The Symetrix 421m is a wide-range AGC-Leveler, a peak limiter, and a downward expander that
features a microphone preamp, eliminating the need for a separate outboard microphone preamp in
some applications. The 421m reduces the dynamic range of its input signal by the amount of its
ratio setting. That is, if the ratio setting is 2:1, then 40 dB of input range turns into 20 dB at the
output. A fast peak limiter puts an absolute ceiling on the output level so you know that peaks are
held to the level that you set. A downward expander reduces the gain when signal levels fall too
low to process, reducing the noise buildup at low signal levels. Speech filters allow a reduction of
reduction the bandpass of the 421m to minimize feedback or amplifier power waste caused by
spurious out-of-band signals.
AGC-Levelers can be used anywhere that you might need to reduce the dynamic range of an audio
signal over a wide range of signal levels. Possible applications include: tape duplication (especially
cassette), driving telephone lines, driving broadcast or STL transmitters, podium or lectern microphones,
paging systems, unattended sound systems, and music recording.
Hey Guys and Gals! So I picked up a Symetrix 421m recently for 25 dollars at a thrift store (they sell for 250 new in box), and I've been reading a bit about it and playing with it a little, and it sounds okay. I'm trying to form my opinion on it, but I'd...
Well, that's not really the point. The Symetrix 421m is really a low end piece of gear, and one I haven't seen many people use for recording or mixing, not comparable at all to 1176s. Of course I'd love to have racks of expensive compressors, too. I just want to know...
Well the 1176/LA-2A were just examples. Theres plenty of 'low end' knock offs like the WA stuff. Regardless of what you use, the answer really is, does it work for you? It might be 'low end' but does it do its job and get you the results you want? Thats the real decision maker. I...
Nobody has reviewed this product yet. Have an opinion?