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Gravity

Gravity 4000.1D Car Amplifier 4000W 1 Ohm Kit

Experience Powerful Bass with Precision ControlThe Gravity 4000.1D Class D Car Amplifier delivers exceptional bass performance with unmatched power and reliability. Designed for subwoofer enthusiasts, this monoblock amplifier includes a 4 Gauge Kit for easy installation. Specifications: 4000...

$249.99*
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*Price sourced from Amazon.com. Last updated:Oct 21, 2026.Price and availability are subject to change — details.

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Overview

Experience Powerful Bass with Precision Control

The Gravity 4000.1D Class D Car Amplifier delivers exceptional bass performance with unmatched power and reliability. Designed for subwoofer enthusiasts, this monoblock amplifier includes a 4 Gauge Kit for easy installation.

Specifications:

  • 4000W Max Class D @ 1 Ohm
  • Stable at 2 Ohm and 4 Ohm
  • S/N Ratio > 70 dB
  • Frequency Response: 8 Hz ~ 180 Hz
  • THD <0.2%
  • Bass Boost Level: 0 ~ 12 dB
  • LPF: 40 Hz ~ 180 Hz
  • Subsonic Filter: 0 ~ 50 Hz
  • High- and Low-Level Inputs
  • Dimensions: 11.3" x 8.3" x 2.5"

Key Features

POWERFUL - Gravity 4000.1D second-generation digital Class D monoblock amplifier delivers up to 4000 watts maximum output at 1 ohm, providing strong, focused bass performance for dedicated car audio subwoofer systems.

STABLE - Designed for 1-ohm operation and stable at 2 ohms or 4 ohms, this mono subwoofer amplifier gives installers flexible impedance options when matching compatible subwoofers and enclosure configurations.

TUNABLE - Adjustable bass boost from 0 to 12 dB, variable low-pass filter from 40 to 180 Hz, and subsonic filter from 0 to 50 Hz help tailor low-frequency response to the vehicle, music, and enclosure.

CLEAN - Built with a MOSFET power supply and rated at greater than 70 dB signal-to-noise ratio with less than 0.2% THD, supporting controlled bass reproduction with frequency response from 8 Hz to 180 Hz.

VERSATILE - High-level and low-level inputs allow integration with many aftermarket and factory-source audio systems, while the variable low-pass crossover and included remote bass knob provide convenient adjustment.

BUNDLE - Includes the Gravity 4000.1D monoblock amplifier, bass control knob, and a blue 4-gauge amplifier installation kit bundle. Compact amplifier dimensions measure 11.3 x 8.3 x 2.5 inches for flexible mounting.

Specifications

Max Power Output
4000W Class D @ 1 Ohm
Stable Impedance
1 Ohm, 2 Ohm, 4 Ohm
Signal-to-Noise Ratio
&gt; 70 dB
Frequency Response
8 Hz ~ 180 Hz
THD
&lt; 0.2%
Bass Boost Level
0 ~ 12 dB
LPF
40 Hz ~ 180 Hz
Subsonic Filter
0 ~ 50 Hz
Inputs
High and Low Level
Dimensions (L×W×H)
286 mm (11.3 in) × 211 mm (8.3 in) × 64.5 mm (2.5 in)
Included Accessories
Bass Knob, 4 Gauge Blue Bundle

Frequently Asked Questions

This Gravity car amplifier has a 4000W Max Class D output when operating at 1 Ohm.
Yes, it is stable at 1 Ohm, 2 Ohm, and 4 Ohm loads, offering versatility for speaker configurations.
Yes, a bass knob is included with the amplifier for convenient bass level adjustments.
The amplifier has a frequency response ranging from 8 Hz to 180 Hz.
It features variable low pass crossover, a variable bass boost from 0 to 12 dB, and a subsonic filter from 0 to 50 Hz.

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