4-channel Class D power amplifier • 750W into 8Ω • 1,500W into 4Ω • 2,500W bridged into 8Ω • 96kHz/32-bit DSP • Dante/AES67 ready • balanced XLR inputs • 2U rack-mount design
The JBL SMA-4750 4 Channel Bridgeable Class-D Amplifier is a powerful and highly configurable multichannel amplifier engineered for premium JBL Synthesis home theater systems. Delivering up to 750 watts into 8 ohms or 1,500 watts into 4 ohms, the SMA-4750 provides the output and control required for demanding LCR speakers, surrounds, height channels, and high-performance subwoofer applications while occupying only 2U of rack space.
For systems requiring even greater output, adjacent amplifier channels can be bridged to deliver up to 2,500 watts into an 8-ohm load. An integrated high-resolution DSP suite provides EQ, delay, and limiter functionality, while balanced XLR inputs, Dante/AES67 digital audio networking capability, IP monitoring and control, 12V triggers, and robust binding-post outputs make the SMA-4750 particularly well suited to professionally designed and integrated immersive audio systems.
Key Features & Innovations
High-powered four-channel Class D amplification — the JBL SMA-4750 4 Channel Bridgeable Class-D Amplifier delivers up to 750 watts into 8 ohms or 1,500 watts into 4 ohms, providing substantial output capability for demanding JBL Synthesis loudspeakers and subwoofers.
2,500-watt bridged output capability — adjacent amplifier channels can be bridged to provide up to 2,500 watts into an 8-ohm load, making the SMA-4750 exceptionally flexible for high-power LCR and subwoofer applications.
96kHz / 32-bit floating-point DSP — high-resolution digital signal processing provides extensive control over the amplifier's input and output signals while maintaining the precision expected from a reference-level theater system.
Integrated EQ, delay & limiters — the onboard DSP suite allows professional integrators to fine-tune loudspeaker performance, timing, and protection parameters for the specific JBL Synthesis system and listening environment.
Dante / AES67 digital audio networking — networked digital audio capability enables compatible multichannel audio signals to be distributed over Ethernet, simplifying signal routing in advanced JBL Synthesis installations.
Balanced XLR analog inputs — four balanced XLR connections provide robust analog signal transmission and make the amplifier an excellent match for premium AV processors equipped with balanced outputs.
High damping factor — a damping factor greater than 1,000 from 20Hz to 100Hz gives the amplifier excellent electrical control over connected loudspeaker drivers, particularly in demanding low-frequency applications.
Custom-installation focused design — IP monitoring and control, 12V trigger input and output, rack mounting, flexible DSP configuration, and side-to-side cooling make the SMA-4750 well suited to professionally installed equipment racks.
Compact 2U chassis — despite its substantial power output, the amplifier occupies only two rack spaces, allowing multiple SMA amplifiers to be combined efficiently in high-channel-count immersive theater systems.
FAQ — JBL SMA-4750
How much power does the JBL SMA-4750 produce?
The SMA-4750 is rated to deliver 750 watts into 8 ohms or 1,500 watts into 4 ohms with two channels driven and less than 0.5% THD. An adjacent channel pair can also be bridged to deliver 2,500 watts into an 8-ohm load.
Can the SMA-4750 channels be bridged?
Yes. Adjacent amplifier channels can be bridged for substantially greater output. In bridged operation, the SMA-4750 is rated for up to 2,500 watts into 8 ohms, making it suitable for demanding high-power loudspeaker and subwoofer applications.
What types of speakers can the SMA-4750 power?
The SMA-4750 is designed for use with a wide range of JBL Synthesis loudspeakers. Depending on system requirements and configuration, it can power LCR speakers, surrounds, overhead or height speakers, and passive subwoofers.
Does the SMA-4750 include DSP?
Yes. The amplifier incorporates 96kHz, 32-bit floating-point digital signal processing with input and output DSP functionality including EQ, delay, and limiters. This allows an installer to optimize amplifier and loudspeaker performance for the specific system.
Does the SMA-4750 support Dante?
Yes. The SMA-4750 is Dante/AES67 ready and provides two RJ45 connections for digital audio networking. Dante functionality can be activated for compatible networked-audio installations.
Is the SMA-4750 rack mountable?
Yes. The amplifier is designed for standard 19-inch equipment racks and occupies 2U of rack space. Rack-mount brackets and fastening screws are included.
Why Buy From Us
Authorized JBL Synthesis dealer offering 100% genuine products with full manufacturer warranty coverage
Expert guidance on amplifier selection, channel configuration, speaker matching, and complete JBL Synthesis theater design
Professional installation, equipment-rack integration, DSP configuration, system calibration, and optimization services available
Dedicated customer support for setup, networking, control integration, upgrades, and troubleshooting
