Audified U73b Compressor

Tube Compressor Plugin

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  • Regular price
    $69.00
    USD
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    For detailed instructions on the registration/download process, you can visit our dedicated page by clicking here: Install Instructions.

Education Proof

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Types of proof

Student

Student ID Card, Letter of enrollment, or similar

Teacher/Lecturer

Teacher ID Card, Lecturer ID Card, Payslip, Letter from the school/college

Education proof is submitted to the manufacturer and is accepted at their discretion.


The Basics

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It has 3 types of activations, iLok USB, iLok Machine, and iLok Cloud.

Different brands/products will offer different iLok methods. iLok USB is always an option, but the availability of iLok Cloud and iLok Machine methods is at the discretion of the software developer.


iLok Account

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iLok License Manager

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iLok USB Key

iLok USB

This activation is stored on an iLok 2 or 3 USB key.

It is the best option for portability, if you frequently move between multiple machines, and offline use.


iLok Machine ID

Machine ID

This activation is stored locally on your computer.

While this is a convenient way to work offline, and does not require the additional cost of an iLok USB, there is the risk of a license being lost in the case of a drive failure.

This option also requires extra care when you upgrade to a new computer, the license(s) must be deactivated on your old machine first to ensure you do not lose them.


iLok Cloud

iLok Cloud

This activation is based online, and requires a "cloud session" using the iLok License Manager.

It requires an active internet connection for the entire time you use the plugin(s).


Faithful emulation of the German broadcast compressor/limiter unit U73b. 2nd generation of the famous plug-in.

The quality and uniqueness of its sound and the inaccessibility of the original device makes U73b Compressor plug-in hitting the top ranks of the producers' wish lists.


  • Award-winning plug-in
  • Precise valve circuit model
  • Faithful tube sound
  • External side-chain
  • Auto Output parameter
  • Oversampling

The device was often used for mastering between 1960 and 1980. It is an all-tube vary-mu compressor/limiter with adjustable release time option. We kept the circuit exactly as it was originally designed and only added input and output gain (before and right after compressor circuit) to help with proper adjustment of the compression. The plugin effect has been also supplemented with a VU meter and selectable side-chaining.


There are many models of vintage compressors around. The sound and control of the original devices with legendary brand names from one era and one region were great, so it is good to have the originals or software models in your studio. But there is quite a significant number of famous recordings where a different gear was used.


The glory of U73b appeared simultaneously with the glory of the first very famous rock bands. Most of them recorded in Europe and although some studios used American compressors, a significant number of the recording used U73b or very similar products. U73b may bring not only some required diversity to your recordings, but it also brings the sound tied with the golden era of rock music in Europe.


  • Compressor/Limiter switch – is the upper U73b knob and it switches between Compressor mode (Kompr), Bypass (Durchschalt) and Limiter mode (Begr). The compressor mode has a lower threshold setting and very gentle increasing ratio, in opposite, the limiter mode provides a higher threshold setting with a higher ratio but still with the smooth knee.
  • Release time – the first three positions offer fixed release time, the other three positions (marked red) provide adjustable program content-dependent release time option.
  • IN – adjust input gain before the compressor/limiter circuit
  • OUT – adjust output gain after the compressor/limiter circuit.
  • Key input – selects the signal source used for controlling the gain reduction
  • HPF – U73b is a vintage device and as such, it may not meet present mastering demands. We added a bass management button that simply switches between original sound and desired modern sound (without low frequencies bypass).

System Requirements

  • MacOS 10.11 El Capitan and above
  • Windows 7 and above (64-bit only)
  • Intel, AMD, or Apple Silicon CPU

Plugin Formats

AAX Native, AU, VST2, VST3

Crossgrade Proof

This crossgrade is for owners of a competing DAW. To prove your DAW ownership, we require that you upload proof in the form of an image/PDF.


Types of proof

A copy of your purchase receipt for the original license or the most recent update/upgrade

A screenshot of your product registration

A photo of your package (either CD/DVD or printed manual), with the unique serial number included in the photo.