Bose CSP-428 Processor

A Zone Processor Designed for the ControlSpace Ecosystem

The CSP-428 fits within Bose Professional's "installation" approach: centralizing sources, organizing distribution by zones, and ensuring a consistent daily experience. Its philosophy is clear: to offer a processor/zone processor that simplifies operation (level recalls, scheduling scenarios, music/announcement transitions) while maintaining advanced audio settings tailored to the real constraints of retail, restaurants, reception areas, or multipurpose rooms.

Who Is the Bose Pro CSP-428 For?

The CSP-428 is intended for installers and operators who want reliable sound reinforcement that is easy to manage and consistent from zone to zone. It is particularly suited for locations alternating between background music, announcement microphones, and occasional content, with a demand for listening comfort: message intelligibility, controlled volume, and better-balanced bass according to acoustics. Thanks to its network control and automation options, it also meets the needs of multi-area sites aiming to minimize daily technical interventions.

Processing, Automation, and Distribution: A DSP Designed for Operation

Integrated Audio Processing for a More Consistent Sound

The CSP-428 features a DSP and Bose Professional processing focused on practical use. AutoVolume adjusts levels based on ambient noise to maintain stable perception (useful when crowd levels vary). SmartBass helps achieve more balanced bass by considering the acoustics. Finally, Opti-Source Level Management aims to equalize the level between multiple sources to avoid volume discrepancies when switching inputs.

Opti-Voice: More Natural Transitions Between Music and Announcements

For environments where announcements must remain clear without being harsh, Opti-Voice facilitates smooth transitions between music and voice. The goal is to improve intelligibility and listening comfort by limiting the "cut-off" effect when switching from background music to microphone messages.

Mixing and Scheduling Scenarios

The built-in mixing function allows combining sources according to site needs. The time scheduling (automation of sources and levels) is ideal for adapting playback throughout the day: opening, peak hours, closing, or event management, while reducing manual adjustments.

Control, Network, and AmpLink Outputs

The CSP-428 is managed via browser or offline software and can be controlled through the ControlSpace Remote app. For integration, the network configuration supports DHCP or static IP. The 8 AmpLink digital channels on RJ-45 facilitate audio distribution to compatible equipment, complementing the 2 analog outputs for other uses (dedicated zone, recording, feedback, etc.).

Technical specifications

Model	Bose Pro CSP-428	THD+N	<0.01% @ +4 dBu
Type	Distributor / Zone Processor	Audio latency	900 µs (input to output)
Manufacturer reference	808453-2110	Dynamic range	>115 dBA
Audio processor	Bose Professional	Analog inputs	2x 2 RCA + 2x Euroblock (mic/line)
Management interface	Browser or offline software	Analog outputs	2x Euroblock
Control application	ControlSpace Remote	Digital output	8 AmpLink channels (RJ-45)
Scheduling	Automation of sources and levels	Control inputs	9-pin Euroblock
Mixing function	Yes	Control output	2-pin Euroblock
Audio inputs	4 analog	Mute control	2-pin Euroblock
Audio outputs	2 analog + 8 digital	Ethernet port	RJ-45 (10/100 Mbps)
A/D and D/A converters	48 kHz / 24 bits	Power via connections	PoE and Phantom +48V
Processor	32-bit DSP + 456 MHz ARM CPU	Network configuration	DHCP and static IP
Computing capacity	3.6 GIPS / 2.7 GFLOPS	Power supply	85-264 V AC, 50/60 Hz
Integrated DSP	Yes	Consumption	<30 W (max 45 W)
AutoVolume	Adjusts levels based on ambient noise	Cooling	Active side ventilation
SmartBass	Bass balanced according to acoustics	Rack standard	19 inches
Opti-Source Level Management	Equalizes volume of 4 sources	Height	1U
Opti-Voice	Smooth transitions between music and announcements	Dimensions	483 x 215 x 44 mm
Frequency response	20 Hz to 20 kHz	Weight	3.6 kg