The 3.6SP is a 3-input by 6-output system processor; the 4.8SP is the 4-in by 8-out model. With active front panel controls, SP’s are at home in a dynamic, live sound environment. The USB inputs (front and rear panel) provide set-up via Protea™ Software, making SP’s a great choice for permanent installations.A backlit 2 x 20-character LCD displays channel and function settings. Dedicated front panel controls provide access to all audio functions and system tools. There is a rear panel RS-232 port in addition to the USB ports.Advantages of using the software include greater preset capacity, and a very intuitive visual representation of the audio routing and control process. A 6-foot (1.8m) USB-A to USB-B cable is provided.
3.6SP & 4.8SP Features: 
• Front Panel Parameter Control
• Single rack space with XLR audio connections
• Extremely intuitive user interface
• Crossover, EQ, delay and limiter functions
• Outputs assignable to any input
• Front panel or PC programming and control
with 4 levels of security
• USB and RS-232 interface
• Third-party control friendly
• Balanced inputs and outputs
• Linkwitz-Riley, Bessel and Butterworth filters
• 12, 18, 24 and 48dB/octave slopes
• Parametric EQ: 1/64th to 4 octave range
• 682ms input and output delay (1,364ms total)
• Limiter on each output
• Individual input and output metering
• Safety/Compliance: CE, FCC, RoHS
| Specifications | Note: 0dBu = 0.775 VRMS |
| Input | Active Balanced, 18k Ohms |
| Input Level | +20dBu (Max) |
| Input Gain Range | -40dB–+12dB |
| Output | Active Balanced, 112 Ohms |
| Output Level | +20dBu (Max) |
| Output Gain Range | -40dB–+12dB |
| Weights, Dimensions & Power | |
| Unit Weight | SP3.6: 7lbs (9.54kg) SP4.8: 7.3lbs (3.3kg) |
| Shipping Weight | SP3.6 / SP4.8: 10lbs (5kg) |
| Environmental | 40°F–120°F (4°C–49°C) noncondensing |
| Dimensions | 19” L x 1.75” H x 8.5” D |
| (483mm x 89mm x 216mm) | |
| AC Requirements | Universal Power Supply, |
| 100–240VAC, 50/60Hz, 20W | |
| Equalizer | |
| EQ Filter Types | 1st or 2nd Order High or Low Shelf, |
| Parametric | |
| Shelving Filter Boost/Cut Range | ±15dB |
| Shelving Filter Frequency Range | Low Shelf: 19.7Hz–2kHz, |
| High Shelf: 3.8kHz–21.9kHz | |
| Parametric Filter Boost/Cut Range | +15dB/-30dB |
| Parametric Filter Frequency Range | 19.7Hz–21.9kHz, 1/24 Octave Steps |
| Parametric Filter Bandwidth | Four Octaves to 1/64 Octave |
| Delay | |
| Input/Output Delay | 0–682ms |
| Crossover | |
| HPF/LPF Frequency Range | 19.7Hz―21.9kHz, Off |
| Available Filter Types | 12dB/Oct Butterworth |
| 12dB/Oct Bessel | |
| 12dB/Oct Linkwitz-Riley | |
| 18dB/Oct Bessel | |
| 18dB/Oct Linkwitz-Riley | |
| 24dB/Oct Butterworth | |
| 24dB/Oct Bessel | |
| 24dB/Oct Linkwitz-Riley | |
| 48dB/Oct Butterworth | |
| 48dB/Oct Bessel | |
| 48dB/Oct Linkwitz-Riley | |
| Limiter | |
| Threshold Range | -20dBu–+20dBu |
| Ratio Range | 1.2:1 to ∞:1 |
| Attack Time Range | 0.5ms–50ms |
| Release Time Range | 10ms–1Sec |
| Frequency Response | 20Hz–20kHz, ±0.25dB |
| THD | <0.01% @ 1kHz, +20dBu |
| Dynamic Range | >110dB, 20Hz–20kHz unweighted |
| Audio Sampling Rate | 48kHz |
| Propagation Delay | 1.46ms |
| Signal LEDs (dBu or VU) | |
| Inputs | -20/Mute, -10, 0, +10, Clip |
| Outputs | -20/Mute, -10, 0, Limit Threshold, Clip |
