Applied Computer Music Technologies Ltd | ACM-3SA - Passive Filter Plug-In for Linux

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The ACM-3SA passive filter VST plug-in for Windows and Linux

Product Activation

Download for free. Every 60 seconds the plug-in will fade to silence momentarily. To remove this limitation you will need to use the free activation code provided in the download.

Open the plug-in in your host application and click the lock button at the top left of the plug-in to open the license entry dialogue. Type (or paste) your product activation code into the text box. You will then need to restart your host application to complete the process.

Overview

A versatile low and high-cut filter plug-in combined with an intuitive, modern stylized user interface.

Inspired by the vintage Pultec HLF-3C passive filter, the ACM-3SA perfectly complements the ACM-2SA Vintage Program EQ and ACM-5SA Vintage Mid-Range EQ. Emulating 12dB / octave low and high-cut passive filters, the ACM-3SA combines high-performance processing with an intuitive stylized user interface. A versatile general purpose filter suitable for removing rumble, hiss, and hum with the minimum loss of content.

Easy to install.
Smooth switching between filter settings.
Physically modelled rotary control modes.
Resizable graphical user interface.
12dB / octave low-cut (high-pass) filter.
12dB / octave high-cut (low-pass) filter.
Innovative processing accurately models the analogue frequency response - without additional latency or high CPU demand, even at lower sample rates.
VST, VST3, JACK and CLAP plug-in for Windows & Linux.

System Requirements - Windows

64bit Windows 7 or newer.
A compatible host application with VST2, VST3 or CLAP plug-in support.

System Requirements - Linux

Linux x86-64/AMD64 64bit e.g. Ubuntu 20.04 LTS or newer.
An X11 or XWayland compatible host application with Linux VST2, VST3 or CLAP plug-in support.

Disclaimer: All trademarks are the property of their respective owners and are used for information purposes only. References to other companies or their products or representation of those products does not imply any official endorsement of the software by those companies or any affiliation to those companies unless expressly stated otherwise.

	Latest Version
•	VST2 64bit	V3.2.0
•	VST3 64bit	V3.2.0
•	CLAP 64bit	V3.2.0
•	JACK 64bit	V3.2.0
	Features
•	Low-frequency cut filter	'Constant-K' high-pass filter switchable to 50Hz, 80Hz, 150Hz, 250Hz, 500Hz, 750Hz, 1kHz, 1.5kHz or 2kHz.
•	High-frequency cut filter	'Constant-K' low-pass filter, switchable to 1.5kHz, 2kHz, 3kHz, 4kHz, 5kHz, 6kHz, 8kHz, 10kHz, 12kHz and 15kHz.
•	Physical Control Modelling	Replicates the 'feel' as well as the look of high quality rotary controls.
•	Passive Filters	Passive filter emulation maintains the smooth frequency response of classic vintage designs.
•	Analogue Filter Modelling	Analogue filter modelling algorithms recreate natural analogue filter curves, even at lower sample rates, without additional latency or high CPU demand, allowing more plugin instances in a typical digital audio workstation project.

OS / System Compatibility

	32bit	64bit
Windows VST2		✓
Windows VST3		✓
Windows CLAP		✓
Linux VST2*		✓
Linux VST3*		✓
Linux CLAP*		✓
Linux JACK*		✓

OS / System requirements based on typical representative configurations and host applications. Be sure to check compatibility with the free demos provided.

*Linux compatibility is dependent upon operating system components, configuration and host application(s). Please check compatibility using the free demo.

ACM-3SA Product Operating Guide

Access to plug-in parameters is provided by a fully resizable graphical user interface. Your host application may also provide access to parameter adjustments and additional configuration.

Front panel of the ACM-3SA passive filter plug-in for Windows and Linux

Graphical User Interface

The plug-in settings are adjusted by clicking and dragging on the rotary controls or buttons. Some controls may have detents – these manifest themselves as areas in the rotation where the reluctance to move is increased such that you have to drag them a bit harder. They are intended to behave similarly to real controls which may have a 'click stop' at 0dB for example.

You can also adjust the controls by placing the mouse pointer over them and using the scroll wheel. In this case the detent has no effect.

