LEA Professional CS704 – 4-Channel Networked Amplifier 700W Per Channel
LEA Professional CS704 – 4-Channel Networked Amplifier 700W Per Channel is backordered and will ship as soon as it is back in stock.
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LEA Professional CS704 – 4-Channel Networked Amplifier 700W Per Cha...
Product Overview
The LEA Professional CS704 is a 4-channel networked amplifier delivering 700 watts per channel, designed for commercial AV installations where high per-channel output power and intelligent remote management are both system requirements. As part of the LEA Network Connect Series, the CS704 is an IoT-enabled, 1U rack-mount amplifier that connects to standard Ethernet networks and supports remote control and monitoring through the LEA Cloud platform and a browser-based Web UI. It targets small to medium-scale professional installations including houses of worship, auditoriums, multi-purpose rooms, and commercial spaces where reliable high-power amplification with network control is specified. Per-channel HiZ/LoZ selection and Smart Power Bridge technology give integrators flexible load configuration within a single chassis.
Product Description
The CS704 provides four amplifier channels each rated at 700 watts, delivering a total of 2,800 watts of system power in a single 1U rack unit. This power level makes it appropriate for commercial installations requiring more headroom per channel than lower-wattage models, including main-zone speaker systems, auditorium reinforcement, and houses of worship where speaker loads demand sustained high-power output. Each channel independently selects between low-impedance (LoZ: 2Ω, 4Ω, 8Ω) and constant-voltage HiZ (70V or 100V) operation, providing design flexibility when mixed speaker loads exist within the same installation.
Network connectivity is available via three methods: a built-in Wi-Fi access point for direct device connection during configuration, integration into the facility's Wi-Fi network, or wired Ethernet via Cat5 or Cat6. The browser-based Web UI requires no software installation and works from any modern browser. LEA Cloud provides globally accessible remote monitoring, control, and fault alerting via AWS IoT Core infrastructure, without requiring VPN access. Onboard Analog Devices Sigma 96kHz DSP handles all signal processing including input routing, 48dB/octave crossover filtering, 8-band parametric EQ per channel, user-adjustable limiting, output delay, and real-time load monitoring. An external I/O port supports third-party remote on/off and fault status integration. The Class-D output stage with Smart Power Bridge allows any single channel to be bridged for increased power without removing another channel from service.
| Specification | Value |
|---|---|
| Channels | 4 |
| Power Output | 700W per channel |
| Total System Power | 2,800W |
| Output Impedance | LoZ (2Ω, 4Ω, 8Ω) or HiZ (70V / 100V), selectable per channel |
| Audio Inputs | 4 analog balanced inputs (26dB / 34dB selectable sensitivity) |
| THD+N | 0.1% (20Hz–20kHz) |
| Frequency Response | 20Hz–20kHz, ±0.5dB @ 4Ω, 8Ω, 70V, 100V |
| Signal-to-Noise Ratio | 105dB (ref 8Ω) |
| Crosstalk | 70dB (20Hz–20kHz) |
| DSP | Analog Devices Sigma 96kHz, 32-bit core |
| Amplifier Class | Class-D with Smart Power Bridge |
| AC Mains | 100–240VAC ±15%, 50/60Hz (universal) |
| Dimensions (L x W x H) | 14.25" x 19" x 1U (362mm x 482mm x 1U) |
| Weight | 14 lbs / 4 kg |
| Cooling | Front-to-rear variable speed fan |
| Connectivity | Wi-Fi AP, Wi-Fi client, Fast Ethernet (Cat5/Cat6) |
| Control | Web UI (browser-based), LEA Cloud, 3rd-party API (TCP/WebSocket) |
Key Features
- 700W Per Channel — High per-channel output power handles demanding commercial speaker loads including line arrays, subwoofers, and large-format loudspeakers in a single 1U chassis.
- HiZ / LoZ Per-Channel Selection — Each channel independently switches between 70V, 100V constant-voltage and low-impedance modes, supporting mixed load types within one unit.
- Smart Power Bridge — Any channel can deliver bridged output power without taking other channels out of service, providing additional headroom for asymmetric system designs.
- 96kHz Analog Devices DSP — Full-featured onboard DSP provides input routing matrix, 48dB/octave crossover filters, 8-band parametric EQ, speaker limiters, 100ms delay, and real-time load monitoring per channel.
- Three Network Connection Modes — Built-in Wi-Fi access point, Wi-Fi client, and wired Ethernet via Cat5/Cat6 cover the full range of deployment environments.
- LEA Cloud Remote Control — AWS IoT Core-based cloud management provides remote monitoring, control, and fault notification from any internet-connected device without VPN.
- Browser-Based Web UI — Full system configuration from any browser on any device, with no dedicated software download or proprietary control interface required.
- Universal Switch-Mode Power Supply — PFC-corrected supply operates from 100–240VAC, suitable for domestic and international deployment without modification.
- External I/O Port — Accepts remote on/off signal input and outputs amplifier fault status for integration with third-party control systems and building management platforms.
- Open API Integration — TCP and WebSocket-based open API allows control from Crestron, Extron, Q-SYS, AMX, Utelogy, and other AV automation platforms.
- Class-D Efficiency — Highly efficient Class-D output stage reduces AC current draw and heat generation, contributing to lower total operating cost in continuous-use commercial environments.
