Brainworx Mixing Month Plugin Sale (1): Shadow Hills Mastering Compressor (~3/31, $31.90)

Hey there! I’m Jooyoung Kim, an engineer and music producer.

This month, Plugin Boutique is holding a sale on six Brainworx plugins, and they’re all worth checking out—so I thought I’d share them with you!

Here’s the lineup of plugins on sale:

1. Shadow Hills Mastering Compressor – Compressor
2. Shadow Hills Mastering Compressor Class A – Compressor
3. Black Box Analog Design HG-2 – Saturator
4. Black Box Analog Design HG-2MS – Saturator
5. Mäag Audio EQ4 – EQ
6. SPL Transient Designer Plus – Transient Shaper

I originally bought and have been using plugins 1, 3, and 5 myself. For 2, 4, and 6, I requested NFR (Not for Resale) licenses from Brainworx through Plugin Boutique.

In this post, I’ll focus on introducing the Shadow Hills Mastering Compressor and its Class A version.

If you purchase through the links in this blog, I’ll earn a small commission, which really helps me keep doing what I love—so thank you in advance! ^^

Let’s dive in!

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1) Shadow Hills Mastering Compressor

Tame your dynamics with tremendous tone and precise control. Made by Brainworx, this is the supreme tycoon of master bus compression. Meticulously modeled after the instantly legendary hardware original, no details have been spared in crafting this digital version of one of the most musical and versatile compressors ever made.

This plugin is a faithful recreation of the famous Shadow Hills Mastering Compressor.

You’ve probably seen this pricey beast in mastering rooms. Back in the day, it cost around $10,000, but I hear it’s closer to $20,000 now—haha! Inside this compressor, you’ve got two flavors: an Opto compressor and a Discrete (VCA) compressor. Plus, it offers three output transformer options—Nickel, Iron, and Steel—for different tonal characters.

The Opto section uses a T4B cell, like the ones in the LA-2A or LA-3A, aiming to mimic that vibe. You can’t adjust the ratio, and it has a two-stage release (fast at first, slower later), much like the LA-2A.

The Discrete section is a VCA compressor with a bunch of tweakable parameters. They’re pretty straightforward once you look at them. For example, in the Ratio settings, “FLOOD” is around 20:1, and in Recovery, “Dual” means it follows a two-stage release like the Opto mode.

The transformer options are described in the manual like this (though I’d recommend checking frequency response and harmonic distortion tests too, with the compressors bypassed and just swapping transformers):

• Nickel: The cleanest option with the least distortion. It subtly emphasizes ultra-high frequencies.

• Iron: Adds a Class-A amplifier section for even-order harmonic distortion and a super musical low-end boost.

• Steel: The most distorted option, delivering an ultra-tight low-end boost. Personally, I’m a fan of Steel—haha!

The Opto side adds some harmonic distortion, while the Discrete side is cleaner—both in Plugin Doctor measurements and by ear.

When I use this plugin, I tend to turn off the Opto and stick to the Discrete settings. It just feels cleaner that way, which suits my taste—I love crisp, clear sounds. The Class A version (up next) feels the same way to me… haha!

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2) Shadow Hills Mastering Compressor Class A

An even smoother-sounding version of the elite mastering compressor. Made by Brainworx, this upgrade to one of the most prestigious hardware compressors of today is enhanced with patented TMT modeling. The Shadow Hills Mastering Compressor Class A Limited Edition is one of the rarest and most powerful high-end compressors out there.

This one’s a plugin recreation of the Class A VK hardware—a limited-edition model from 2012, made in collaboration with Vintage King, with only 50 units ever produced.

Here’s what sets it apart:

1. The VCA compressor’s amplification stage is entirely Class A.
2. It uses a Lundahl input transformer, known for its clarity.
3. The internal wiring is handcrafted with Mogami cables.
4. It swaps the standard LEDs for red ones (a small but cool difference!).

Testing this out, I realized something: I own the regular Shadow Hills Mastering Compressor but rarely use it. The Class A version, though? The Discrete mode really clicked with me—I’ll definitely be reaching for it more often. The sound is just so clean and polished.

The workflow is the same as the original Shadow Hills Mastering Compressor, but the frequency response differs a bit.

[Photo: Opto, Discrete bypassed, frequency response followed by Nickel, Iron, Steel]

When using the Opto mode, the frequency response shows it cuts quite a bit of the high end. I’m a sucker for lively highs and ultra-highs, so it’s not my thing—but I know plenty of people who love that sound!

I wanted to show you the harmonic distortion too, but Plugin Doctor seems to glitch out and not display it properly… haha. Oh, and one more thing: in both the original and Class A versions, the Opto mode is Hard Knee, while Discrete is Soft Knee. Sometimes this shows up weirdly or doesn’t apply correctly—ugh, bugs!

Anyway, the Discrete section on this Class A version is fantastic. I’ve got it set to Steel and Discrete, and I’ll probably use that combo a lot. If you’re choosing between the original and this one, I’d recommend the Class A.

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Wrapping Up

When you buy from Plugin Boutique, you get a free plugin with your purchase. This month, it’s either Audiomodern Freezr or Heavyocity MicroFX Refiner—don’t forget to grab one!

That’s it for today. I’ll pick up with the rest of the plugins in my next post—stay tuned! ^^