Auto Tune Sweep Vs Pink Noise


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Level matching your speakers isn’t a topic that gets talked about much these days. With auto-calibration systems like Audyssey MultEQ, Yamaha’s YPAO, Anthem’s ARC, etc., it’s generally done for you. However, while these systems usually yield good results in this respect, it’s never a bad idea to double check the calibration. Fortunately, this is relatively easy to do, as we’ll explain in this short editorial and the related YouTube video below.

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How to Use an SPL Meter to Calibrate Speakers Levels YouTube Video

Mar 27, 2013  Here is a little tuning video. I'm not too familiar with the rta but was able to give you guys an idea of how it works and how it can help you to get some of the rough tuning out of the way. Download sweep tone. The third signal pink.mp3 contains noise. This 'Pink' noise has a particular characteristic (equal power per octave, power density decreases 3dB per octave) that makes all frequencies in the noise equally audible and therefore the pink noise can reveal very small frequency response differences effectively.

The idea is that you use a noise generator (I’ll recommend a free one in a moment) to create the pink noise, and calibrate it so that, at the stereo bus, it registers a sensible average level for mixing on your meters. With the noise level set, you solo your first source, so that it alone plays alongside the pink noise. Audio Test Tones are for the the experts among our readers. These tones are best used in conjunction with external devices, such as a sound level meter or an audio spectrum analyzer. These test tones will help you testing your audio equipment, loudspeakers, headphones, and room acoustics. Some of them can even be used during hearing therapies. I don't have the $2,000 to drop on a 62 band RTA or anything like that. I'll EQ using my 31 band RTA flat to pink noise and see how it goes. My origional thought was to EQ the pink noise with the RTA set to the A-weighting to get that A-weighted curve. But from what I have heard, I should set it to flat, because the curve is built into the noise. Oct 27, 2016  Drew Brashler of stops by MUSIC Studios in Los Angeles to explain how to use Pink Noise and the built-in RTA to ring out your room using the X32 Digital Mixing products.

To manually calibrate speaker levels, first you’ll need an SPL meter set to C-weighting, slow. Place the meter with the microphone facing up towards the ceiling at ear height in your primary listening position. From there, set the master volume to 0dB (assuming a relative volume scale) and navigate your A/V receiver’s settings to get to its trim controls / tone generator. While in this menu, your receiver will output pink noise from your speakers, one at a time, and allow you to adjust their relative level. Fine tune the volume until your SPL meter reads 75dB for each speaker and your subwoofer…and that’s it. If you’d like an extra helping of bass, you can boost the subwoofer level 2-3dB to adjust for preference. Likewise, you can also bump up the center channel a dB or three if you have trouble hearing dialog.

Xfer serum full free download win-osx. Level control / tone generator screen of a Denon A/V receiver.

Why Calibrate to a 75dB Reference?

Only one question usually pops up during this process: what’s so magical about 75dB? On most A/V receivers that utilize a relative volume scale, including all THX certified models, calibrating your speakers to 75dB will make the 0dB master volume setting correspond with “reference level”, which is the specific level at which movies are mixed in the studio. Reference level itself also ties in with actual dB levels. At reference, each of the main channels (left, center, right, surrounds) may be asked to deliver peaks up to 105dB at the main listening position, while the LFE channel can deliver peaks up to 115dB. Make no mistake, reference level can get VERY loud, and we don’t recommend exceeding it for the sake of your hearing.
Still wondering why 75dB got chosen to be the magic number? It’s not a bad question, particularly in light of the fact that commercial cinemas calibrate their speakers to 85dB, as opposed to the 75dB home standard. The difference came about due to simple practicality. While a professional calibrating your local Cineplex might not be bothered by pink noise playing at 85dB, many consumers would be (85dB being roughly as loud as a lawnmower at 1 meter). 75dB on the other hand was better tolerated in a home environment, while still being loud enough to totally overcome the rooms noise floor.


In the age of auto-magic calibration systems, the art of manually fine tuning a system seems to be getting lost. While we put a lot of faith in these algorithms, it never hurts to double-check the results. Part of that is dusting off the old SPL meter to make sure your speakers are properly level matched and adjusted to the correct volume. Once done, all that’s left to do is sit back and enjoy the show.

If you're attempting to calibrate your system for multiple rows of seating, we have a tip that you should read that addresses that too.

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Happy listening!

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