The Symetrix 425 is a dual channel compressor/limiter/expander. The two channels may be
operated in dual-mono mode, or in stereo mode. In stereo mode, both channels receive
identical control signals, which minimizes image shifts caused by unequal gains in the two
The 425 represents the distillation of 15 years of signal processing experience by Symetrix into a product
that is at once versatile and easy to use without having important controls removed in the interest of simplicity.
The 425 is unique because its processor sections are always in-line. There is no selector switch to select between expander,
compressor, or limiter. Now you can expand the low-level parts of a signal to improve its signal-to-noise ratio, then apply compression to add punch and density and still have the security of a peak limiter for overload protection. We call this approach to total level control IDP or Integrated Dynamics Processing.