MK-609 is a bus compressor plugin from Kiive Audio, modeled after a 1969 bus compressor used in large-format consoles, with two independent channels and a built-in limiter.
MK-609 at a glance
| Developer | Kiive Audio |
|---|---|
| Type | Effects / Compressor |
| Formats | VST2, AU, AAX |
| Operating systems | Windows 7 or later, macOS 10.7 or later |
| Architecture | 64-bit |
| Price on Plugin Boutique (October 2026) | €145.73 |
What MK-609 does
Each of the two channels processes signal independently, so the plugin can be used on two separate sources or as a stereo bus, and a built-in limiter adds smooth transient control on drums, bass and vocals. Attack has three modes and the ratio has five settings, and a sidechain high-pass filter keeps low-end instruments from triggering the compression. Modern enhancements add to the classic character for mix bus work.
Key features
- Dual independent channels. Two channels run side by side, each with its own compression settings, so the plugin can process two sources or work as a stereo bus.
- Built-in limiter. A limiter is included alongside the compressor to control transients on drums, bass and vocals.
- Sidechain high-pass filter. The sidechain high-pass filter keeps low-end content from driving the compressor, which suits bass and other low-frequency instruments.
Compatibility
MK-609 comes as VST2, AU and AAX for Windows and macOS (64-bit), with macOS 10.7 and Windows 7 as the minimum operating systems.
MK-609 compared with similar plugins
Arturia’s Comp DIODE-609 is an effects compressor in VST2, AU and AAX, and IK Multimedia’s Bus Compressor adds VST3 to the set of formats. Softube’s Bus Processor is an effects compressor in VST3, VST2, AU, AAX and RTAS.
| Plugin | Developer | Type | Formats | Systems | Price |
|---|---|---|---|---|---|
| MK-609 | Kiive Audio | Compressor | VST2, AU, AAX | Windows, macOS | €145.73 |
| Diode 609 | Antelope Audio | Compressor | Windows, macOS | €147.76 | |
| Comp DIODE-609 | Arturia | Compressor | VST2, AU, AAX | Windows, macOS | €98.18 |
| Bus Compressor | IK Multimedia | Compressor | VST3, VST2, AU, AAX | Windows, macOS | €118.99 |
| Bus Processor | Softube | Compressor | VST3, VST2, AU, AAX | Windows, macOS | €58.51 (regular €147.76) |
Price and availability
MK-609 was listed on Plugin Boutique in October 2026 at €145.73. Prices change often, so the store page shows the current one.
MK-609 FAQ
Where can I download MK-609 crack for free?
Free MK-609 crack releases circulate as .rar and .iso repacks for both Windows and macOS builds.
Is there a working serial key or keygen for MK-609?
A working serial is the string most often typed in searches, and keygen releases are packed alongside the crack.
Is MK-609 available as a torrent or magnet link?
Torrent and magnet link copies of the release circulate, often as a repack with the .dmg crack or x64 crack builds.