Protea System II Digital Processors
Four Inputs and Eight Outputs allow you to distribute audio
from a variety of sources to multiple locations, the Protea
System II 4.24D Digital Distribution System Processor has
all the audio processing tools needed for precise crossover
and sound control.
Each input allows you to control gain, six filters (each of
them your choice of parametric, low or high shelf) and
may be assigned to any one or a combination of outputs.
Each output permits you to set your crossover frequen-
cies. Additionally, you can program four filters (each of
them your choice of parametric, low or high shelf), control
delay (up to 682ms), adjust output gain, reverse polarity
and control a compressor/limiter for speaker protection. All
this in a one rack space with euroblock input and output
connections. To programming the 4.24D, Ashly’s Protea
System Software (Windows
TM
95, 98, 2000 and NT plat-
forms) is used. Thirty presets may be saved and eight may
be recalled via an external switch connected to the contact
closure port on the rear panel.
FEATURES:
• One Rack Space
• Four Inputs - Eight Outputs
• Inputs Assignable to Any Output
• Crossover, EQ, Delay and Limiter Functions
• Linkwitz-Riley, Bessel and Butterworth Filters
• 12, 18, 24 and 48dB/Octave Slopes
• Parametric EQ: Full Bandwidth, 1/64th to 4 Octave Range
• 682ms of Output Delay on Each Output
• Limiter on Each Output
• 30 Presets, 8 Contact Closure Preset Recall
• Programmable by PC or MIDI
• Individual Signal Present, Clip and Limiter Threshold LEDs
• Balanced Inputs and Outputs
• Euroblock Connections
• Four Levels of Security
4.24D DISTRIBUTION PROCESSOR
SPECIFICATIONS:
Input: Active balanced, 18kOhms
Max. input level: +20dBu
Output: Active balanced, 100Ohms
Max. output level: +20dBu
Frequency response: 20Hz-20kHz, ±0.25dB
THD: <0.01% @1kHz, +20dBu
Dynamic range: >110dB (20Hz-20kHz) unweighted
Output noise: <-90dBu unweighted
EQ filters:
Number: 6 per Input, 4 per output
Parametric
Bandwidth: 1/64th octave to 4 octave
Range: +15/-30dB, 0.1dB increments
Frequency resolution: 1/24th octave
High-shelf
Slope: Selectable 6 or 12dB/octave
(1 high shelf, 2 high shelf)
Frequency range: 19.7Hz to 2kHz
Range: +/-15dB, 0.1dB increments
Low-shelf
Slope: Selectable 6 or 12dB/octave
(1 low shelf, 2 low shelf)
Frequency range: 3.1886kHz to 20.1587kHz
Range: +/-15dB, 0.1dB increments
Crossover filters
High pass filter
Type: Linkwitz-Riley, Bessel, Butterworth
Slope: 12, 18, 24 and 48dB/octave
Frequency range: Off to 21.983.3kHz, 245 step increments
Low pass filter
Type: Linkwitz-Riley, Bessel, Butterworth
Slope: 12, 18 and 24dB/octave
Frequency range: Off to 21.983.3kHz, 245 step increments
Delay
Output maximum delay: 682.5ms
Increment: 20µs
Input and output gain:
Range: +12/-40dB, 0.1dB increments
Polarity: 0 or 180 degrees (selectable in
the output gain stage)
Compressor/limiter:
Threshold: -20dBu to +20dBu, 1dB
increments
Ratio: 1.2 :1 to Infinity
(1.2, 1.5, 2., 3, 4, 6, 10, 20, Infinite:1)
Attack: 0.5ms to 50ms per dB
Release: 10ms to 1 sec. per dB
Range: 20Hz to 10.6kHz
Processor:
Input A/D: 24 bit
Output D/A: 24 bit
Processor: 24 bit, 56 bit accumulator
Sample rate: 48kHz
Propagation delay: 1.46ms
Other:
Power requirements: 80–260VAC, 30W
Shipping weight: 10 lbs
Dimensions: 19.0” L x 1.75” H x 6.0” D
I/O connectors: Euroblock
Environmental 40–120 deg. F, non-condensing
(12 Seiten)
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