TECHNICAL NOTES & SPECIFICATIONS
ARCHITECTS SPECIFICATIONS
Protea System II 4.24GS Four Channel Digital Graphic Equalizer Slave
24 Bit A/D - D/A Audio Resolution
24 Bit/100MHz (x2) Digital Signal Processing
Four 28-Band 1/3 Octave Channels of EQ
Programmable Compressor/Limiter
Programmable Delay up to 1.364 Seconds
Programmable High and Low Pass Filters
Control From 4.24G, 4.24RD, PC or MIDI
Contact Closure for External Recall of 6 Scenes
Balanced XLR and 1/4 Inputs and Outputs
Linkable Channels
Constant Q/Reciprocal Filter Design
+/- 15dB Boost and Cut, 0.5dB increments
128 Preset Locations, 50 Scenes
RS-232 Computer Interface
Full MIDI Implementation
5-Year Worry-Free Warranty
Protea System II 4.24GS
The programmable graphic equalizer shall consist of four independent chan-
nels of 24 bit digital graphic equalization. Each channel shall consist of 28 bands
centered on standard ISO frequencies at intervals of 1/3 octave and covering a
frequency range of 31Hz to 16kHz. The range of equalization per band shall be
±15dB in 0.5dB increments. The equalizer shall have a gain of unity with all
bands set at zero, and shall have a maximum in/out level of +20dBu. Frequency
response shall be ±.25dB 20Hz to 20kHz. Dynamic Range shall be greater than
110dB (20Hz-20KHz, unweighted) and SMPTE intermodulation distortion or
THD shall be less than 0.01% at 1KHz, +20dBu. Input impedance shall be 18K
ohms balanced. Output impedance shall be 200 ohms. Inputs and outputs shall
be balanced type on XLR and 1/4" phone jacks. Individual filters shall be of a
constant Q reciprocal filter design. Boost and cut characteristics shall be fully
symmetrical. The equalizer shall also include on each channel a 24dB per octave
high pass filter adjustable from 20Hz to 10.6KHz, a 24dB per octave low pass fil-
ter adjustable from 33Hz to 20KHz, a full function, pre/post switchable compres-
sor/limiter with adjustable threshold, ratio, attack and release controls, and a time
delay capable of a maximum of 1.364 seconds adjustable in 20us increments. LED
indicators shall show signal present, clip and MIDI channel number. Channel
gain shall be adjustable over a range of +6dB to - infinity in 0.5db increments.
Control of the unit shall be from the 4.24G, via the optional 4.24RD remote con-
trol, via RS-232 serial port using Ashly Protea System Software, or via MIDI.
External recall of up to six scenes via contact closure shall be accessable through a
db9 connector. The equalizer shall weigh 13 lbs net and mount in a standard 19"
rack using 2 spaces (3.50" high). The power requirement shall be 90-125VAC (180-
250VAC, switchable), 50-60Hz, 27W. The unit shall be an Ashly Audio Protea
System II 4.24GS.
The optional remote controller shall operate all functions of the Protea unit
using push-buttons and shall be phantom powered from the Protea unit so that
no batteries or AC line cords are needed while controlling the Protea unit.
Connections between the controller and Protea unit shall be accomplished using
standard XLR mic cables. A 240 X 64 fluorescent backlit LCD display shall show
all parameter, function and utility information. LED indicators shall show chan-
nel and mute conditions. The remote controller shall have a low profile for desk-
top operation. The remote controller shall be the model Protea System II 4.24RD.