528E
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IntroductionChapter 1
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The Symetrix 528E is a single-channel Voice Processor intended for use in voice-over studios,
broad cast studios, sound-reinforcement, music and speech recording, and post-production. Simply
stated, the 528E consists of a high-quality microphone preamp coupled to a three-band paramet-
ric equalizer, a de-esser, and a dynamic range processor. It is everything you would have at your
disposal in a world-class mixing console. The 528E accepts both mic and line inputs. Of course,
while we use the term “Voice Processor” for the 528E, it is perfectly at home with any signal, vocal
or not.
The microphone input uses a balanced-transformerless design using an integrated circuit spe cifi -
cal ly developed for this application. The 528E’s microphone input works with any phantom-pow-
ered condenser microphone or any low-impedance microphone having a balanced, fl oating output.
The line input uses a balanced transformerless design. The line input’s design uses matched resis-
tors to attain a high, wideband, CMRR (common-mode rejection ratio) and multistage RFI fi lters to
prevent Radio Frequency interference problems.
The de-esser operates by selectively removing the high frequencies from the input signal when
sibilant sounds are present and exceed the threshold level. The fi lter frequency can be varied over a
wide range to accommodate different speakers and languages.
The dynamic range processor combines an interactive compressor/limiter and a downward ex-
pand er. Typically, the downward expander helps reduce studio noise as well as the artifacts of close
miking. The compressor/limiter gives you overall control over the dynamic range of the output
signal and helps maintain a high overall signal level. The three-band parametric equalizer is a recip-
rocal-curve design. An unusual leapfrog topology minimizes the number of amplifi ers in the signal
path while ensuring that each frequency band interacts with its neighbor in a desirable and musical
fashion.
The 528E’s output section can drive balanced loads at line or mic levels. A line-level unbalanced
output is also provided. For broadcast applications, a switchable voice symmetry circuit helps make
speech waveforms more symmetrical, which makes better use of the transmitter’s output power.
Each of the dynamics processors have individual six-segment LED displays and an eight-segment
display monitors the overall output level. All inputs and outputs are available via XLR connectors
and the connection points between the individual processors can be accessed via TRS phone jacks.
The interstage patching may be used to change the insertion order of the processors or to insert ad-
ditional processing.
We recommend that you read this manual from cover to cover. Somewhere between the confi nes of
the two covers you should fi nd the answers to most (98%) of your questions, both technical as well
as musical. Should you have any comments or questions, please do not hesitate to contact us at the
numbers/addresses below. Your calls are always wel come.
Phone: (425) 787 -3222
Fax: (425) 787 -3211
Email: symetrix@symetrixaudio.com
Web site: www.symetrixaudio.com
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