Typical Applications
- House of worship main zone loudspeaker amplification
- Auditorium sound reinforcement systems
- Multi-purpose room primary amplification
- Commercial meeting spaces with high-power speaker requirements
- All-hands and large conference room audio systems
- Government and institutional facilities requiring network-managed amplification
Technical Specifications
| Category | Specification | Value |
|---|---|---|
| Audio | Channels | 4 |
| Audio | Power Per Channel | 700W |
| Audio | Power @ 2Ω | 350W per channel |
| Audio | Power @ 4Ω | 700W per channel |
| Audio | Power @ 8Ω | 700W per channel |
| Audio | Power @ 70V / 100V | 700W per channel |
| Audio | THD+N | 0.1% (20Hz–20kHz) |
| Audio | Frequency Response | 20Hz–20kHz, ±0.5dB @ 4Ω, 8Ω, 70V, 100V; −2.5dB @ 20kHz at 2Ω |
| Audio | Signal-to-Noise Ratio | 105dB (20Hz–20kHz, ref 8Ω) |
| Audio | Crosstalk | 70dB (20Hz–20kHz) |
| Audio | Output Class | Class-D with Smart Power Bridge |
| Inputs | Analog | 4 balanced inputs, 26dB / 34dB selectable sensitivity |
| DSP | Processor | Analog Devices Sigma 96kHz, 32-bit core with sample rate converters |
| DSP | Input Routing | Routable matrix — any input to any output, primary/secondary priority |
| DSP | Crossover | Up to 48dB/octave IIR (Linkwitz-Riley and Butterworth) |
| DSP | Parametric EQ | 8-band per channel |
| DSP | Output Delay | Up to 100ms per channel |
| DSP | Limiting | User-adjustable peak and RMS voltage limiting |
| DSP | Load Monitoring | Real-time load monitoring and pilot tone detection (internal or external) |
| DSP | Protection | DC, VHF, AC mains, over-temperature, current limiter, fan fault detection |
| Control | Interface | Browser-based Web UI, LEA Cloud, 3rd-party API (TCP / WebSocket) |
| Control | External I/O | In: remote on/off; Out: amplifier health status |
| Power | AC Mains | 100–240VAC ±15%, 50/60Hz |
| Power | Supply Type | Universal switch-mode with Power Factor Correction |
| Physical | Dimensions (L x W x H) | 14.25" x 19" x 1U (362mm x 482mm x 1U) |
| Physical | Weight | 14 lbs / 4 kg (net); 18.7 lbs / 8.5 kg (shipping) |
| Physical | Cooling | Front-to-rear variable speed fan (50dB idle / 57dB @ 50% / 63dB full speed @ 1m) |
Frequently Asked Questions
Q: What is the difference between the CS704 and CS704D?
The CS704 is the Network Connect Series model with analog balanced inputs and Ethernet/Wi-Fi control. The CS704D adds native Dante audio transport, allowing digital audio to be routed over the network alongside control data. Choose the CS704 for analog-input systems or where Dante is not part of the infrastructure; choose the CS704D when the facility uses a Dante audio network.
Q: Can the CS704 drive 70V distributed speaker systems?
Yes. Each channel can be independently configured for 70V or 100V constant-voltage (HiZ) operation for distributed speaker systems. Individual channels can also operate in low-impedance (LoZ) mode simultaneously, allowing the CS704 to serve both distributed and direct-drive loads from a single unit.
Q: How does the Smart Power Bridge work on the CS704?
Smart Power Bridge is LEA's proprietary technology that allows any single channel to be bridged for approximately double the output power without removing another amplifier channel from service. On the CS704, a bridged channel operates at higher power for demanding speaker loads while the remaining three channels continue normal operation. This is different from conventional bridging, which typically reduces the total number of available channels.
Q: What third-party control systems does the CS704 work with?
The CS704 supports an open API via TCP and WebSocket protocols, with pre-built control drivers and plugins available for Crestron, Extron, Q-SYS, AMX, Utelogy, and other systems. LEA provides a downloads library with current control files. The unit can also be managed through its browser-based Web UI or LEA Cloud without any third-party control system.
Q: What DSP processing is available on the CS704?
The onboard Analog Devices Sigma 96kHz DSP provides: a fully routable input matrix, up to 48dB/octave IIR crossover filters (Linkwitz-Riley and Butterworth), 8-band parametric EQ per channel, user-adjustable peak and RMS limiter, up to 100ms output delay per channel, real-time load monitoring, and pilot tone detection from internal or external sources.
Q: What speaker tuning files are available for the CS704?
LEA provides a free library of over 3,000 speaker tuning files for brands including JBL, Bose, Sonance, QSC, Klipsch, Martin Audio, Renkus-Heinz, and many others. These files are downloadable from the LEA Professional downloads library and can be imported directly into the amplifier via the Web UI.
Q: What is the warranty on the CS704?
LEA Professional offers a 5-year warranty internationally. U.S. customers who register their product receive a 6-year extended warranty. Contact your regional distributor for country-specific warranty coverage details.
At Creartion Networks, we do everything we can to create an excellent customer experience. This includes fast shipping and easy returns.
- Most in-stock orders placed Monday-Friday ship within 24-48 hours. General restrictions apply; please see our full shipping policy here.
- We offer a 30-day return policy from the delivery date on many products. Product restrictions apply. Restocking fees for the return of open-box items. Please see our full return policy here for more information.
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