528E
38
528E Architects and Engineers Specifi cations
The voice processor shall be capable of all signal processing func tions commonly found on a
mixing console input channel, including mi cro phone signal preamplifi cation, line input buffering,
si mul ta neous de-essing, downward expansion, com pres sion/limiting, and parametric equalization.
The unit shall have a low-noise, low distortion microphone pream pli fi er with variable gain (22 dB
to 60 dB) and switchable (on/off) +48V phantom power. A 15 dB pad shall be provided to ac com -
mo date 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 con-
trols for range, frequency, and a bypass switch.
The dynamics processing section shall contain an interactive compressor/limiter and downward ex-
pand er. There shall be front panel controls for compression ratio (1:1 to 10:1), compressor thresh-
old (-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
sub stan tial ly 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 dis plays: An eight-segment LED
display shall be pro vid ed for mon i tor ing the overall output level, six-segment displays for mon i -
tor ing the de-esser, com pres sor/limiter, and downward expander. All dis plays shall be independent.
There shall also be a single LED clip indicator to indicate clipping within either of the input pream-
plifi ers or buffers.
The microphone input shall be an active balanced bridging design ter mi nat ed with 3-pin XLR-fe-
male connector (AES/IEC standard wiring). The microphone preamp shall be capable of an equiva-
lent input noise specifi cation 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 con nec tor
(AES/IEC standard wiring). All input circuitry shall incorporate RFI fi lters 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 pro vid ed via a ¼" TRS jack. Access to the
interstage connections between all pro cess ing sections (mic/line preamp, de-esser, com pres sor/
lim it er/down ward expander, equalizer, output stage) shall be pro vid ed 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 con-
nected 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.
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