TECHNICAL NOTES & SPECIFICATIONS
ARCHITECTS SPECIFICATIONS
Protea System II 4.24PS Four Channel Digital Parametric Equalizer Slave
24 Bit A/D - D/A Audio Resolution
24 Bit/100MHz (x2) Digital Signal Processing
Four Channels of 12-Band Parametric EQ
Programmable Compressor/Limiter
Programmable Delay up to 1.364 Seconds
Programmable High and Low Pass Filters
Programmable High and Low Shelf Filters
Control From PC or MIDI
Contact Closure for External Recall of 6 Scenes
Balanced XLR and 1/4 Inputs and Outputs
Linkable Channels
+10/- 20dB 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 4.24PS
The programmable parametric equalizer shall consist of four
independent channels of 24 bit digital parametric equalization.
Each channel shall consist of 12 bands with an adjustable Q
ranging from 1/25th to 3.3 octaves. Frequency adjustment shall
be twenty-four step/octave from 20Hz to 20KHz. The range of
equalization per band shall be +10/-20dB 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. Each channel
shall have a programmable high shelf filter adjustable from
1.6KHz to 20KHz and a low shelf filter adjustable from 20Hz to
240Hz. Level adjustment of the High and Low Shelf shall be in
0.5dB increments with a range of +/-15dB and shall have a selec-
table slope of 6 or 12dB. 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 filter 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 sec-
onds 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 via the 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, switch-
able), 50-60Hz, 27W. The unit shall be the Ashly Audio Protea
System II 4.24PS.