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JBL Synthesis SMA-4750 and SMA-8300 Amplifiers are Now Available in North America

Lots of power, bridgeable configuration options, and rack-compatible sizes add flexibility to any custom home theater setup.

JBL Synthesis SMA-8300 and SMA-4750 Stacked

We first saw the JBL Synthesis SMA Series Amplifiers at the Harman Luxury Audio Group exhibit at the 2024 CEDIA Expo, but at that time it was indicated that they would be released in 2025. Since they have been released in select overseas markets, but are now available for North American consumers. 

The SMA Series amplifiers are designed for residential custom installation customers.   

The SMA-4750 and SMA-8300 are Class D multichannel DSP amplifiers designed to deliver high-power output and accommodate multi-channel and multi-room systems. With advanced features like bridgeable channels, full input and output Hi-Resolution DSP, and DANTE / AES67 digital audio networking, these amplifiers are intended to be go-to options for powering large LCR, surround, and height channel loudspeakers, as well as subwoofers in JBL Synthesis immersive audio systems.

Both models feature a compact, stackable design with quiet side-to-side ventilation. The comprehensive DSP platform offers EQ, Delay, and Limiters. This provides installers and users with lots of installation and audio setup flexibility.

Each model also has a front panel user interface/status display that provides a simplified control option if desired. 

JBL Synthesis SMA-4750 Rear View
SMA-4750

SMA-4750: This is a 4-channel amplifier that provides 750W per channel at 8 ohms, with the capability to bridge adjacent channels to provide up to 1,800W at 8 ohms. 

SMA-8300: This is an 8-channel amplifier that provides 300W per channel at 8 ohms, with bridging options that allow up to 1,200W per channel at 8 ohms. The SMA-8300 is designed for more expansive systems, supporting a wider range of speaker setups than the SMA-4750. 

JBL Synthesis SMA-8300 Rear View
SMA-8300

Comparison

SMA-4750SMA-8300
Product Type4-channel Bridgeable Class D Amplifier 8-channel Bridgeable Class D Amplifier 
Price$5,000$6,000
InputsAnalog audio input
Digital audio input (Dante/AES67)  2x RJ45
8x XLR (Balanced)
Digital audio input (Dante/AES67)  2x RJ45
OutputBinding Posts, accommodates 10AWG wire, spade, and banana termination Binding Posts, accommodates 10AWG wire, spade, and banana termination 
12 Volt Trigger1x 3.5mm (in)
1x 3.5mm (out)
1x 3.5mm (in)
1x 3.5mm (out)
Network/Monitoring Control1x RJ45 1x RJ45 
PowerStandard IECStandard IEC
Power Output (2 channels driven, <0.5% THD)(8Ω)  750W
(4Ω) 1,500W 
(8Ω Bridged, one zone driven) 2,500W
(8Ω)  300W
(4Ω) 600W 
(8Ω Bridged, one zone driven) 1,200W
Digital Signal Processing96kHz, 32-bit floating point96kHz, 32-bit floating point
Frequency response (+-0/5 dB)(4Ω) 20Hz – 20kHz(4Ω) 20Hz – 20kHz
Total Harmonic Distortion (THD)  (at full rated power, from 20Hz – 20kHz)  0.35%0.35%
Analog Input SNR Signal-to-Noise-Ratio (ref. Rated power, ‘a’-wtd.) >105dB>105dB
Analog Input SNR Signal-To-Noise Ratio (ref. Rated power, 20Hz – 20kHz) >99dB >99dB 
Damping Factor (20Hz to 100Hz) >1000>1000
Input Impedance (nominally balanced, nominally unbalanced) 70 kΩ balanced, 35 kΩ unblanced 70 kΩ balanced, 35 kΩ unblanced 
Maximum input level (low amp gain mode) +21dBU +21dBU 
Load impedance (Stereo/Dual Mode)2Ω –16Ω load2Ω –16Ω load
Impedance (Bridged Mono) 4Ω – 16Ω  4Ω – 16Ω  
Maximum fan noise (REF. dB SPL @ 1M)  51dBA51dBA
Power supply 100 – 220V ±10%, 50/60Hz100 – 220V ±10%, 50/60Hz
Dimensions incl. rack ears, connectors, controls (HWD) 3.5 x 19.0 x 17.0 in 
88.9 x 482.6 x 432.6 mm 
3.5 x 19.0 x 17.0 in
88.9 x 482.6 x 432.6 mm 
Net Weight 21.8 lb (9.9 kg) 23.1 lb (10.5 kg)
In The Box1x JBL Synthesis SMA-4750
1x Quick-start guide and safety sheet
Rackmount brackets and fastening screws
 AC Power Cord(s) – quantity and type vary by region
1x JBL Synthesis SMA-8300
1x Quick-start guide and safety sheet
Rackmount brackets and fastening screws
 AC Power Cord(s) – quantity and type vary by region

From Jim Garrett, Senior Director, Product Strategy and Planning, HARMAN Luxury Audio: “Designed to elevate home cinema experiences, the new JBL Synthesis SMA Series amplifiers set a new benchmark for power, flexibility, and performance,…These amplifiers are designed to deliver exceptional power and audio fidelity, making them a perfect fit for any high-end home audio system. They embody our commitment to innovation and home cinema audio expertise.

JBL Synthesis SMA-4750
JBL Synthesis SMA-4750

The Bottom Line

The CI category really took off during the COVID pandemic for the simple reason that consumers had no live music options and movie theaters were shuttered across North America. Home theaters exploded in popularity and consumers with larger budgets began experimenting with multi-room audio systems throughout their homes and even outdoors.

That level of expansion requires more channels of amplification and music listeners and home theater fans who opted for JBL Synthesis loudspeakers are probably looking to improve on what they already have.

The JBL SMA Series amplifiers are designed to provide a flexible option, especially when paired with JBL Synthesis SCL series speakers and SSW series subwoofers.

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JBL Synthesis SMA-8300
JBL Synthesis SMA-8300

Price and Availability

The JBL Synthesis SMA-4750 and SMA-8300 are priced at $5,000 and $6.000 respectively and are available through Authorized Dealers.

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