I sing as a hobby, and usually get to tweak the sound board to make my voice sound good for whatever venue I play. However, occasionally there are actual sound techs for the house and that person will set up the board and adjust it during the concert (if I’m lucky). However, I’ve had a couple that simply did a simple sound check at the beginning with a fancy iPad out in the audience seats, and then sat there the rest of the show listening to tunes on an iPhone. SMITE!!
If you are going to do the job, do the damn job. Know what the knobs are for and what effect they have when changed. Then pay attention to the band during the performance. When the crowd shows up, the audio dynamic changes due to sound absorption. I’m not sure why, but I almost invariably am given way too much bass and my voice sounds muddy compared with my band mates who have higher registers. A good sound tech is such a wonderful asset!
Even on gigs where I set up my own sound board, I’ve had to argue with one person who had a one-size-fits-all EQ form for the sliders, the classic “smile” shape. No, it really doesn’t fit all, and you have no business changing the settings if you don’t know what you are doing. I don’t care if “you’ve done it that way for years because it’s the right way and everyone knows that”. You’re wrong, and get away from my mixer. At one gig, an expert set us up, and within minutes a band member was over there changing things. There is only so much you can do if you want to stay together as a band. Choose your battles.
At my last gig, I set up my mic did a few singing tests to make sure I sounded good for the venue, and walked away for a few minutes while the instrumentalists set up. I came back and did another test just to have confidence, and I sounded MUDDY AS HELL. I looked at the board and someone had turned the mid range down to 0, the treble to negative 10, and the bass up! @#$%@#$!!! I set it back to how I had it and tested my mic again, and sounded good again. I had to assume that one of them thought he or she was adjusting their own levels and changed mine. Glad I caught it before the show.
Start the EQ flat with everything at middle. If you can move out to where the audience will be for your vocal test, do it. Or if the sound tech is adjusting things, he/she/other should be experienced enough to set your vocals to be crisp and clear with good warmth. My mic has a larger diaphragm than most, so it picks up sound (and bass) more easily than other mics. That typically means I need to boost my treble and slightly lower the bass. I sometimes use a high-pass filter to cut mic handling noise, and use the much hated “clown nose” foam cover to mitigate sibilance. Some singers have a cow over that setup because it isn’t the mic they prefer, the EQ is different, and the foam cover they assume always makes the sound muddy. It does not. All of that can be tweaked at the EQ.
I did an article months ago on Mic Shaming that describes how to try out and select a microphone at a store, assuming they will let you. If they won’t, go somewhere else. Sometimes musicians will have a selection and will let you try some if you know them. Some will try to sell you on the kind they use, but you really should try out a few without a preconceived notion hanging over you. But remember, when using someone else’s microphones, PLEASE BE CAREFUL! Don’t drop it ever. Don’t swing it by the cord. Don’t pull it off the cord while the mic is live, unless you push in the release button gently and remove gently. If it is a mic that uses Phantom Power, turn the speakers down before removing the mic from the cord or you will cause a loud POP which is bad for the speakers and the ears of those around you. Treat the speakers with great care also, they tend to cost a lot of money.
I currently use a Heil PR35 handheld mic, a Mackie ProFX8v2 mixer board, and a QSC KW122 powered speaker. I also have a Heil Fin stand mic, but rarely use it. I’m fine using other equipment as well. I chose my setup by comparing what other singers in my area use, and then balancing those choices with my own voice and budget. I am the one most responsible for how I sound at a show, so as much as possible, I want the components to be under my control. Unless there is a known competent sound tech at the board, adjust the settings to where you sound good, NOT just where you think they should be. Test it, if at all possible, or you are setting yourself up for problems.
The first two gigs I did with a band, my voice was muddy (way too much bass). The sound equipment in some venues is genuinely lousy, has been there for 40 years, and should have been retired a long time ago. But venues don’t make money by paying for new equipment and they are in it for the money. If possible, bring your own stuff and use it instead of the venue equipment. Do a real mic test after you set up and SING a song so You Know That You Know That You Know you sound good in that venue. A venue with lots of cloth on the walls, carpet, and people in the audience wearing clothing, will absorb sound. Try singing in a closet full of clothing and your voice almost disappears. Conversely, a venue with little cloth and a lot of hard surfaces will bounce the sound a LOT, perhaps too much to be viable. Tweak the volume and EQ to make your voice sound good in that particular venue.
Read about other people’s experiences online and then try it over and over again. You can learn a lot from other’s mistakes and tips, but in the end you have to actually go do it repeatedly to learn your equipment (and learn to recognize when it is failing). I had a sound board start losing a channel right before a gig, so had to switch. Happily I had an open channel left of the mixer. One gig I tried three mixers before one actually worked normally. That was a nervous set-up.
All in all, get yourself gear that you have tested and like, and get used to how it works. Learn what all the knobs and sliders do. Talk with other singers and instrumentalists. Then go do your best. Some days it just won’t go your way and you have to make the best of it. Some days, you don’t get to change the mixer because a control freak is in charge. Some days an incompetent tech will ignore your band through the show. Some days you have to use 3rd hand ancient crap equipment and end up sounding awful. Which is why, as much as you can, be in charge of how you sound and know how to sound good.