---
title: "Adjust the 10-band equalizer deliberately · Sound Boost"
description: "Bass, mids, treble and preamp in the Sound Boost Plus mixer: small changes, neutral comparisons and gain reserve."
url: https://soundboost.impulse-apps.de/en/guides/understand-the-equalizer/
language: en
website: Sound Boost
publisher: Impulse Apps
---

Understand the Plus mixer

# Adjust the 10-band equalizer deliberately

An equalizer changes individual frequency ranges. It helps adapt the sound to the source and output device; it does not repair a recording or automatically enhance speech.

By Impulse Apps · Content reviewed on 7 October 2026

## Ten ranges from bass to treble

The Plus mixer has bands at 31, 62, 125, 250 and 500 Hz, then 1, 2, 4, 8 and 16 kHz. Each can be adjusted from −12 to +12 dB. Low bands affect bass, middle bands affect many voice and instrument components, and high bands affect brightness and sibilance.

Preamp changes the level before further processing. Automatic headroom accounts for the largest band boost, but does not guarantee that every combination remains free of peaks.

## Start with small adjustments

1. Begin with neutral EQ and a familiar section.
2. Adjust just one band slightly and listen to whether it supports your goal.
3. Reduce distracting ranges before strongly boosting several others.
4. Compare against the neutral setting and check the overall output. Use Reset if you want to begin again.

## Sound controls belong to Plus

EQ, sound profiles, preamp, balance and mono are protected Plus features. Sales remain disabled. An invalid subscription entitlement neutralises EQ; a local preset does not bypass this check.

## A worked example

A voice is muffled, but high gain only makes it louder. With an existing Plus entitlement, a small EQ comparison may help: start with Flat, then Voice or one band adjustment. The ten bands range from 31 to 16,000 Hz and are bounded at −12 to +12 dB. These are control ranges, not a universal recommendation. Test intelligibility with the same passage and note whether the change makes sibilance unpleasant.

Add your observations. This template processes no files and sends no report.

### Check the result

### If something is wrong

**Observation and next step**

| Observation | Next step |
| --- | --- |
| Bands have no effect | Check mixer activation and actual entitlement. |
| Sound becomes quieter | EQ headroom accounts for the largest boost; do not immediately compensate with maximum gain. |
| Many bands at maximum | Return to Flat and test one targeted change. |

## Common questions

**Is there one correct EQ curve?**

No. Sources, headphones, speakers and purposes differ. Judge small changes by the actual sound.

**Does EQ reliably remove noise?**

EQ affects frequencies, including wanted signal components. It is not a guaranteed noise removal or restoration service.

Browser activation and a Plus entitlement are separate requirements. Protected content and specialised players can have their own limitations.

[Help and contact](https://soundboost.impulse-apps.de/en/support/)

## Continue here

[Start and volume](https://soundboost.impulse-apps.de/en/guides/output-protection/)

### Compressor, headroom and output protection

Understand Sound Boost’s shared output protection and why a limited peak does not mean a repaired source.

**Read the guide**

[Understand the Plus mixer](https://soundboost.impulse-apps.de/en/guides/balance-and-mono/)

### Use balance and mono in the Plus mixer

Understand left and right channels, test balance and deliberately listen to stereo in mono.

**Read the guide**

[Start and volume](https://soundboost.impulse-apps.de/en/guides/presets-and-reset/)

### Choose presets and return to a baseline

Distinguish free volume presets from Plus sound profiles and compare changes clearly.

**Read the guide**