Multi-Channel Power!


Sound Quality Rivaling Class AB Amps:

The SS4b is a discrete circuit full range class D amp that can crank out over  350 Watts per channel at 2-ohm stereo, with less than 1% THD+N. All this power fits into an SS chassis measuring only 6.875″ wide by 11.81″ long. By using discrete class D circuitry instead of a chipset we were able to get ultra-low distortion AND high power, contrary to the majority of small chassis class D amps on the market today. Not only does the sound quality of the SS amps trump other class D designs, they rival high-quality class AB designs.

Take the SS amp challenge, compare the sound of an SS amp to similar power class AB amps and you will experience the future of high efficiency AND high fidelity.


Like all DD amps, the circuit boards are conformal coated for use in high humidity and harsh mobile and marine applications.

SS amps feature individually selectable high pass and low pass crossovers with frequency bands from 50Hz-5kHz, making them adaptable to virtually any system configuration. We used heavy duty set screw blocks for speaker and power terminals and Tiffany RCA jacks to ensure connections are solid and durable.

SS amps are smaller, more powerful, generate less heat, and just sound better than other class D amps on the market. This makes them the ideal choice for today’s space cramped interiors.


Test Voltage 14.4
Channels 4
Cont Wattage @ 4ohm 250x4 / 700x2
Cont Wattage @ 2ohm 350x4
Max Current Draw - Amperage 110
S/N Ratio >105dB
Input Voltage Sensitivity 8 - 0.2
Pass-Through Output No
Remote Subwoofer Control Yes
Power Wire Guage In 4
Speaker Wire Gauge Out 10
Dimensions: in 11.81 x 6.88 x 2.14
Dimensions: mm 300 x 175 x 54.5
Shipping Weight - lbs 11
Price (USD) 689

Any DD Audio Product bearing the Marine Grade logo incorporates water resistant features enabling it to be used in applications where moderate exposure to moisture will not result in damage to the product. 

Marine Grade products are not waterproof, and submersion or excessive moisture exposure may result in product failure. DD Audio Marine Grade products are not certified for saltwater environments.

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