McDSP ML4000 HD v6

SKU: 1075-24
$ 249.00 -20%
$ 199.00

The ML4000 is a high-resolution limiter and multi-band dynamics processor designed for music, mastering, post, and live sound.

The ML4000 is two plug-ins:

ML1 - Master Limiter

ML4 - Multi-band Gate, Expander, and Compressor fed into the ML1 mastering limiter The ML1 mastering limiter uses a flexible brick wall look-ahead design coupled with multiple stages of limiting for superior peak detection. The unique Knee and Mode controls allow the ML1 to handle any kind of material with a variety of responses ranging from transparent to aggressive.

The ML4 multi-band dynamics processor includes a 4-band Gate, Expander (upwards or downwards), and Compressor fed into the same limiter algorithm found in the ML1. Each band’s Gate, Expander, and Compressor can be configured separately or linked together. Steep 24 dB/Oct crossover filters minimize signal leakage into adjacent bands. Multiple real-time metering options in each band allow quick visualization of all signal dynamics.

The ML4 crossover page shows the overall frequency response in real-time of the input, output, or total dynamics effect, on top of the graphically adjustable crossover frequencies.

Accurate output adjustment is fast and simple with output ceiling control, large meters, and meter level text readouts.

The ML4000 provides outstanding results with an intuitive user interface, flexible design, and powerful set of algorithms.


Brick wall look-ahead limiter

Multi-stage peak detection and limiting

Unique limiter Knee and Mode controls

Multi-band Gate, Expander (up/down), Compressor

Simultaneous display of Gate, Expander, and Compressor dynamic curves in every band

Multiple real-time metering options

Adjustable crossover filters

Multi-band control linking

Analog Saturation Modeling

Double precision processing

Low Latency

Mono and stereo versions


HD v6: AAX DSP/Native, AU, VST3

Native v6: AAX Native, AU, VST3


The most common use of the ML1 and ML4 is the increase of signal levels across the entire mix. The Output Ceiling control sets the maximum signal level, and the master Threshold control determines where signal level increases start. The Release, Knee, and Mode controls can setup the subjective sound of the limiter. The multi-band dynamics processor can be used to augment or correct the input signal and best prepare it for treatment by the mastering limiter.


While there is no EQ section in the ML4, the crossovers and the band output gains are the basic controls of a graphic EQ of sorts. The output levels of each band can be altered, and then are recombined in the mastering limiter section. Note too how using the limiter to set an output ceiling, the ‘EQ’ levels can be made to not cause overshoots in output levels.

Multi-Band Gating

The multi-band Gate in the ML4 can be used to remove background noise from instruments in close proximity to each other. A good example of this is the typical drum kit. The kick, snare, hi-hat, toms, etc. are all usually mic’ed separately, but signal from adjacent drums elements “leak” into each other’s tracks. A single-band gate is often used to only ‘open’ a track when signal from the desired drum element is actually being played. However, many drum elements have overlapping frequencies, and so the use of a multi-band gate can readily solve many problems previously unmanageable.



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