so ive been on HF for about two years now and honestly for most of that time i just plugged in whatever mic came with the radio and called it a day. but lately ive been getting reports that my audio sounds kind of muddy or bassy and someone on 40m last week literally told me i sounded like i was talking into a bucket which, fair enough i guess.

started going down the rabbit hole on this and now im more confused than when i started. some guys swear by the stock mic, others are talking about compressors and equalizers and speech processors and honestly i dont even know where to begin. my rig is an IC-7300 if that matters. running into a dipole, nothing fancy.

is there a sensible starting point here or do i really need to spend a bunch of money to just sound decent on phone? and whats the deal with the bass rolloff thing i keep seeing mentioned — is that actually important for SSB or is that more of a broadcast audio concern

the bass rolloff thing is real and it actually matters a lot for SSB. voice intelligibility on a 2.4 or 2.8 kHz passband is almost entirely in the 300 to 3000 Hz range and if you're pumping a lot of energy below 300 Hz it's just eating up your power budget without doing anything useful for readability. worse it can cause splatter if the low end is pushing your ALC around.

on the 7300 specifically there's a built in TX equalizer that's actually pretty decent. i'd start there before buying anything. cut below 300 Hz, maybe boost a little around 1.5 to 2 kHz for presence and see what you get. the other thing people sleep on is mic gain — most guys run it too high and then wonder why their audio sounds compressed and distorted. watch your ALC meter and keep it barely moving, like just kissing the bottom of the range. that alone probably fixes half your problem.

the speech processor on the 7300 is usable but subtle, dont crank it expecting miracles. it helps on marginal paths but too much and you start sounding like a robot and people will actually copy you worse not better.

yeah what he said about mic gain is the big one that nobody tells new folks. i spent probably six months with my audio sounding terrible before someone on a local net just flatly said "your gain is way too high" and that was basically it. felt a bit dumb but whatever, fixed now.

one other thing — the physical position of the mic makes a surprising difference on SSB. talking across the mic at an angle rather than straight into it can reduce plosives and breathiness. some of the old timers on 75m sound absolutely crystal clear and half of it is just mic technique theyve developed over decades. not glamorous advice but its free