Dual operating levels brings additional flexibility in modern DAW recording studio situations.


RM 58 History The RM 57 and RM 58 Stereo Limiters are highly regarded by many leading producers as a Holy Grail piece of vintage analogue equipment and were manufactured in New York by Roger Mayer Electronics Inc.

They have a 50 year studio history and continuous heritage of being used on many hit records since their introduction.
From Olympic studios in London famous for the Rolling Stones recordings and of course Jimi Hendrix's iconic "Axis Bold as Love" to New York's Record Plant, Electric Lady, Atlantic Records, Columbia Records, Hit Factory, Media Sound, Elektra Records, Vanguard Records, Mayfair Studios, A&R Studios the unique and musical properties of the RM 57 and 58 became a go to choice for producers who needed an alternative more dynamic sounding limiter than the traditional radio station type of limiter that were currently used.

Other recording studios quickly followed both in the USA, England and Europe and the sound of the RM 57 and 58 can heard on the tracks from these famous studios who were responsible for many legendary iconic recordings of so many famous artists: Jimi Hendrix, Stevie Wonder, Led Zeppelin, Aerosmith, John Lennon, to name a few. Leading mastering studios also used RM Limiters and Atlantic Records, Record Plant; Elektra Records had custom versions made. So it would be accurate to say that you are already familiar with their sound in action.

Recording Console RM 58 versions were integrated into our Custom Recording Desks and also in a Custom Film RM Location Mixer for Rolf Pardula contained a RM 58 Stereo Limiter used for main primary dialogue capture on many Hollywood major film releases.
Rolf also went on to win an Emmy for TV series sound recording using his custom RM location recording mixer.
Fred Weinberg Productions went on to win multiple Clio Awards for TV Advertising Music using both a custom RM Console and RM 58 limiters.

Our unique proprietary FET gain reduction circuit uses input information in a feed forward manner to control both positive and negative peaks. This dynamically controlled gain reduction method enables the stereo center image to be maintained when using significant amounts of gain reduction instantly making it suitable and popular for vinyl mastering applications. Operationally It is almost the opposite to the old type of limiter where information is integrated over a period of time and then applied to control gain.

We do not specify limiting ratios because with our dynamic gain reduction occurring in real time it is always changing to make it very natural and musical sounding. The wide range of Attack and Release times parameters available enable many difficult recording scenarios to be recorded perfectly.

The closely dynamically matching of our 57 or 58 limiters is crucial to enable successful Master 2 Track Bus application tasks. Individual superb performance on Bass Guitars, Vocals, Drums. Strings and Brass for initial tracking etc also benefit from this dynamic matching.
The audio circuit path is all Class A low noise advanced discrete design only using the best available components. The resulting Class A circuit path provides the ultimate audio transparency with an extended frequency response to 100 KHz. The output is also Class A - ultra low output impedance.
Technically the design is very advanced and today its unique pioneering performance still stands out and compares very favourably to other later designs. Upon listening it is immediately obvious that it is significantly more open and dynamic sounding than any of the old type of traditional Radio Station Type of Limiters you may have heard.
So take time out to listen to a truly unique important piece of legacy audio equipment we produce today with an impeccable heritage and history to hear and:

"experience the difference"

RM 58 1970 Model


The latest evolution of the Mono RM 58 retains the same Class A audio circuit path and the FET gain reduction method. The new housing can be used on a desk or floor and is convenient to use in modern recording or performance situations. The overall performance has also been improved and both professional +4dBV and semi-pro -10dBV operating levels are catered for. These new improvements allow the RM 58 to be used in new situations where a rack mounted unit would not be a good choice.


Digital Friendly:

The use of a good limiter to control peaks effectively in real time before you go into the digital domain is the best way forward to record a great sound. Using limiter plug-ins after the fact will simply not do the job as the peaks have already been recorded. This means that the main part of the sound does not have as much resolution or bandwidth as may be possible to give the best sound. The updated RM 58 has been designed to perform this new task with ease and bring a new dimension to digital recordings.


This has been increased to interface with professional digital recording systems.

Gain Reduction Meter:

An illuminated backwards reading large VU meter both shows Gain Reduction and the effect of the Attack and Release time constants on the amount of gain reduction. The gain reduction is measured using an identical side chain as the audio path thus ensuring accuracy.

Switched Attack and Release Time Controls:

The 6 position controls have been optimised to give a very useful range of control that can be recalled with ease.

Dual Operation Modes:

+4dBV and -10dBV modes are accessed through two sets of sockets.

Instrument Friendly:

The -10dBV mode input is high impedance that enables a guitar or other instrument to be plugged straight into the RM 58 without the need for a buffer. It will not tone suck the pickups and is very quiet and transparent. The -10dBV output will interface correctly with an amplifier or an input to a recording device. This extends the use to live shows using the RM 58 into an amplifier or to the PA system. You can use the +4dBV output to interface the instrument with a professional level recording studio recording system.

Bypass Switch:

This enables the RM 58 to be switched in an out to assess the limiting effect or bypass the unit. The status of the unit is indicated via an LED.

Power Supply:

There are no mains transformers in the unit to provide a source of hum. The unit is powered from a Regulated AC / DC Switching Adaptor. Input 100-240V , Output 48V 0.3A. The input voltage is further regulated and filtered onboard for the best possible noise free performance.


220 x 145 x 58mm
Weight: 1420g