SounDigital Amplifier
- 4 channel Class D amplifier, 400 watts maximum output
- 4x125 watts RMS at 14.4V into 2 ohm
- 2x200 watts RMS bridged into 4 ohm at 14.4V
- 8 to 16 volt operating range, 39 A maximum draw
- 20 A fuse recommended for music use
- 4.33 x 4.33 x 1.97 inches, compact body
- 82% efficiency, 88 dB signal to noise
Last refreshed Oct 2, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A very small Class D amplifier with four outputs and a bridging option. Rated power changes with the electrical setup and the load, so check the figures against your system before buying.
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ASIN: B09BZ8PNVRModel: 400.4 EVO 4.0Category: Amplifiers
Overview
A car audio installer gets four Class D channels from SounDigital's EVO line in a body small enough for tight mounting spots. The channels can run four speakers or be bridged into two stronger outputs, with built-in crossovers for high-pass and low-pass duty.
The small footprint and the bridging option let one amplifier cover either a multi-speaker setup or a pair of louder channels. The rated output shifts with the electrical setup and speaker load, and the listing gives no weight, so plan the fit and the wiring around the stated figures.
Who it's for
An installer with limited mounting space who wants to drive four speakers or two bridged channels from a single unit. Buyers who need a mono subwoofer amplifier or a home audio amplifier should look elsewhere.
Pros and cons
- Four Class D channels in a small body
- Bridgeable into two stronger channels
- Built-in high-pass and low-pass crossover
- Wide supply voltage range
- Rated output varies with voltage and load
- Weight not listed
- Warranty terms not listed
Performance notes
Class D design wastes little power as heat, which is why the body can stay small. Output rises with supply voltage and falls as speaker impedance rises, so the same amplifier delivers different numbers in different installs. The built-in crossover filters the signal before it reaches the speakers.
Specifications
| Model | 400.4 EVO 4.0 |
|---|---|
| Dimensions & fit | |
| Item dimensions | 4.33 x 4.33 x 1.97 inches |
| Capacity & performance | |
| Maximum output power | 400 watts |
| Output power | 4 x 125 watts |
| Bridged RMS output (14.4V, 4 ohm) | 2 x 200 watts |
| Signal to noise ratio | 88 dB |
| Power & efficiency | |
| Maximum supply voltage | 16 volts |
| Minimum supply voltage | 8 volts |
| Included components | |
| Included components | Amplifier and manual |
| Other details | |
| Number of channels | 4 |
| Frequency response | 10 Hz to 20000 Hz |
| Supply current | 39 A |
| Crossover | 80 Hz high-pass and low-pass, 12 dB |
Frequently asked questions
How is the SounDigital 400.4 EVO installed?
The listing covers electrical limits only: an operating range of 8 to 16 volts, a 39 A maximum draw and a recommended 20 A fuse for music. It lists an amplifier and a manual in the box and gives no mounting or wiring kit.
Can the SounDigital 400.4 EVO be bridged?
Yes. The description gives a bridged rating of 2x200 watts RMS into 4 ohm at 14.4V.
Does the SounDigital 400.4 EVO drive a subwoofer?
It is a four channel amplifier, not a mono subwoofer amplifier. The listing shows a low-pass crossover setting, but it does not describe a dedicated subwoofer channel.