Waves L1 Ultramaximizer limiter plug-in: features and spec-based rating

Waves’ L1 Ultramaximizer is a look-ahead peak limiter from Waves. It has true-peak limiting, auto release, and IDR dither with noise shaping.

A limiter raises the overall volume of a song while preventing clipping (distortion). You use it at the last stage of finishing a song.

In this article we compare L1 Ultramaximizer with 13 limiter plug-ins and rate how well it serves its purpose on three criteria. The basis is official manufacturer information.

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Summary

Among the 13 limiter plug-ins, L1 Ultramaximizer is rank C. The ranks run S, A, B and C, and C is the lowest. Averaging the scores for each criterion (out of 5, with the one criterion that matters most for the purpose counted double) gives 2.5.

Things to keep in mind

• Speed (2 points): you have to decide the settings yourself.
• Choice of sound character (2 points): the range of sound characters to choose from is narrow.

Who it suits: people who want to raise the volume quickly with few knobs.

Main features of L1 Ultramaximizer

A classic Waves limiter

The L1 is a Waves limiter that has long been used to hold down peaks, change the character of instrument sounds and make loud masters. The sales page explains that it reduces distortion with a fast reaction with no overshoot.

True peak and look-ahead

True-peak limiting prevents the clipping between samples (intersample clipping). This also makes it easier to match the standards of streaming services. Thanks to look-ahead, the attack is said to act instantly.

Dither and noise shaping

It has several dithers, including IDR dither, and noise shaping, which keep the fineness of the sound when you export at a lower bit depth. Latency is low, so it can also be used for live processing. The content of this article was confirmed on the product page of the retailer, Plugin Boutique.

Where it is useful

• Inserting it at the end of a two-track mix, setting the ceiling and raising the volume
• Applying dither when exporting to 16 bits
• Lightly holding down only the peaks on a drum bus

Rating by criterion

Raising volume safely: 3 / 5

We check whether it has features that prevent clipping and match the loudness standards of streaming services.

True-peak limiting reduces overshoot between samples. It has no loudness measurement or oversampling.

Speed: 2 / 5

We check whether it has features that get you to a good setting quickly (automatic settings, easy-to-read meters and so on).

It has auto release, which adjusts the release automatically. It has no AI automatic setting and no function for comparing at matched volume.

If “speed” matters most to you, smart:limit and pure:limit (5 points) are a better fit.

Choice of sound character: 2 / 5

We check whether you can choose the character of the sound when raising the volume (keeping the punch, keeping it transparent and so on).

There is one type of limiter.

If “choice of sound character” matters most to you, Pro-L 2 (5 points) is a better fit.

How we score (Limiter plug-ins)

Criterion	Basis	5 pt	4 pt	3 pt	2 pt	1 pt
Raising volume safely	Features that prevent clipping and match the loudness standards of streaming services	True-peak limiting, loudness metering and oversampling are all included	Two of those	One of those	—	Not mentioned on the official page
Speed	How quickly you can reach a good setting	AI analyzes the song and sets everything automatically	—	Presets, or a function for comparing at matched loudness	Standard controls	—
Choice of sound character	The range of ways the limiter can act and shape the sound	Choose from eight or more algorithms	Besides a choice of styles, features that shape loudness feel or attack	A choice of styles	One type	—

Each criterion is scored from 1 to 5 on how well the product serves one goal: safely finishing a song at a volume suited to streaming. Scores follow the conditions in the table above, and the rank is based on an average in which "Raising volume safely" counts double. The basis is official manufacturer information. Sound quality and CPU load are not measured, so they are not scored; reviews from trade magazines are introduced in the articles for reference. Price is not part of the score. Features that cannot be confirmed from the manufacturer's or a retailer's description are scored as if absent. The "OBS (streaming)" column in the table shows whether the official page lists the VST2 format that the streaming software OBS Studio can use (○). OBS does not support the VST3 format. It is not part of the score.

L1 Ultramaximizer system requirements and getting started

Operating system	Windows 10 or later / Mac (macOS 12 to 15)
Plug-in formats	Windows: VST, AAX / Mac: VST, AU, AAX (as listed by the retailer)
Other	To use it in the streaming software OBS, go through Waves’ official StudioRack
OBS (streaming)	Works with conditions (via Waves’ official StudioRack)

Checked on the manufacturer’s official pages on October 17, 2026.

Compared with other limiter plug-ins

Click a heading to sort. On a phone, the table scrolls sideways.

Read next

• L2 Ultramaximizer: features and rating (rank C)
• FG-X 2: features and rating (rank C)
• Pro-L 2: features and rating (rank S)
• smart:limit: features and rating (rank S)