03/09/2026
🩺 MIC DOCTOR: Please stop turning all the k***s up!
Two completely different faults. Two fitness sound systems. And nothing actually broken.
I had a message recently from a fitness instructor. Let's call her Sarah, because she's specifically told me to make her name up. 😂
She'd been using the same Trantec S4 wireless system and Wharfedale Titan speaker since around 2019.
Her problem was simple enough to describe.
The microphone was loud. Plenty loud enough, in fact.
But people in her classes were telling her they couldn't understand what she was saying. She agreed. Her voice sounded muffled.
She'd already checked the gain and, given the age of the equipment, asked the perfectly reasonable question:
“Is it time to replace it?”
Maybe.
But before replacing a microphone, it's worth establishing that the microphone is actually the problem.
First suspect: the speaker
Because she was using a Wharfedale Titan 12, the first thing I suggested checking was the HF driver.
A speaker like this doesn't produce the whole frequency range from one driver. The larger driver handles the lower frequencies, while the HF driver behind the horn at the top produces the higher frequencies that give speech much of its clarity.
If the HF driver has failed, turning up the microphone isn't going to help.
You'll just get louder muffled speech.
So I suggested playing some music and listening specifically to the horn at the top of the speaker.
She did.
The HF driver was fine.
Good. One possibility eliminated and, importantly, we still hadn't bought anything.
She then started looking more closely at the controls on the back of the speaker.
And found the problem.
The LOW control was turned way up
The Titan has HI and LOW EQ controls on the back.
The LOW control had been wound right up.
So the speaker was adding a substantial amount of bass and low-mid content to her voice. The microphone wasn't necessarily becoming quieter, but the frequencies that help us understand speech were being overwhelmed by everything underneath them.
She reset it, experimented with the settings and tried it properly during a class.
Her message afterwards?
“Everything sounded much better, thank you!!!”
Seven-year-old wireless system.
No new microphone.
No new speaker.
No repair.
Just one k**b in the wrong place.
And then, almost on cue, it happened again.
Different studio. Different fault. Same basic problem.
I'd recently visited another fitness studio and replaced a faulty amplifier.
When I left, the system was loud, clear and working as it should.
I then heard that they had another problem.
When the instructor spoke into the microphone, the music was cutting out.
Now, I'd noticed something on previous visits to this particular system.
For whatever reason, somebody seems to have an irresistible urge to turn every control on the mixer fully, or almost fully, clockwise.
More must be better, presumably.
It isn't.
Having all your input controls wide open can introduce unnecessary hiss and noise, but one particular control on this mixer causes a much more obvious problem.
VOX Talkover/Damping.
It's actually a useful feature.
When the instructor speaks into the microphone, the mixer can automatically reduce the music slightly, making the voice easier to hear.
But the control determines how much the music is reduced.
A little bit of damping and the music gently drops underneath the instructor.
Turn it fully up and the music can be almost completely suppressed every time the instructor speaks.
Which was remarkably similar to the fault being reported.
I suggested checking it.
And, having corrected the controls, the problem disappeared.
So, two faults in a matter of days...
One system had a microphone that was loud but sounded so muffled people couldn't understand the instructor.
The other sounded perfectly good until someone spoke into the microphone, at which point the music disappeared.
You could quite reasonably have suspected a failing microphone in the first case.
You might have wondered what had gone wrong with the newly repaired sound system in the second.
But nothing had failed.
Someone had been turning k***s.
And that's why one of the simplest pieces of advice I can give anyone using a fitness studio sound system is:
Please stop turning all the k***s up! 😂
A k**b isn't necessarily another volume control.
An EQ control normally has a neutral position for a reason.
Gain needs to be set appropriately for what's connected to that input.
Bass and treble controls change the sound rather than simply giving you “more”.
And things such as VOX, talkover, compression and limiting can completely change how a system behaves.
So if your studio system suddenly starts sounding strange, don't immediately assume something needs replacing.
And don't start turning everything clockwise in the hope that one of the k***s fixes it.
If you're not sure, take a photograph of the controls before touching anything.
Then you can always get back to where you started.
Or send me the photograph.
The Mic Doctor might just be able to save you from buying something you didn't need.
