Sundown Audio Horizon HZ-900.5 900 Watt 5-Channel Amplifier
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.
%20%E2%80%94%20100W%20x4%20@%204%CE%A9%20/%20150W%20x4%20@%202%CE%A9%0A%0ARMS%20Power%20(CH5%20Sub)%20%E2%80%94%20200W%20@%204%CE%A9%20/%20500W%20@%202%CE%A9%0A%0AClass%20%E2%80%94%205-channel%20full-system%20amplifier%20(mids/highs%20+%20dedicated%20sub)%0A%0AFilters%20%E2%80%94%20HPF%20on%20CH1-4,%20LPF%20and...
){kind=link}
- RMS Power (CH1-4) — 100W x4 @ 4Ω / 150W x4 @ 2Ω
- RMS Power (CH5 Sub) — 200W @ 4Ω / 500W @ 2Ω
- Class — 5-channel full-system amplifier (mids/highs + dedicated sub)
- Filters — HPF on CH1-4, LPF and subsonic on CH5
- Protection — Sundown 4-way protection with DC Sense and high-level input
This Listing Includes: (1) Sundown Audio Horizon HZ-900.5 5-Channel Amplifier
The Horizon HZ-900.5 is Sundown's all-in-one solution for full-system amplification, with four channels for mids and highs and a separate subwoofer channel. CH1-4 deliver 100W x4 @ 4Ω or 150W x4 @ 2Ω, while CH5 pushes 200W @ 4Ω or 500W @ 2Ω. Independent crossovers give you a high-pass filter (27Hz–250Hz) on CH1-4 plus low-pass (50Hz–250Hz) and subsonic (10Hz–50Hz) filtering on CH5. DC Sense, high-level input capability, and 4-way protection make it ideal for daily drivers and stealth builds where space matters. Authorized Sundown Audio dealer at JS Ultimate Sounds. Free shipping on orders $99+.
Features
- Four full-range channels plus a dedicated subwoofer channel
- High-pass filter on CH1-4 (27Hz–250Hz)
- Low-pass and subsonic filters on CH5
- DC Sense and high-level input for factory integration
- Sundown 4-way protection circuit
Specifications
| RMS Power CH1-4 | 100W x4 @ 4Ω / 150W x4 @ 2Ω |
| RMS Power CH5 (Sub) | 200W @ 4Ω / 500W @ 2Ω |
| High Pass Filter (CH1-4) | 27Hz – 250Hz |
| Low Pass Filter (CH5) | 50Hz – 250Hz |
| Subsonic Filter (CH5) | 10Hz – 50Hz |
| Input Sensitivity | 6V Max |
| Signal-to-Noise Ratio | 95dB |
| Fuse Rating | 100A |
| Dimensions | 11.25" x 4.63" x 2.2" |
| Weight | 4.12 lbs (1.87 kg) |
