Symetrix 258E, User Manual, Page: 40 / 46

528E
38
528E Architects and Engineers Specifications
The voice processor shall be capable of all signal processing functions commonly found on a
mixing console input channel, including microphone signal preamplification, line input buffering,
simultaneous de-essing, downward expansion, compression/limiting, and parametric equalization.
The unit shall have a low-noise, low distortion microphone preamplifier with variable gain (22 dB
to 60 dB) and switchable (on/off) +48V phantom power. A 15 dB pad shall be provided to
accommodate high output microphone signals. A balanced-bridging line input suitable for +4 dBu
input signals shall also be provided along with a switch to select either the microphone or line
inputs.
The voice processor shall have an integral de-esser which shall offer up to 20 db of attenuation
within a manually sweepable frequency range of 800 Hz to 8 kHz. There shall be front panel
controls for range, frequency, and a bypass switch.
The dynamics processing section shall contain an interactive compressor/limiter and downward
expander. There shall be front panel controls for compression ratio (1:1 to 10:1), compressor
threshold (-50 dBm to +20 dBm), expander threshold (-30 dBm to 0 dBm), and a bypass switch.
There shall be a three-band parametric equalizer. Each band shall have ±15 dB maximum boost/
cut, and continuously variable bandwidth (.3 octaves to 4 octaves). The equalizer bands shall have
substantially overlapping frequency ranges, with a combined range of 16 Hz to 22 kHz. There
shall be a front panel bypass switch.
The voice processor shall be equipped with the following LED displays: An eight-segment LED
display shall be provided for monitoring the overall output level, six-segment displays for monitor-
ing the de-esser, compressor/limiter, and downward expander. All displays shall be independent.
There shall also be a single LED clip indicator to indicate clipping within either of the input
preamplifiers or buffers.
The microphone input shall be an active balanced bridging design terminated with 3-pin XLR-
female connector (AES/IEC standard wiring). The microphone preamp shall be capable of an
equivalent input noise specification of at least -126 dBu (150-Ohm source, 60 dB gain, 20 Hz to
20 kHz). The line input shall be a balanced, transformerless design using a 3-pin XLR-female
connector (AES/IEC standard wiring). All input circuitry shall incorporate RFI filters of the LC
low-pass type.
The output shall be an active balanced design terminated with a 3-pin XLR-male connector (AES/
IEC standard wiring). The output signal level shall be switchable to accommodate subsequent line
or microphone inputs. The output section shall provide a switchable phase rotator for the purpose
of improving the asymmetry of speech waveforms.
Access to the dynamics processing sidechain shall be provided via a ¼" TRS jack. Access to the
interstage connections between all processing sections (mic/line preamp, de-esser, compressor/
limiter/downward expander, equalizer, output stage) shall be provided via half-normalled tip-ring-
sleeve (TRS) jacks.
The voice processor shall be capable of operating by means of its own built-in power supply
connected to 117V AC nominal (105 to 130V), 50/60 Hz or 230V AC nominal (207 to 253V ),
50 Hz.
The unit shall be a Symetrix Incorporated model 528E Voice Processor.