Bars toward the left, in shades of red, indicate a cut to the volume in that band. Bars stretching to the right, in shades of blue indicate a boost in level. When the filter is doing no work, you'll see nothing in the interface (no colored bars). The user interface for this filter resembles the multiband compressor UI, but has some important distinctions. It simply fixes the audio relatively slowly while attempting to be as transparent as possible. When doing large amounts of correction, the filter should be unobtrusive. When audio is playing that is properly balanced, per the settings, this filter will have virtually no effect on the audio. That's where spectrum correction comes in, to fix material that is imbalanced before it hits any further filtering.
![auto eq stereo tools auto eq stereo tools](https://www.flux.audio/wp-content/uploads/2018/02/stereotool-1.png)
If the amount of highs drops even further, there's nothing the multiband can do to correct it, and the audio will become muddy and dull. That is suboptimal, because the multiband now has no margin of error. The top band of the multiband section will release and could end up doing almost no work at all. Now a song comes along that has very little high end. Let's say incoming audio usually produces about 10dB of gain reduction in MB1 and all bands are roughly equal in the amount of gain reduction they're doing. This is usually not a problem, but it can become one on some material.
![auto eq stereo tools auto eq stereo tools](https://i.ytimg.com/vi/qCSd12nxzZQ/hqdefault.jpg)
Without spectrum correction, the multiband sections are responsible for two jobs: 1) Controlling audio levels, and 2) Dynamically re-equalizing incoming audio. If this filter is boosting the level in some band(s), it is reducing some other band(s). Furthermore, using it does not require any subsequent filters to be altered to accommodate it. Spectrum Correction is not a compressor and does not affect actual levels, overall. Subject to user settings, this filter will attempt to keep levels in the bands at a Target level with respect to each other. Using the familiar Bands user interface found in MB1 and MB2, it can be configured to precisely match bands already in use elsewhere. This filter is a dynamic re-equalizer that operates before the AGC in the processing path.
![auto eq stereo tools auto eq stereo tools](https://d29rinwu2hi5i3.cloudfront.net/article_media/fb3f94e7-775e-41c3-ba03-e0cc844df085/02_surfereq-2.jpg)
Back to overview Documentation version 9.23Īdjusts the spectrum without compression, making it possible to generate a very consistent sound without sounding compressed.