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This Model Has Been Discontinued


Compact, powerful and efficient!


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The REDLINE SA Series amplifiers utilize the latest Class D topology to offer powerful output from an ultra compact chassis. Small space, big power, sizable savings.

The RL-SA300.4 is designed to be a go-to aftermarket upgrade amplifier for driving DD REDLINE Series coaxials and components. For added versatility, the rear channels can be bridged to drive a subwoofer providing a complete audio upgrade from a single amplifier!

With the ability to utilize either RCA Line Level or High Level inputs, the REDLINE SA Series amplifiers provide easy factory integration without the need for a line output converter or aftermarket head unit.

The REDLINE SA Series amplifiers are equipped with set screw power and speaker terminals offer secure and reliable connections usually reserved for higher end amplifiers.

Learn more about the DD REDLINE Series products.


  • Variable 12dB Crossovers
  • Class D Topology
  • Hi Level Inputs
  • Set Screw Power and Speaker Terminals

RL-SA300.4: 300 Watt – Small 4 Channel Amplifier

Operating Voltage: 10 - 16
Test Voltage: 14.4
Output Channel(s): 4
Continuous Wattage @4ohm: 4 x 65 / 2 x 120
Continuous Wattage @2ohm: 4 x 75
Dynamic Wattage: 600
Max Current Draw (Amps): 30
RCA Input Voltage Sensitivity: 6 - 2.5
High-Level Input Voltage Sensitivity: 20 - 1.1
RCA Input S/N: > 85
Damping Factor: > 70
THD: < 0.1%
Frequency Response (Hz): 10 - 30k
High Pass Filter: 35 - 250
Low-Pass Filter: 35 - 250
ZVL Input: No
Pass Thru Output: No
Power Wire Gauge: 4
Speaker Wire Gauge: 12
Dimensions (Inches): 7 x 3.8 x 1.69
Dimensions (MM): 180 x 96 x 43
Price (USD): 189 each

The REDLINE Series amplifiers are designed to be no frills, reliable mobile amplification solutions with all the savings! Available in a monoblock for your subs and a multi-channel for your mids and highs, these amplifiers are loaded with only the best name-brand components to give you big system power and performance. 

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We believe in supporting brick and mortar dealers and have carefully partnered with small businesses who can provide quality installation and customer satisfaction befitting DD AUDIO® equipment.

Check with your local dealer for stock and promotional discounts.