Why did the boost clip only some samples?

Because clipping depends on the peak, not on the average. A file can sit mostly well below full scale and still have a few loud transients near the ceiling; those are the samples that run out of range first. The count tells you how many, which is a good guide to how much smaller the boost needs to be.

Is six decibels really twice as loud?

Six decibels is twice the amplitude, which is a real and measurable doubling of the waveform. Perceived loudness roughly doubles nearer ten decibels, because the ear responds to level logarithmically, which is why the presets step the way they do and why a small-looking change can be very audible.

Does amplifying change the tone?

Multiplying by a constant does not alter the frequency content at all, so an unclipped boost is tonally transparent. Clipping does change the tone, because a flattened peak introduces harmonics that were not present in the source.

How do I make a file louder without clipping it?

Raise the average rather than the peak. A limiter or the volume booster catches transient peaks while the rest of the material comes up, and a compressor run beforehand reduces the distance between loud and quiet, which is what the extra level has to fit into.

Can I reduce the level with a negative value?

The slider runs from one to twenty four decibels upward, so it is a boost only. Reducing a level is exactly the same arithmetic with a multiplier below one, and the volume reducer offers it with the same clarity.

Audio Amplifier

You Might Also Need

Audio Normalizer

Normalize audio levels for consistency

Volume Booster

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Audio Limiter

Apply peak limiting to prevent clipping

Brickwall Limiter

Ultra-transparent peak limiting

Audio Amplifier multiplies a file by a gain you choose in decibels, and tells you exactly how many samples hit the ceiling along the way. It is the plainest way to make a quiet recording louder.

What is Audio Amplifier?

Set the gain, drop a file, and process. The footer reports the peak the file had before the change and, if anything ran out of range, the number of samples that were clipped.

The controls:

A gain slider from one to twenty four decibels, in one-decibel steps, defaulting to six.
Four presets at three, six, ten and twenty decibels for the usual cases.
A footer line giving the input peak both as a value and in decibels below full scale.
An explicit warning naming the number of samples that were clipped, or a confirmation that nothing was.

The gain is applied by converting decibels into a linear multiplier and scaling every sample by it. Decibels are a ratio, so six decibels doubles the amplitude and twenty decibels multiplies it by ten; the conversion is the standard power-of-ten relationship between the two scales. Because the multiplier is applied uniformly, the file's internal balance is untouched — the quiet parts get louder by exactly as much as the loud parts do, which is what separates this from a compressor. Anything that lands outside the valid range is clamped to the ceiling, and every sample that had to be clamped is counted. Clipping is a hard failure of a waveform rather than a gentle reduction: a peak that would have reached a third above full scale is instead flattened into a straight line, which adds harmonics that were not in the original and is heard as harshness rather than as extra level. That is the whole reason the count is reported. If it is zero, the boost was safe and the file is simply louder. If it is not, the answer is a smaller boost, a normalizer aimed at a safe target, or the volume booster, which uses a limiter so the peaks are controlled rather than squared off.

Where it is limited:

Only upward gain, so lowering a level is the volume reducer's job.
No dynamics, so loud and quiet passages stay the same distance apart.
Clipped samples are clamped rather than compressed, and the result is audible as harshness.
No metering beyond the input peak and the clip count.
One gain for the whole file and for every channel.
Output is sixteen bit WAV.

Use it when a recording is simply too quiet and a fixed lift is all that is needed: a field recording that came back low, a voice memo that sits far below the rest of a project, or a stem that needs to be brought up to match its neighbours. When the goal is a specific level rather than a specific increase, the normalizer aims at a target instead, and when the material has peaks that must not clip, the limiter and the volume booster control them while the gain is applied. Knowing the amount of headroom first is what makes the choice easy: a file whose peak is already close to full scale has nowhere for the boost to go, and a file that sits well below it can take a large one without a single sample reaching the ceiling.

How to use Audio Amplifier

Drop an audio file onto the panel; the duration appears once it decodes.
Set the gain with the slider or one of the four presets.
Press process and read the peak and the clip count in the footer.
If samples were clipped, lower the gain and run it again before downloading.

When to use Audio Amplifier vs related tools

Audio Amplifier is the straightforward gain stage, useful when the amount of lift is known and the material has headroom to take it. Audio Normalizer aims at a target level instead of adding a named amount, and Volume Booster applies gain behind a limiter so a quiet file can be lifted hard without squaring off its peaks. When the level must come down rather than up, Volume Reducer does that.

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