Can noise reduction fix a recording made in a bad room?

Not fully. Room reverb is already inside the signal, so processing can only shorten it, usually with aggressive gating that sounds worse than the reverb did. A soft room and a shorter mic distance fix the problem at the source.

What order should noise reduction, EQ and compression go in?

Start from the quietest input level that captures the performance, run noise reduction on the voice, cut rumble below roughly 80 Hz, and apply compression last. Compression raises the noise floor, so using it before reduction leaves you with more noise to remove.

Why does my denoised voice sound underwater?

Reduction was set too high. Pushing until the hiss disappears completely also removes speech that resembles the noise, which is what smears consonants and flattens the voice. Back the strength off until the noise is inaudible but the voice stays natural.

Can noise reduction fix clipping?

No. A clipped recording is flat-topped at the peaks and the information is gone. Record at a lower input level; no effect chain can reconstruct a waveform that was never captured.

How to Denoise a Recording on iPhone

The short answer

Noise reduction is an effect, not a repair. It estimates what the unwanted sound looks like and subtracts it. Applied at the right strength to a recording where the noise is steady and the voice is loud, it works well. Applied to a recording where the noise is louder than the voice, it cannot recover the voice — it can only make everything quieter and more artificial.

What counts as "noise" here

Most people asking this are fighting one of four things, and they need different fixes:

Steady hum or hiss — mains hum, air conditioning, a laptop fan, preamp noise floor. This is the ideal case for noise reduction, because the noise is unchanging and can be learned.

Room reverb — the echo of a voice in a reflective space. Partially fixable. Heavy gating can shorter a room to a booth; it cannot recover detail the room already destroyed.

Handling and mouth noise — pops, plosives, chair creaks, breath. These are transient and unpredictable, so broadband reduction handles them poorly. They need targeted editing.

Distortion already baked in — a recording pushed so hard it clipped. Nothing can fix this. The waveform is flat-topped and the information is gone.

The order that works

Doing these out of order is the most common reason noise reduction sounds bad.

Clip and gain first. If the take was recorded hot and distorted, no amount of processing helps. Start from the quietest input level that still captures the performance.
Noise reduction on the voice track. Let the tool learn a few seconds of room tone — the silence between phrases — before it processes the take.
EQ to remove rumble. Cut below roughly 80 Hz for voice, which is where handling noise, HVAC and building rumble live. Do this before or alongside reduction, not after.
Compression last. Compression raises the noise floor along with the voice. Applying it before reduction means you have more noise to remove.

Setting the strength

Set noise reduction until you stop hearing the noise, then back off a little. The instinct to push until the hiss disappears completely produces the artifact everyone recognizes: a voice that sounds underwater, with the consonants smeared.

Strong reduction also removes the parts of speech that happen to resemble the noise — the "s" and "f" sounds, the tail of a "t". That is why "completely clean" and "natural" are different goals, and why the strength dial matters more than the algorithm.

When to record again instead

If the room is the problem, no effect chain fixes it. A recording made in a reflective space sounds bad even after perfect processing, because the reverb is in the signal. Shortening it with aggressive gating makes it sound worse, not better.

Practical changes that beat any plugin:

Record somewhere with soft surfaces — a bed, curtains, a wardrobe full of clothes
Put the phone 15–20 cm from your mouth rather than at arm's length
Avoid a bare wall directly behind you, which reflects the hardest
Record in a quieter time of day if the noise is external

Working with video

If the audio came from video, the same chain applies, but start by extracting the audio as its own track first — it gives you the control you would not have working inside a video timeline. WaveCraft will pull a clean audio track out of a video file so you can denoise it as a proper audio project.