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JL Audio HD1200/1 (Open Box, Great)

1200W RMS Class D HD Series Monoblock Car Amplifier

JL Audio
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• 1200 watts x 1 channel @ 4 ohm
• 1200 watts x 1 channel @ 2 ohm
• Total RMS Power: 1200 watts
• Class D 1.5 ohm Stable Monoblock Amplifier

Learn more about the ls-hd12001-u8
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Product Highlights


• 1200 watts x 1 channel @ 4 ohm
• 1200 watts x 1 channel @ 2 ohm
• Total RMS Power: 1200 watts
• Class D 1.5 ohm Stable Monoblock Amplifier

Description


JL Audio brand icon

Authorized dealer

Item Condition - Open Box, Great:

This product works like new, is well-cared-for and in great condition. May show limited signs of wear or use and may be missing non-essential parts, accessories or original packaging.

Monoblock Class D Subwoofer Amplifier

The JL Audio HD1200/1 is the most powerful monoblock amplifier in the flagship HD series, designed to deliver massive, competition-grade power from a chassis roughly the size of a sheet of computer paper. It utilizes JL Audio’s advanced Single-Cycle Control and R.I.P.S. (Real-Time Intelligent Power Supply) to provide 1200W of clean, consistent power to your subwoofers, regardless of vehicle voltage fluctuations or load impedance.

The HD1200/1 is a "wide-range" monoblock, meaning that while it is primarily used for subwoofers, it has the fidelity and frequency response to drive high-performance mid-range speaker systems if needed. Its R.I.P.S. technology is a standout feature, ensuring that you get the full 1200W of power whether you are running a 1.5 ohm or 4 ohm load.

Product Details:

  • HD Series Class D 1.5 ohm Stable Monoblock Amplifier
  • RMS Power Rating:
    • 4 ohm: 1200 watts x 1 channel
    • 2 ohm: 1200 watts x 1 channel
  • Total RMS power output: 1200 watts
  • LED Power/Protect Light
  • Speaker-level (high-level) inputs (Requires adapter like the Kicker KISL)
  • 1 pair of pre-amp outputs
  • 3-way protection circuitry (thermal, overload, and speaker short protection)
  • Delivers exceptional audio quality with reduced current draw and heat
  • Selectable 12-decibel/octave (Butterworth) or steep 24-decibel/octave (Linkwitz-Riley)
  • Feature advanced rollback protection
  • Brushed aluminum finish with black powder-coat cast
  • Black powder-coated gasketed cover provided
  • Removable power and speaker plugs
  • RealSink chassis and vertical cast-alloy fins to dissipate heat effectively
  • RIPS (Regulated, Intelligent Power Supply) technology to adjust amplifier's operation
  • Single cycle control technology
  • Optional remote level controller (sold separately)
  • Offers flexible mounting options via optional stacking kits
  • Optional stacking kit (sold separately)
    • Low level: 0.2 - 2 volts
    • High level: 0.8 - 8 volts
  • Frequency Response: 6 - 8000 Hz
  • Total Harmonic Distortion (THD): 0.03%
  • Signal to Noise Ratio: >110 dB
  • Variable low-pass filter: 50 - 500 Hz
  • Subsonic filter: 0 - 30 Hz
  • Fuse Rating: 100A (AFS, AGU or MaxiFuse)
  • 2 AWG gauge amplifier wiring kit is recommended for installation
  • Dimensions: 10-13/16" L x 8-13/16" W x 1.93" H
  • Authorized Internet Dealer
  • 2 Year Manufacturer's Warranty
  • MFR #: HD1200/1

Frequently Asked Questions (FAQ)


This is due to JL’s Single-Cycle Control and R.I.P.S. technology. The amp automatically adjusts its internal rail voltage to deliver a consistent 1200W RMS regardless of the speaker impedance (between 1.5 and 4 ohms).
No. This is a "low voltage" warning. The HD1200/1 is highly efficient but requires a steady power supply. Check your battery and ground. If the voltage drops below 10V during a bass hit, the amp will flash this code to protect itself.
Solid Red indicates a thermal or short-circuit fault. Turn off the system and check for a speaker wire touching the car's metal frame. Ensure the amp has at least 1 inch of clearance; it uses its outer "sink" to dissipate heat.
If you have a ported (vented) box, use the 24dB (steeper) setting at roughly 30Hz. This prevents the subwoofer from "over-excursion" (moving too far) below the tuning frequency, which can snap the woofer's suspension.
Yes. The HD series is designed for "Stacking." You must use the JL Audio HD Stack Kit (sold separately). This provides the necessary air gap and secure bolting points to ensure both amps stay cool while mounted together.
Check the "Input Voltage" switch. If set to "High" while using a standard low-voltage RCA output from an aftermarket radio, the signal will be too weak. Switch it to "Low" to match the head unit’s RCA signal level.
Not necessarily. If you use the speaker-level inputs, you can set the "Turn-On Mode" to "Signal" or "DC Offset." The amp will "sense" the audio from your factory wires and turn on automatically without a separate 12V remote lead.
You must use 4 AWG 100% pure copper (OFC) wire and a 100A fuse. Do not use "CCA" (aluminum) wire; the HD1200/1 draws significant current, and cheap wire will cause it to overheat or enter protection mode.

Specifications & Details


Key Features
Amplifier Key Features
Speaker Level Inputs
Power Specifications - Subwoofer Channel
RMS Power @ 4 ohms
1200 watts x 1 channel
RMS Power @ 3 ohm
1200 watts x 1 channel
RMS Power @ 2 ohms
1200 watts x 1 channel
RMS Power @ 1.5 ohm
1200 watts x 1 channel
Amplifier Specifications
Series
HD Series
Amplifier Class
D
Number of Channels
1 - Mono
Total RMS Power Output
1200 watts
Maximum Input Gauge Size
2 AWG
Minimum Impedance Unbridged
1.5 ohm
Minimum Impedance Bridged
Not Bridgeable
Frequency Response
6 - 8000 Hz
THD at Rated RMS Power
0.03%
Speaker Level Inputs
Yes
Preamp Outputs
1 pair
Built-in Crossover
Low-Pass (LP)
High-Pass (HP)
Subsonic
High-Pass Crossover Frequency
50 - 500 Hz
Low-Pass Crossover Frequency
50 - 500 Hz
Subsonic Filter
0 - 30 Hz
Signal-to-Noise Ratio
>110 dB
Remote bass/level controller
Optional (Accessory required and sold separately)
Fuse Rating
100A x 1 
Total Fuse Rating
100
Strappable
No
Amp Bluetooth Connectivity
No
Hi-Res Certified
No
Low-Level Input Sensitivity
0.2 - 2 volts
High-Level Input Sensitivity
0.8 - 8 volts
What is in the box?
Paperwork
User manual
Warranty/Registration card
Brand sticker/decal
WITB: Amplifiers
Amplifier
Mounting screws (4)
Allen wrenches (2)
Other Accessory #1
Power input plug
Other Accessory #2
Speaker connection plug(s)
Other Accessory #3
Mounting feet (4)
Warranty and Return Policy
Parts Warranty Duration
2 years
Labor Warranty Duration
2 years
Warranty Provider
Manufacturer

Item Details


Manufacturer:

Model Number:

HD1200/1

Weight:

9.40lbs

Internal SKU:

ls-hd12001-u8

Internal Product ID:

231848

Product and How-to Videos


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