Manley Stereo Variable MU Limiter Compressor - Mastering Version
Hugely popular Stereo Limiter/Compresser Mastering Version
An industry standard for professional mastering studios, the Mastering Version of the Stereo Variable Mu Limiter Compressor employs metal-film resistors loaded onto beautiful Grayhill sealed gold-contact switches for absolute repeatability, accuracy, and reliability. 1/2dB steps ensure precise and subtle adjustments. This is what defines mastering. High Pass Side Chain mod now comes standard.
From the very begining MANLEY LABS have been closely involved with numerous mastering facilities around the world. For these most demanding engineers in the industry, they have created specialized products such as the all-tube tape repro head amps, digital converters, high-powered vacuum tube monitor amplifiers, through to custom monitoring consoles, all the way up to complete facility design and installation.
The Mastering Version of the Variable Mu Limiter Compressor incorporating detented and logable steps built with 1% metal film resistors on sealed gold-contact Grayhill switches is available. NO, they will not mod a "normal" unit to the Mastering Version.
The High Pass Side Chain mod comes stock on all Manley Variable Mu limiter/compressors since 12/2009, on both regular and mastering versions. This mod adds two switches to the front panel, one for each channel, so that when engaged, the side chain will not respond to frequencies lower than 100Hz. (They standardly use 100Hz as the -3dB point. Other frequencies can be custom ordered.) This HP SC Mod can be used with music with heavy bass lines or bass-heavy mixes where you don't want the bass driving the whole action of the compressor.
The filter is a very gentle 6db per octave 1 pole filter, and will typically be down 1-3db at 100 Hz, and down 4-6db at 50Hz. As you decrease the frequency the amount of limiting will decrease also. At the extreme LF (less than 20Hz) there should be very little gain reduction going on. The whole intent of the filter is to keep very LF stuff (like a heavy kick drum) from activating the compression/limiting so that the overall level doesn't duck with every drumbeat.