Stetsom HL 400.4 Class D Full Range Amplifier 4 Channel 400 Watts, RCA Input and High Wire Input, Variable Crossover
Many in-stock orders ship within 1-2 business days, but timing varies by item. Custom, built-to-order, oversized, special-order and supplier-direct products may need extra processing time. Free shipping applies to qualifying orders over $99 in the contiguous US. Approved returns may be subject to a restocking fee.
Most products are covered by the manufacturer's warranty against defects. Damage from over-powering or improper installation isn't covered — we'll help coordinate any valid claim.
Tell us your vehicle, subwoofers and electrical setup and our team will help you match the right gear. Reach out before you buy.
Subwoofer Wiring Diagram
Select your configuration to view possible wiring combinations.
Loading wiring diagrams…
Diagrams are on our wiring diagram page.
The HL 400.4 Class D Full Range Amplifier 4 Channel 400 Watts brings Stetsom's Brazilian-engineered car audio performance to your build. Delivering 400W RMS, it pairs efficient Class D power with reliable protection for clean, hard-hitting sound.
Overview
Developed for those seeking high performance and sound fidelity in automotive amplifiers.
The HL400.4, is a 400W RMS product with 4 CHANNELS and great installation versatility.
It offers independent front and rear channels such as LEVEL to adjust the input signal level and Crossover, allowing you to choose between LOW-PASS, HIGH-PASS or FLAT (FULL-RANGE) operation.
Specifications
| RMS Power | 400W RMS |
| Amplifier Class | Class D |
| Channels | 4 |
| Operation | Full-Range |
This listing includes: (1) HL 400.4 Class D Full Range Amplifier 4 Channel 400 Watts.
Authentic Stetsom, shipped fast from JS Ultimate Sounds — your authorized dealer.
