LF Roll-off for speech


I have an AT2035 with a Low cut switch. Do you recommend using both the Low Cut on the mic and the LF Roll off for speech or just the LF Roll off when narrating and keeping the mic switch flat?

The one in Audacity also compensates for electrical and USB errors.

It’s not unusual for home USB systems to have horrendous low-pitched sound trash. It’s expensive to fix and why bother? Nobody can hear it.

Rumble is still sound and it still takes up room in the mastering tools. RMS Normalize will produce a nice RMS (Loudness) value by averaging your voice and all the garbage you can’t hear.

That is one tool which isn’t perfect. If you have a low, rumbly, professional, “broadcast” male voice, you may find that some of that silk has gone away. There are alternatives to Low Rolloff which damage the voice less, but may cause problems with normal users.

But you’re right. They do very nearly the same thing. Low Rolloff is designed to mimic the Hollywood filters many people use in outdoor shoots. As a side benefit, it takes out most 60Hz US power errors and all 50Hz European hum. That’s one thing that stops working if you need a custom curve.


I can see a condition where you might need both…!! If you have difficult wind conditions during the shoot it’s possible the only way you’re going to get any recording is with the microphone filter.

But that still leaves you with all the other errors in the shoot.

On the other hand, nobody is recording an audiobook in a high wind. If it’s a choice between slightly “light” or “tight” voice track and no track. Pick the light one.


Thanks Koz

do you recommend recording flat ____ and only using the LF rolloff for voice. I have been using them both together , which is overkill, I guess.

Depends on the goal. In general, if you’re doing music, you want everything flat and depend on your equipment to behave itself.

This is a spectrum analysis I shot a few minutes ago. That’s about normal voice distribution.

Screen Shot 2019-04-11 at 18.09.45.png

If your microphone system still has energy at 20 Hz (on the left) and then starts increasing as it goes more toward the left, then you have problems and can’t use flat music settings (and maybe that microphone system isn’t such a good idea).



I want to thank you for your answers. I haven’t got a clue what it all means. You remind me of a radio engineer at a station I worked for in the 70’s who like you was a brilliant fellow. I remember if I told him a reel to reel was making noise he would get all excited and explain the aerodynamics of an airplane wing. He was an amazing engineer!

you’re the best

Use both all the time. That better?

He was an amazing engineer!

But did he fix the squeaking reel to reel? I know respected engineers that can’t tie their own shoes.

If you’re having trouble sleeping, I’ll explain to you how your microphone works.

As the coil of thin wire moves through the magnetic field…




As I remember he just switched out the noisy one with a replacement.
He fixed it when he ran out of spares. BTW, I’m cool with mics, thanks.

all the best