By Acustica Audio in collaboration with ( Acustica Audio )
MusicRadar Rating... MusicRadar Rating...OSX 32 Bit OSX 64 BitVST 32bit & 64bit / AU 32bit & 64bit   AAX64 AAX 32 bit & 64bit               ...MusicRadar Rating VST 32bit & 64bit  AAX64 AAX 32bit & 64bit.
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Amethyst Front Teaser


Amethyst2 is a new high performance channel-strip released by Acustica. We offer a plugin of the highest quality and excellence with a very affordable price! This is a complete and versatile plugin that can be enjoyed and used by anyone.
Amethyst is a collection of multiple sections; switchable PREAMPS , FILTER ,EQ and COMP.
We decided to offer top quality hardware modeling and versatlity, carefully choosing each component of the plug-in. After several tests, we opted for an EQ HOMEBREW section, thanks to the contribution of Stefano dall’Ora. We faithfully recreated the curves sampled from hardware built exclusively by Acustica and based on the circuit diagrams of vintage device. We  are fully satisfied and quite delighted witht he results!
We implemented an alternative skin system that carefully reproduce the design of each module of the plugin…
In this way we hope that we have been able to recreate the new/vintage look of emulated gears.

AMETHYST2 is a perfect choice for a high-quality channel-strip to enhance and massage your music!


Amethyst2 is based  on CORE8, the revolutionary upgraded multithreading technology by Acustica.
It is an optimization of Core7 in terms of high performance, it introduces new important  features ( FIR-IIR algorithmic sidechain and  predisposition for FIR-IIR clipper)  allows to optimize performance of  Acqua plug-ins.

Amethyst Front Teaser


Amethyst Front Teaser

Key Features


Amethyst Front Teaser

Amethyst Front Teaser

The FILTERS and EQ stages are virtually identical with those of the hardware, the traditional EQUALIZER curves are steep-sided, providing very powerful tools.
The PREAMPS section is characterized by a several choices of PREAMPS, each one with different tonal features.
The  COMPRESSOR is characterized by a  Classic Design, Performance and Reliability.
The inclusion of a Compressor module in this plug-in provides a much more flexible and complete device which retained all of the character and musicality of the original design while incorporating some exciting new features that belong to the sampled device.

This bundle contains:
  • Amethyst2 
  • Amethyst2  ZL(*)

(*) Zero Latency



•    OUTPUT GAIN knob controls plug-in output gain from -24 to +24

•    POWER button enables (lamp ON) or bypasses (lamp OFF) the plug-in

•    INPUT TRIM knob sets the input level from -24dB to +24dB, and is used to control the signal level inside the Eq, the output level is than automatically compensated by the same amount of gain. At the first execution of the plug-in, input is set to ensure that you feed an appropriate level from the first stage of your signal path to the final one.

•    INPUT – OUTPUT   STEREO METERS measure the input (LEFT position meter) and output (RIGHT position meter) levels of the plug-in.


The first processing stage is the preamp section,
This plug-in is made up of 3 different preamps switchable.
Possible preamps are:

The 9098 button enables  the 9098 preamp, this Pre is more clean and linear
The 2500 MIX button enables the 2500 MIX Preamp, it has more transient reproduction    , It’s  quite clean.
The 2500 BUS button actives  the 2500 BUS Preamp, it is characterized by a low distortion and harmonics are more stark. It is more colored than 9098 preamp.



Frequency ranges differ for the bands to accommodate maximum flexibility.
Available values are:

Low Band:  to 27Hz from 1000Hz
Low Mid Band:  to 27Hz from 1000Hz
High Mid Band: to 0.63KHz from 20KHz
High Band: to 0.63KHz from 20KHz

In addition For Low and High Bands there are two buttons that enable peak/shelf mode.


Gain control provides a  variable cut/boost range of -12dB/+12dB for each band


The Q knob controls the sharpness of the peak or dip for each band, with a counter-clockwise detent for shelving on the LOW and HIGH bands;
The Q range values are different for band;

LF – HF:  from 0.2 to 1.7  
LMF – HMF:  from 0.4 to 3.5  



Each filter is independently from the others
•     HP1 button:  this HIGH-PASS 1 filter passes frequencies above its cutoff frequency and attenuates frequencies below its cutoff frequency.
The range is  27 Hz to 1000 Hz.
•     HP2 button: this HIGH-PASS 2 filter is activated pressing the appropriate button HP2.
The cutoff frequency of HP2 is fixed at 80Hz.
•    LP1 button: this LOW-PASS 1  filter passes frequencies above its cutoff frequency and attenuates frequencies below its cutoff frequency.
The range is  60 Hz to 240 Hz.
•    LP2 button: this LOW-PASS 2 filter is activated pressing the appropriate button LP2.
The cutoff frequency of LP2 is fixed at 10KHz.


•    COMP IN BUTTON pushing this button the Compressor is activated
•    INSANE BUTTON This mode allows you to increase the accuracy and speed of the compressor but it’s more expensive (in terms of CPU usage)
The “Hard Knee” button selects a shape to the compression curve. When not selected, compression begins gradually as the signal exceeds the threshold. It only reaches the set ratio several dB above the threshold. Selecting Hard Knee makes the change less gradual.

•    GAIN REDUCTION METER measures the reduction level applied by compressor, the meter indicates '0' in the absence of an input signal or any gain reduction. If the signal exceeds the compression threshold or limit level, the amount of gain reduction is displayed.
•    THRESHOLD: This knob set the threshold of the compressor from -30dB to a minimum of -18dB;
•    RATIO: This knob set the compression ratio, available values range from 1:2:1 to 16:1;
•    ATTACK: This knob set compressor's attack time that range from 0.3 ms (fast) to 300 ms (slow);
•    RELEASE: This knob set compressor's release time that range from 0.1 ms (fast) to 10 ms (slow);
•    MAKEUP: this knob sets the gain compensation and is designed to boost the compressed signal in order to match the level of uncompressed signal.

Sampling rate

  • 44,1 kHz
  • 48 kHz
  • 88,2 kHz
  • 96 kHz






Sys Requirements

OSX 32 Bit OSX 64 Bit

Operating System Windows7 Windows10 OS X 10.8 OS X 10.10
CPU Dual Core Latest multicore CPU (1) Dual Core Latest multicore CPU (1)
RAM 4 Gb 16 GB to 128 GB 4 GB 16 GB to 128 GB
HDD/SDD 1000 Mb 1000 Mb 1000 Mb 1000 Mb
Screen Resolution 1024x768 (XGA) 1920×1080 (HDTV) (2) 1024x768 (XGA) 1920×1080 (HDTV) (2)
Audio Host VST2/AAX 32 bits VST2/AAX 64 bits VST/AU/AAX 32 bits
VST/AU/AAX 64 bits

(1) Intel Xeon v3 or Intel i7 generation 4 or 6 or newer is recommended.
(2) 3840x2160 UHDTV is also supported.

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