Horizon Amplifiers

Sundown Audio HZ-600 | Horizon Series 600W RMS Monoblock Amplifier Compact. Capable. Confident.If you're looking for reliable bass power in a tight package, the HZ-600 delivers. Designed for efficiency and durability, this Class D monoblock amplifier pushes up to 600 watts RMS at 1 ohm, giving you clean, controlled output ideal for daily setups, budget builds, or adding a dedicated sub channel to your system. It's a true performer, offering more power than its size suggests — and doing it with Sundown's trusted engineering. The HZ-600 features high-level input capability and DC Sense turn-on, making it perfect for factory integration or aftermarket installs where space is tight, but quality still matters. A built-in 12dB/octave low pass filter and subsonic filter give you precision control over your frequency range, while the 4-way protection circuit keeps your system safe from voltage issues, short circuits, thermal overload, and DC offset. And with the included wired remote, you get easy control of bass levels from the driver's seat. Whether you're pushing a single sub or upgrading a factory system with a small footprint, the HZ-600 is built to deliver serious performance with no wasted power, no added fluff — just pure bass, clean and simple. Specs: RMS Power @ 14.4V• 1 Ohm: 600W• 2 Ohm: 450W• 4 Ohm: 250W Low Pass Filter: 50Hz – 250Hz (12dB/Oct) Subsonic Filter: 10Hz – 50Hz (12dB/Oct) Input Sensitivity: Up to 6V Signal-to-Noise Ratio: 95dB Operating Voltage: 10.5V – 16.5V Fuse Rating: 60A Dimensions (LxWxH): 9" x 4.63" x 2.2" Weight: 2.78 lbs (1.26 kg) Wired Remote Bass Knob Included

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Sundown Audio HZ-1000 | Horizon Series 1000W RMS Monoblock Amplifier Powerful. Precise. Built to Perform.The HZ-1000 is everything a mid-tier mono amplifier should be — refined, reliable, and ready to deliver 1000 watts of clean RMS power at 1 ohm. Whether you're upgrading your daily driver, adding a second amp to your system, or running a single sub with serious authority, this Horizon Series amp brings the power you need without the bulk or complexity you don’t. Optimized for real-world installs, the HZ-1000 includes high-level input compatibility, DC Sense for factory integration, and a variable subsonic and low pass filter to keep your low-end crisp and controlled. Its 4-way protection circuit monitors heat, voltage, shorts, and offset, so you can push your system harder without stressing your equipment. The included remote bass knob makes real-time adjustment simple — dial it up when the bass drops, or fine-tune your system from the front seat. From sealed to ported enclosures, factory to custom setups, the HZ-1000 gives you versatility and strength in a compact Class D platform that’s easy to install and built to last. It’s the definition of clean power, simplified. Specs: RMS Power @ 14.4V• 1 Ohm: 1000W• 2 Ohm: 700W• 4 Ohm: 350W Low Pass Filter: 50Hz – 250Hz Subsonic Filter: 10Hz – 50Hz Input Sensitivity: 6V Max Signal-to-Noise Ratio: 95dB Fuse Rating: 100A Dimensions: 9.75" x 4.63" x 2.2" Weight: 3.42 lbs (1.55 kg) Wired Remote Included

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Sundown Audio HZ-1500 | Horizon Series 1500W RMS Monoblock Amplifier More Bass. More Control. All Sundown.Designed for bigger builds and subwoofers that demand more, the HZ-1500 delivers up to 1,500 watts RMS at 1 ohm with low distortion and high efficiency. It’s the top dog of the Horizon Series mono lineup — made to push larger woofers or multiple drivers with clean, relentless power that stays cool and sounds tight. Like its smaller siblings, the HZ-1500 features a robust 4-way protection system, DC Sense, and high-level inputs, giving you full flexibility for installs in both factory and aftermarket environments. Tuning is simple and precise thanks to the onboard low pass filter, subsonic filter, and included wired remote bass knob. You’ll have full control of your low end, whether you’re cruising or competing. For builders and bass lovers who want one amp that hits hard, runs cool, and doesn’t take up half the trunk, the HZ-1500 is a no-brainer. It’s built the Sundown way — to deliver clean power, take abuse, and leave competitors in the dust. Specs: RMS Power @ 14.4V• 1 Ohm: 1500W• 2 Ohm: 800W• 4 Ohm: 450W Low Pass Filter: 50Hz – 250Hz Subsonic Filter: 10Hz – 50Hz Input Sensitivity: 6V Max Signal-to-Noise Ratio: 95dB Fuse Rating: 140A Dimensions: 11.25" x 4.63" x 2.2" Weight: 4.23 lbs (1.92 kg) Remote Bass Control Included