Control Modes

The control mode determines the way in which the rotary controls respond to mouse movement. This can normally be configured via the host application preferences. Please refer to your host application documentation for details.

Circular. In this mode, clicking on a control will move it immediately to the mouse pointer’s angular position. To adjust the control, drag the mouse pointer in a circle or an arc.
Relative Circular (Default). This is the default mode unless changed by host application settings. Similar to circular mode, however moving the mouse will adjust the control relative to its current setting.
Linear. In this mode, the control responds to vertical mouse movement. Drag up to increase the value, turning the control clockwise, or down to decrease the value, turning the control anticlockwise.

In all modes, double clicking the centre of a control will return it to its default position.

Control Functions

1. EQ In

This is the EQ filter bypass switch. With the switch on, the filters will be in the signal path and affecting the output. With the switch off, the filters will be out of the signal path.

2. Low Cut Frequency

The low-cut switch selects the cut-off frequency at which the low-cut filter operates. The switch has ten frequency positions together with an ‘off’ position which bypasses the low-cut filter completely. In keeping with similar vintage hardware, the control settings are indicated in cycles per second (CPS) - equivalent to Hz.

3. High Cut Frequency

The high-cut switch selects the cut-off frequency at which the high-cut filter operates. The switch has ten frequency positions together with an ‘off’ position which bypasses the high-cut filter completely. In keeping with similar vintage hardware, the control settings are indicated in kilocycles per second (KCS) - equivalent to kHz.

Disclaimer: All trademarks are the property of their respective owners and are used for information purposes only. References to other companies or their products or representation of those products does not imply any official endorsement of the software by those companies or any affiliation to those companies unless expressly stated otherwise.

Front panel of the ACM-3SA passive filter VST plug-in for Windows and Linux

ACM-3SA Passive Filter Plug-In

ACM-3SA Technical Specification:

Product Specifications

Windows & Linux VST, VST3, and CLAP compatible.
Mono or stereo operation.
Smooth switching between filter settings.
-18dBFS reference level for 0dBu.
Low Cut - 50Hz - 2000Hz 12dB / octave.
High Cut - 1.5kHz - 15kHz 12dB / octave.
Filter types:
- 'Constant-k' low frequency cut filter.
- 'Constant-k' high frequency cut filter.
Filter frequency ranges:
- Low Cut: 50Hz, 80Hz, 100Hz, 150Hz, 250Hz, 500Hz, 750Hz, 1000Hz, 1500Hz and 2000Hz.
- High Cut: 1.5kHz, 2kHz, 3kHz, 4kHz, 5kHz, 6kHz, 8kHz, 10kHz, 12kHz and 15kHz.
Polarity invert switch.
Output level trim (+/-6dB).

Please note: In the interest of continual product improvement, specifications may be subject to change without notice.

Disclaimer: All trademarks are the property of their respective owners and are used for information purposes only. References to other companies or their products or representation of those products does not imply any official endorsement of the software by those companies or any affiliation to those companies unless expressly stated otherwise.

ACM-3SA Passive Filter Plug-In

ACM-3SA Download for Free

1. System Requirements - Windows

64bit Windows 7 or newer.
A VST, VST3 or CLAP compatible host application.

2. System Requirements - Linux

Linux x86-64/AMD64 64bit e.g. Ubuntu 20.04 LTS or newer.
A Linux VST, VST3 or CLAP compatible host application.

3. Product Activation

Every 60 seconds the plug-in will fade to silence momentarily. To remove this limitation you will need to use the free product activation code provided in the download.
Open the plug-in in your host application and click the lock button at the top left of the plug-in GUI to open the license entry dialogue. Type (or paste) your product activation code into the text box. You will then need to restart your host application to complete the process.

4. Product Support

All downloads include their own installer, manual, and installation instructions. Easy to install with just a few clicks.
If you need help downloading or installing the software please use our contact form to let us know.

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ACMT - Applied Computer Music Technologies Ltd

Professional Audio Software and Plug-Ins

ACM-3SA Passive Filter - VST Plug-In for Windows & Linux