JBL Synthesis SMA-4750
Best high-performance amplifier for custom immersive home theater installations.
The JBL Synthesis SMA-4750 is a powerful and versatile 4-channel Class D amplifier designed for immersive audio systems. It delivers 750W per channel into 8 ohms, with the ability to bridge adjacent channels for 2,500W into 8 ohms, making it ideal for LCR, surround, and height channels, as well as subwoofers. This amplifier features advanced DSP for custom loudspeaker tuning and full external control for seamless system integration. Its compact, stackable design with quiet ventilation ensures easy installation in custom setups. The SMA-4750 offers high-resolution DSP, including EQ and Delay, providing precise control for audiophiles and professional installers.
$4999.00
Owner Satisfaction
4.7
/ 5
Category Rank
421
/ 1719
#421 in Power Amplifiers
Price vs Category Average
-39%
Below average
Model
4750
/ SMA-
Who it's for
- Home cinema enthusiasts seeking theater-grade dynamics and pristine audio fidelity
- JBL Synthesis owners looking for seamless system integration and calibration
- Serious audiophiles prioritizing long-term reliability and premium build quality
Who should skip it
- Budget-conscious buyers seeking entry-level or mid-range audio solutions
- DIY installers who prefer a simple, plug-and-play setup experience
- Homeowners with limited rack space or restricted ventilation options
Performance breakdown
Power Density
Massive output capabilities packed into a compact, rack-friendly chassis.
DSP Precision
High-resolution 96kHz processing offers surgical control over complex speaker arrays.
System Integration
Dante and AES67 support ensure seamless connectivity in modern digital ecosystems.
Load Versatility
Bridgeable channels handle demanding subwoofer and LCR configurations with ease.
Thermal Management
Quiet ventilation keeps performance stable during extended high-output listening sessions.
Signal Fidelity
High damping factor and low noise floor ensure clean, authoritative sound reproduction.
Key Specs
Model
SMA-4750
Analog audio input
4x XLR (Balanced)
Digital audio input (Dante/AES67)
2x RJ45
Speaker output
Binding Posts, accommodates 10AWG wire, spade, and banana termination
12VDC trigger control
1x 3.5mm (in), 1x 3.5mm (out)
Network/Monitoring/Control
1x RJ45
Power
Standard IEC
Power (2 channels driven, <0.5% THD), Rated Power (8Ω)
750W
Features
- Versatile 4-channel Class D power amplifier
- Bridgeable channels for increased power output
- Powerful built-in DSP for custom loudspeaker tuning
- Full external control for easy system integration
- Compact and stackable design with quiet ventilation
- High-resolution DSP suite including EQ, Delay, and Limiters
- DANTE / AES67 digital audio networking capability
What customers say
Customers consistently praise the JBL Synthesis SMA 4750 for its exceptional audio performance and robust build quality. Reviewers frequently highlight the amplifier's ability to deliver clear, powerful sound, creating an immersive listening experience. The premium construction and attention to detail also receive high marks, reinforcing its status as a top tier audio component. While a significant investment, many users feel the unparalleled sound reproduction justifies the cost, making it a standout choice for serious audiophiles seeking uncompromising quality.
Know before you buy
Yes, you can bridge adjacent channels to increase the output to 2,500W into 8 ohms. This makes the amplifier highly versatile for driving demanding subwoofers or high-output LCR speakers.
Yes, the SMA-4750 features Dante and AES67 digital audio networking capabilities via dual RJ45 ports. This allows for seamless integration into modern, high-performance audio systems.
The binding posts are designed to accommodate 10AWG wire, as well as standard spade and banana plug terminations. This provides flexibility for various installation requirements.
Yes, the amplifier includes a high-resolution 96kHz, 32-bit floating-point DSP suite. It allows for precise control over EQ, delay, and limiters to optimize your loudspeaker performance.
The amplifier is designed with quiet ventilation, featuring a maximum fan noise level of 51dBA at 1 meter. This makes it suitable for custom rack installations where noise management is a priority.
Absolutely. The SMA-4750 includes 12VDC trigger inputs and outputs for power management, along with dedicated network monitoring and control ports for full external system integration.
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