DD Audio D4.125 D Series 4 Channel Amplifier
DD Audio D4.125 D Series 4 Channel Amplifier
DD Audio D4.125 D Series 4 Channel Amplifier
DD Audio D4.125 D Series 4 Channel Amplifier

DD Audio D4.125 D Series 4 Channel Amplifier

Regular price$429.00

  • Free shipping*
  • In stock, ready to ship
  • Inventory on the way
Snap Logo Lease for as low as $/week Learn More



In many of today’s installs, wattage per square inch is a deciding factor on what amplifier gets the job. For the D4.125, DD’s engineers were able to take the existing D4.100a’s compact chassis, which is only 7” x 4” x 1.7”, and increase the total output by 20%. The D4.125 can cleanly produce 200 watts per channel for a staggering 800 watts of total power. Beyond its amazing power to size ratio this amp is packed with features not normally seen on amplifiers in this size and price category.

The D4.125 also has conformal coated internal components and sealed back switches making it perfect for motorcycle, boat, and powersport applications. As if this amp didn’t have enough going for it, DD also has a line of made for Harley Davidson brackets that allow the D4.125 to cleanly and securely mount into 2014 and up Harley Road Glides and Street Glides.


  • Bandpass Crossovers
  • Clipping Indicators
  • Input Mode
  • Auto Turn On
  • Set Screw Power Connections
  • Set Screw Speaker Connections
  • Differential RCA Inputs
  • Discrete Outputs

D4.125: 800 Watt – 4 Channel Amplifier

Operating Voltage: 9 - 16
Test Voltage: 14.4
Output Channel(s): 4
Continuous Wattage @4ohm: 4 x 125 / 2 x 400
Continuous Wattage @2ohm: 4 x 200
Max Current Draw (Amps): 80
RCA Input Voltage Sensitivity: 8 - 0.2
RCA Input S/N: > 90dB
Damping Factor: > 100
THD: < 0.2%
Frequency Response (Hz): 30 - 30k
Sub-Sonic Filter: 30 - 5k
Low-Pass Filter: 50 - 5k
Pass Thru Output: No
Power Wire Gauge: 4
Speaker Wire Gauge: 12
Dimensions (Inches): 7 x 4 x 1.7
Dimensions (MM): 180 x 104 x 43
Price (USD): 429 each

As soon as your item is ready to ship you will receive an email with tracking information. We use FedEx, UPS and YRC Freight for all shipments.

*Shipping is free in the lower 48 states, unless otherwise stated.

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.


Gately Acrylic

We are dedicated to building unique and beautiful enclosures that sound as good as they look.