BOSE CSP-428 PROCESSOR

The Bose Professional commercial sound processor simplifies quick-turn installations requiring music and microphone reinforcement with intelligent controls.

AutoVolume adjusts sound levels in real time, adapting to changing ambient noise, while SmartBass ensures balanced bass that enhances any environment.

With the time scheduler, you can automate source and level changes throughout the day, eliminating the need for manual adjustments. The network-based architecture allows for easy setup and real-time management via a browser interface or offline configuration utility.

CSP supports up to five listening areas, managed by optional digital controllers or the ControlSpace Remote app, and features upgraded mixing functionality to blend multiple input sources, perfect for live microphone reinforcement.

In conclusion, the Bose Professional sound processor is a versatile, efficient solution for high-quality sound reinforcement with user-friendly, network-based control.

FEATURES

• Ensure optimal sound levels with AutoVolume, which adjusts in real-time to ambient noise, keeping music at the ideal level when paired with AVM-1 sense microphones (sold separately). Upgrade to the CSP-1248 processor to support up to five AVM-1 units, or choose the CSP- 428 processor for up to two units.

• Deliver the perfect bass level—noticeable yet never overpowering. SmartBass delivers balanced bass, adapting to room acoustics and ear sensitivity for rich, non-overpowering sound, even at low volumes.

• Struggle no more with uneven audio levels between different sources. Opti-Source Level Management, which adjusts the input of up to four sources for uniform volume. Opti-Voice ensures smooth transitions between music and announcements.

• Take advantage of full mixing functionality, allowing input sources to be mixed and assigned to each listening area.

• Zone the sound system to tailor audio for each area, creating up to five distinct listening zones. Control each with optional wall-mounted ControlCenter controllers or the ControlSpace Remote app.

• Use the CSP Configuration Utility app to pre-configure devices, and export settings.

• Right-sized connectivity for cost-effective commercial installation — 2 x 2 balanced analog I/O, 2 pair mono-summed RCA inputs, 8 control inputs, 1 control output, mute contact, Ethernet port, and Bose Professional AmpLink connectivity.

• Bose Professional AmpLink output for simplified digital audio connection to compatible power amplifiers, reducing terminations, and related points of failure.

• Simplify wiring with a network-based architecture, using Cat-5 or Cat-6 wiring and PoE capabilities. Supports both DHCP and static IP schemes for flexibility and scalability.

Applications

Designed for a wide range of applications, including:

• Retail
• Restaurants
• Bars & Pubs
• Hospitality
• Fitness
• Offices

SPECS

Technical Specification

• Channel Separation (Crosstalk)

• < -105 dB at +4 dBu, 1 kHz input signal

• Dynamic Range

• > 115 dB, A-weighted, 20 Hz – 20 kHz, analog through

• Frequency Response

• 20 Hz – 20 kHz (+0.3 dB/-0.5 dB)

• THD+N

• < 0.01% at +4 dBu (A-weighted, 20 Hz – 20 kHz)

• AEC-Enabled

• No

• Input Channels

• 4 (2 unbalanced, summed-mono + 2 balanced, mic/line)

• Connectors

• (2) RCA stereo pairs, (1) 3-pin Euroblock, (1) 4-pin Euroblock

• Equivalent Input Noise

• < -119 dBu at 64 dB gain (150 O input, 22 Hz – 20 kHz)

• Sensitivity Options

• -70 dBu, -60 dBu, -50 dBu, 0 dBu, +4 dBu, -10 dBV, selectable phantom power

• Input Impedance

• 12 kO at 1 kHz, with or without phantom power

• Maximum Input Level

• +24 dBu at 0 dB gain (20 Hz – 20 kHz, THD+N < 0.3%)

• Phantom Power

• 48 V, selectable per input, open circuit, 10 mA maximum per channel, 80 mA maximum across all channels

• Channels

• 8 AmpLink out

• Connectors

• (1) RJ-45 AmpLink out

• Type

• AmpLink (output)