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Sundown Audio HZ-900.5 | Horizon Series 5-Channel Amplifier (900W RMS) Everything You Need. Nothing You Don’t.The HZ-900.5 is Sundown’s all-in-one solution for full-system amplification. With four channels dedicated to mids and highs and a separate subwoofer channel, this 5-channel amp offers up to 150W x4 @ 2 ohms on CH1-4, and 500W @ 2 ohms on CH5. It’s perfect for anyone who wants a single, clean install that powers an entire soundstage — from vocals to the deepest bass. Advanced crossovers let you independently dial in your full-range and subwoofer sections. You get high-pass filters for CH1-4, and both low pass and subsonic filters on CH5. Add in DC Sense, high-level input capability, and Sundown's bulletproof 4-way protection, and you’ve got one of the most versatile and powerful compact amps in its class. Ideal for daily drivers, stealth builds, or any vehicle where space matters but sound can't be compromised, the HZ-900.5 is as smart as it is strong. Specs: RMS Power @ 14.4V• CH1-4: 100W x4 @ 4Ω / 150W x4 @ 2Ω• 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)

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Sundown Audio HZ-80.4 | Horizon Series 4-Channel Full-Range Amplifier (80W x4) Versatility Meets Clarity.The HZ-80.4 is your go-to solution for adding clean, controlled power across your mids and highs. With 80 watts RMS x 4 channels at 4 ohms, it’s the perfect amp for speaker upgrades, active component setups, or small subwoofers that need headroom without the distortion. This amp runs cool and clean — and with its compact chassis, it fits just about anywhere. The Horizon Series amps don’t cut corners. This model includes adjustable high and low pass filters on all four channels, a full-range passthrough option, and high-level input capability to simplify factory integration. Run it passive or active — bridge it for bigger loads — the HZ-80.4 gives you maximum control and Sundown-grade output from a surprisingly small form factor. Whether you’re upgrading a factory system or building something fresh, the HZ-80.4 gives your sound system the foundation it needs to shine. Clean mids, crisp highs, tight control.  Specs: RMS Power @ 14.4V• 4 Ohm: 80W x4• 2 Ohm: 130W x4 High Pass Filter (CH1-4): 27Hz – 250Hz Low Pass Filter (CH1-4): 27Hz – 250Hz Input Sensitivity: Up to 6V Signal-to-Noise Ratio: 95dB Fuse Rating: 50A Dimensions: 7.4" x 4.63" x 2.2" Weight: 2.54 lbs (1.15 kg)  

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Sundown Audio HZ-100.4 | Horizon Series 4-Channel Full-Range Amplifier (100W x4) More Power. More Control. Better Sound.Step up your system with the HZ-100.4, Sundown’s high-output 4-channel amplifier that delivers 100 watts RMS per channel at 4 ohms — or 170W x4 at 2 ohms. Whether you’re powering component speakers, pro audio drivers, or full-range coaxials, the HZ-100.4 gives you headroom to push your gear harder, with less strain and more sonic clarity. This amplifier was made for audio lovers who want control. With fully adjustable HPF and LPF crossovers, you can run active or passive setups, bridge channels, or mix configurations. It’s built with high-level inputs, DC Sense, and 4-way protection, making it just as at home in factory integration as it is in custom builds. If you're ready to take your highs and mids from average to outstanding, the HZ-100.4 gives you the tools and the power to make it happen — all in one clean, efficient package.  Specs: RMS Power @ 14.4V• 4 Ohm: 100W x4• 2 Ohm: 170W x4 High Pass Filter (CH1-4): 27Hz – 250Hz Low Pass Filter (CH1-4): 27Hz – 250Hz Input Sensitivity: Up to 6V Signal-to-Noise Ratio: 95dB Fuse Rating: 60A Dimensions: 8.63" x 4.63" x 2.2" Weight: 2.93 lbs (1.33 kg)

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