{"product_id":"by-bosch®-lbb4428-00-8-channel-praesideo-power-amplifier-with-60-w-outputs-dsp-processing-and-en-54-certified-supervision-features","title":"Bosch LBB4428\/00 8-Channel Power Amplifier for Praesideo Emergency Voice Alarm Systems","description":"\u003ch4\u003eDescription\u003c\/h4\u003e\n\u003cp\u003eThe Bosch LBB4428\/00 8-Channel Power Amplifier is a high-capacity network audio amplifier designed for Praesideo public address and emergency voice evacuation systems. It provides eight independent 60 W amplifier channels with integrated audio processing, loudspeaker supervision, and redundant network connectivity for critical communication environments. The unit supports 100 V, 70 V, and 50 V loudspeaker outputs, making it suitable for large-scale distributed audio installations.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBosch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePublic Address Systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLBB4428\/00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMulti-Channel Power Amplifiers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAmplifier Channels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8 Channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Output Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8 x 60 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSpeaker Output Tappings\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 V \/ 70 V \/ 50 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNetwork Connectivity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePraesideo Network\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAudio Inputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 Mic\/Line Inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eControl Inputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8 Programmable Inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eControl Outputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8 Outputs (1 per Channel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e80 Hz to 19 kHz (-3 dB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSignal-to-Noise Ratio\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;85 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDistortion\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;0.3% at 1 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 to 240 VAC ±10%, 50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBackup Power Input\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e48 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Consumption\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e430 W Maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandalone or 19-inch Rack Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-5°C to +55°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCertifications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEN 54-16, ISO 7240-16, IEC 60945\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e88.9 x 482.6 x 398.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15.8 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eInformation About LBB4428\/00\u003c\/h4\u003e\n\u003cp\u003eThe LBB4428\/00 is a Praesideo series multi-channel power amplifier engineered by Bosch for professional voice alarm and public address applications. It combines eight amplifier channels, digital signal processing, line supervision, and spare amplifier switching within a single rack-mount chassis for centralized audio distribution systems. The amplifier supports both single branch and redundant loop network cabling while continuously reporting operational status to the network controller for system monitoring and fault management. Designed for EN 54-certified emergency installations, the unit includes programmable control inputs and outputs, local audio inputs, pilot tone supervision, and integrated backup power support for uninterrupted operation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEight Amplifier Channels: Provides eight independent 60 W audio output channels for distributed loudspeaker systems.\u003c\/li\u003e\n\u003cli\u003eMultiple Output Tappings: Supports selectable 100 V, 70 V, and 50 V speaker line configurations.\u003c\/li\u003e\n\u003cli\u003eIntegrated Audio DSP: Includes parametric EQ, shelving EQ, configurable delay, and automatic volume control.\u003c\/li\u003e\n\u003cli\u003eLoudspeaker Line Supervision: Monitors speaker lines and detects short-circuit and short-to-ground faults.\u003c\/li\u003e\n\u003cli\u003eRedundant Network Support: Compatible with both branch and loop network topologies for enhanced reliability.\u003c\/li\u003e\n\u003cli\u003eSpare Amplifier Switching: Built-in relay functionality allows automatic changeover to backup amplifiers.\u003c\/li\u003e\n\u003cli\u003eProgrammable Control Inputs: Features eight supervised control inputs and channel-specific control outputs.\u003c\/li\u003e\n\u003cli\u003eEN 54 Certified Design: Approved for emergency voice alarm and evacuation system applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe LBB4428\/00 delivers the reliability and precision required for professional public address, emergency evacuation, and distributed audio communication systems.\u003c\/p\u003e","brand":"Bosch","offers":[{"title":"Default Title","offer_id":51549584982314,"sku":"LBB4428\/00","price":1525.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/0392\/4266\/files\/1_large_4718293b-a75e-4b7a-a907-04696dab7399.jpg?v=1779137862","url":"https:\/\/iqelectro.com\/products\/by-bosch%c2%ae-lbb4428-00-8-channel-praesideo-power-amplifier-with-60-w-outputs-dsp-processing-and-en-54-certified-supervision-features","provider":"IQElectro","version":"1.0","type":"link"}