UAD Shadow Hills Mastering Compressor is a plug-in recreation of a high-end mastering compressor whose hardware version cost over ¥1 million at the time of this article. It combines optical and VCA compression in two stages, with three selectable output transformers—NICKEL, STEEL, and IRON—to add the distinctive character of vintage analog equipment. Beyond mastering, it can be used on vocals, drum buses, and many other sources. Its main appeal is natural, pleasing compression that brings both a sense of loudness and depth.
Faithfully Recreating the Sound of a Premium Compressor

In this fourth installment of our series exploring the appeal of UAD, we take a look at Shadow Hills Mastering Compressor, or SHMC for short.
As its name suggests, this is a plug-in version of Shadow Hills’ mastering compressor.
The hardware cost over ¥1 million at the time of this article, so it is not something you encounter every day. However, it has a reputation for performance and sound quality worthy of that price.
The plug-in attracted attention because UAD recreated the hardware through meticulous modeling.
First, listen to the following examples to hear how it changes the sound when applied to the master bus.

- Before SHMC
- After SHMC
What do you think?
It adds just the right amount of analog flavor, increasing the sense of loudness while also creating a feeling of depth and spaciousness.
It really feels like a mastering tool, with a distinctive character that is difficult to replace.
Exploring UAD Shadow Hills Mastering Compressor
Recommended Hardware for Running UAD Plug-ins
Frequently Asked Questions
Q1. Is Shadow Hills Mastering Compressor only for mastering?
No. Although its name refers to mastering, it can also be used on vocals, drum buses, and many other sources. The optical stage provides natural compression that works well on vocals, while more assertive settings on the VCA stage can reshape a drum sound.
Q2. What is the difference between the optical and VCA stages?
The optical stage in this plug-in has no attack or release controls, offering simple operation and natural compression. The VCA stage provides detailed controls such as attack, release, and ratio, making it suitable for more precise dynamic control. One advantage of this compressor is that you can use both stages in series.
Q3. How should I choose between NICKEL, STEEL, and IRON?
NICKEL has the least distortion and adds a subtle accent to the extreme high end. IRON mainly emphasizes the low end, while STEEL offers the strongest analog character with a tight low-end boost. Choose the transformer that best suits the sound character you want.
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