Bose Professional
CSP-428 commercial sound processor
Processors

CSP-428 commercial sound 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.

Order Codes · 5

See all →
Request a Full System Quote
  • Authorized productFull manufacturer warranty
  • Ships from A5 ITCrystal Lake, Illinois
  • Design supportSpecify the whole system

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 appto pre-configure devices, and export settings.

  • Right-sized connectivityfor 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 outputfor 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

Specifications

44 specifications

AMPLIFICATION

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)

ACOUSTIC ECHO CANCELATION (AEC)

AEC-Enabled
No

AUDIO INPUTS, ANALOG

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 Ω 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 kΩ 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

AUDIO INPUTS/OUTPUTS, DIGITAL

Channels
8 AmpLink out
Connectors
(1) RJ-45 AmpLink out
Type
AmpLink (output)

AUDIO OUTPUTS, ANALOG

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 Ω

COMPLIANCE

EN 54-24 Certified
No

CONTROL INPUTS

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)

CONTROL OUTPUTS

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

ELECTRICAL

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)

GENERAL

Computer Interface Connection
RJ-45 (Ethernet, 10/100 Mbps)

INDICATORS AND CONTROLS

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

INTEGRATED DSP

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

PHYSICAL

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)

Order Codes

Order CodeDescriptionAvailability
808453-1110CSP-428, 120V, USGet Price
808453-2110CSP-428, 230V, EUGet Price
808453-3110CSP-428, 100V, JPGet Price
808453-4110CSP-428, 230V, UKGet Price
808453-5110CSP-428, 240V, AUGet Price

In the Box

  • 5 years
  • (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

17 documents

Technical Information

Latest Firmware

Third-Party Integration

Previous Firmware

User Documentation

Design Tools

Mechanical Files

Compliance Documents

Specifying CSP-428 commercial sound processor?

A5 IT quotes complete Bose Professional systems — loudspeakers, amplifiers, processing and control — with design support and project pricing.

Request a QuoteBrowse the Catalog