more to it than that. i dont have a $500 mic or anything, just wondering if theres settings i should be looking at first before i spend money

the TX bandwidth thing is probably your culprit honestly. a lot of people tighten that up thinking they're being neighborly on the band but if you narrow it too much on SSB you're chopping off the high end presence frequencies and that's exactly what gives you that muffled barrel sound. on the 7300 i'd reset the TX bandwidth to something like 100-2900 hz as a starting point and see how that changes the reports you're getting.

also check your mic gain — if you're overdriving it even a little that causes compression artifacts that sound terrible. watch the ALC meter while you're talking and you want it barely moving on speech peaks, not pinned. the built in mic on the 7300 isnt bad honestly, i used mine for about two years before switching and people said it sounded fine. the radio itself has decent processing built in, just dont crank the speech processor too high, that's another thing that'll make you sound like youre in a tin can real fast.

yeah what he said about the ALC is important. i spent like three weeks thinking my mic was trash and turns out i just had the mic gain cranked way up because i thought louder = better. it doesnt. had a buddy record my audio off the air and it was genuinely painful to listen to. once i backed the gain off and let the radio do its thing it was completely different.

one thing i'll add — mic placement matters more than people think on SSB. talking off-axis into the mic or being too far away changes the sound a lot. not trying to be a broadcast engineer about it but just keeping consistent distance helps. i'm on 40 a fair bit too if you ever want an audio check, feel free to holler