• Channels

• 2 balanced, line

• Connectors

• (2) 3-pin Euroblock

• Maximum Output Level

• +24 dBu (22 Hz – 20 kHz, THD+N < 0.3%)

• Output Impedance

• 66 O

• EN 54-24 Certified

• No

• Inputs (Control)

• (8) digital, 9-pin Euroblock, 3.81 mm / (1) digital, 2-pin Euroblock, 3.81 mm (mute)

• Digital Input Voltage

• 0 V – 3.3 V (1.6 V threshold)

• Outputs (Control)

• (1) digital, 2-pin Euroblock, 3.81 mm, detachable

• Output Current

• 10 mA source, 100 mA sink (24 VDC maximum external supply voltage)

• Output Voltage

• High: 8 V (open circuit), 2.5 V at 10 mA / Low: < 1 V at 100 mA, push-pull

• Mains Connector

• IEC 60320-C14 inlet

• Mains Voltage

• 85–264 VAC, 50/60 Hz

• AC Power Consumption

• < 30 W typical, over all mains voltages (power supply maximum < 45 W)

• Power Dissipation

• 22 W (75 BTU/hr, 19 kcal/hr)

• Computer Interface Connection

• RJ-45 (Ethernet, 10/100 Mbps)

• LED Status Indicators

• (1) power/status LED, (1) input/output signal LED, (1) Ethernet LED, (1) AmpLink LED

• A/D and D/A Converters

• 48 kHz / 24-bit

• Audio Latency

• 900 µs, analog input to analog output

• DSP-Enabled

• Yes

• Maximum Calculation

• 3.6 GIPS / 2.7 GFLOPS

• Signal Processor/CPU

• 32-bit fixed/floating-point DSP + Arm 456 MHz processor

• Sample Rate / Bit Depth

• 48 kHz / 24-bit

• Colors

• Black

• Cooling System

• Active, side-venting with fan

• Suspension/Mounting

• Standard rack ears

• Operating Temperature Range

• 0 °C to 40 °C (32 °F to 104 °F)

• Product Dimensions (H×W×D)

• 1.7 in × 19.0 in × 8.5 in (44 mm × 483 mm × 215 mm)

• Rack Spaces

• 1RU

• Storage Temperature

• -40 °C to 70 °C (-40 °F to 158 °F)

Mechanical Diagrams

Product codes

• 808453-1110
• CSP-428, 120V, US

• 808453-2110
• CSP-428, 230V, EU

• 808453-3110
• CSP-428, 100V, JP

• 808453-4110
• CSP-428, 230V, UK

• 808453-5110
• CSP-428, 240V, AU

Warranty Period

• 5 years

Included in Packaging

• (1) 3-pin Euroblock connector

• (11) cable ties

• (1) 6-pin Euroblock connector

• (1) 4-pin Euroblock connector

• (2) 2-pin Euroblock connectors

• (1) 9-pin Euroblock connector

• (1) CSP-428

• (1) AC power cord

• (1) installation guide

DOWNLOADS

• Technical Data Sheet

• Bose Professional Configuration Utility Tool

• Discovery Tool

• CSP Firmware 2.3

• Release Notes 2.3

• Serial Control Protocol Guide v1.0

• CSP Firmware 2.2

• Release Notes 2.2

• CSP Firmware 2.1

• Release Notes 2.1

• CSP Firmware 1.0.7

• Release Notes 1.0.7

• CSP Firmware 1.0.5

• Release Notes 1.0.5

• CSP Firmware v1.0.4

• Release Notes 1.0.4

• CSP Firmware v1.0.3

• Release Notes 1.0.3

• CSP Firmware v1.0.1

• Release Notes 1.0.1

• CSP Firmware v1.0

• Release Notes 1.0

• Installation Guide

• Application Note

• CAD Files

• Declaration of Conformity

• Product Image Files