The Bose Professional CSP-428 Commercial Sound Processor is part of a comprehensive platform that includes loudspeakers, controls, and software that help installers deliver premium sound systems efficiently to a variety of applications including retail, restaurants, and hospitality industry.
The processor’s I/O options include 2×2 balanced analog I/O, 2 pairs of mono-summed RCA inputs, 8 control inputs, 1 control output, mute contact, Ethernet port, and Bose AmpLink connectivity. An onboard CSP configuration utility and intuitive browser-based user interface help you set it up. Common tasks are presented in a logical way, so you can configure the system faster with accuracy and reduced setup time.
Once installed, the proprietary algorithms provide predictable performance, while separately sold digital zone controllers and the ControlSpace app make operation even easier for the end user.
FEATURES
- Flexible Connectivity
- CSP Configuration Utility (Browser UI)
- Rear-Panel Ethernet for PC/Mac Config
- AutoVolume Compensation Capable
- Opti-Voice Paging for Voice / Music
- Opti-Source Level Management
- SmartBass Processing
- Bose AmpLink Output
- Intuitive End-User Operation
- Control via ControlCenter Controllers
SPECIFICATIONS
| DSP Section |
Signal Processor/CPU: 32-Bit Fixed / Floating-Point DSP + ARM, 456 MHz
Maximum Calculation: 3.6 GIPS / 2.7 GFLOPS
Audio Latency: 900 μs (Analog In to Analog Out)
A/D and D/A Converters: 24-Bit
Sample Rate: 48 kHz
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| Audio Performance |
Frequency Response: 20 Hz to 20 kHz (+0.3 / -0.5 dB)
THD+N: <0.01 % at +4 dBu (A-weighted / 20 Hz to 20 kHz)
Channel Separation (Crosstalk): <-105 dB at +4 dBu Input and Output Level, 1 kHz
Dynamic Range: >115 dB A-Weighted 20 Hz to 20 kHz, Analog Through
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| Analog Audio Inputs |
Input Channels: 4 Analog Inputs (Two Unbalanced, Two Balanced)
Connectors:
Inputs 1-2: RCA pairs
Inputs 3: 3-Pin Euroblock
Input 4: 4-Pin Euroblock with Dedicated GPI for Paging
Types:
Inputs 1-2: Unbalanced, Mono-Summed
Inputs 3: Balanced, Mic/Line
Input 4: Balanced Mic/Line or 600-Ohm Paging Input
Sensitivity Options (via Configuration Utility):
Inputs 1-2: -10 dBV
Inputs 3: -70 / -60 / -50 / 0 /+4 dBu, -10 dBV with Selectable Phantom Power
Input 4: -70 / -60 / -50 / 0 /+4 dBu, -10 dBV with Selectable Phantom Power
Input Impedance: 12 Kilohms at 1 kHz (with or without Phantom Power Active)
Maximum Input Level: +24 dBu (THD+N <=0.3%, 20 to 20 kHz, 0 dB Gain)
Equivalent Input Noise: <-119 dBu (22 Hz – 20 kHz, 150-Ohm Input, 64 dB Gain)
Phantom Power: +48 V, Open Circuit, 10 mA Max per Channel, Selectable per Input, 80 mA Max Across All Channels |
| Analog Audio Outputs |
Output Channels: 10 (2 Analog, 8 Digital via AmpLink)
Connectors:
Analog Outputs 1: 3-Pin Euroblock
Analog Output 2: 3-Pin Euroblock
Digital Outputs: RJ-45
Types:
Analog Outputs 1: Balanced Line Level
Analog Output 2: Balanced Line Level, or Fully-Isolated Output for Music On-Hold for 600-Ohm Telephone Systems (Activated in Configuration Utility)
Digital Outputs: 48 kHz, 8-Channel Digital Audio Over AmpLink
Output Impedance: 66 Ohms
Maximum Output Level: +24 dBu (THD+N <=0.3%, 22 Hz to 20 kHz) |
| Control Inputs |
Inputs (Control): 8 Digital Inputs, 2 Kilohms Internal Pull-Up Resistor to 5 V, Green 0.15″ / 3.81 mm Pitch Connector (9-Pin)
Mute (Control): 1 Digital Input, 2 Kilohms Internal Pull-Up Resistor to 5 V, Black 0.15″ / 3.81 mm Pitch Connector (2-Pin)
Digital Input Voltage: 0 V to 3.3 V (Threshold Voltage = 1.6 V)
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| Control Output |
Outputs (Control): 1 Digital Output, Orange 0.15″ / 3.81 mm Pitch Connector (2-Pin)
Output Voltage High: 8 V (Open Circuit), 2.5 V at 10 mA; Low: <1 V at 100 mA, Push Pull
Output Current 10 mA source, 100 mA Sink (24 VDC Max. External Supply Voltage)
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| Indicators & Controls |
LED Status Indicators: Power/Status, Signal, Ethernet, AmpLink
Audio Signal Indication: Green (-60 to -20 dBFS), Yellow (-20 to -2 dBFS), Red (-2 dBFS to Clip)
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| General |
Configuration Software: Web-Browser-Based Configuration Utility
Network Control: Ethernet (RJ-45), 1 Gbps
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| Operating Temperature |
32 to 104°F / 0 to 40°C
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| Cooling System |
Active, Side Venting with Fan
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| Power |
Mains Voltage: 85 to 264 VAC, 50/60 Hz
Mains Connector: IEC 60320-C14 (Inlet)
Power Dissipation: ~22 W (75 BTU/Hr, 19 kcal/hr)
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| Dimensions |
1.7 x 19 x 8.5″ / 4.3 x 48.3 x 21.6 cm
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