Name: JL Audio HD750/1 (Open Box, Good)
Brand: JL Audio
SKU: ls-hd7501-u7
Price: 629.99 USD
Availability: Discontinued

by JL Audio

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Product highlights

• 750 watts x 1 channel @ 4 ohm
• 750 watts x 1 channel @ 2 ohm
• Total RMS Power: 750 watts
• Class D 1.5 ohm Stable Monoblock Amplifier

Learn more about the ls-hd7501-u7

Product Highlights

• 750 watts x 1 channel @ 4 ohm
• 750 watts x 1 channel @ 2 ohm
• Total RMS Power: 750 watts
• Class D 1.5 ohm Stable Monoblock Amplifier

Description

Authorized dealer

Item Condition - Open Box, Good:

This product is used, but it will work like new and is in overall good condition. It will show signs of wear that can include scuffing, scratches, fingerprints, dents, and worn corners or installation marks. May be missing non-essential parts, accessories or original packaging.

HD750/1

This ultra-compact monoblock amplifier employs our Single-Cycle Control switching design and R.I.P.S. technology to deliver 750 W of clean power into any impedance between 1.5 and 4 Ω, giving you the highest degree of flexibility in designing your subwoofer system. Tight power supply regulation keeps distortion down and maximizes your bass quality. From a pure sound quality perspective, we invite you to compare the real-world, in-car performance of this amplifier to any other amplifier on the market, of any type, at any price. While targeted primarily to subwoofer applications, the HD750/1 is a wide-range amplifier and can also be used to drive high-performance mid-range speaker systems. This amplifier features a brushed aluminum finish with black powder-coated cast alloy heat sinks and bottom panel. A black powder-coated, gasketed cover is also provided to protect the controls.

Product Details:

HD Series Class D 1.5 ohm Stable Monoblock Amplifier
RMS Power Rating:

4 ohm: 750 watts x 1 channel
2 ohm: 750 watts x 1 channel

Total RMS power output: 750 watts
LED Power/Protect Light
1 pair of pre-amp outputs
Signal sensing remote turn-on
3-way protection circuitry (thermal, overload, and speaker short protection)
Brushed aluminum finish with black powder-coat cast
Black powder-coated gasketed cover provided
Removable power and speaker plugs
Optional wired remote JL Audio HD-RLC for level control (sold separately)
Optional stacking kit JL Audio HD_STACK_KIT (sold separately)
Input sensitivity:

Low level: 200mV - 2 volts
High level: 800mV - 8 volts

Frequency Response: 6 - 8000 Hz
Total Harmonic Distortion (THD): <0.03%
Signal to Noise Ratio: 111 dB
Variable low-pass filter: 50 - 500 Hz
Subsonic filter: 0 - 30 Hz
Fuse Rating: 60A
4 AWG gauge amplifier wiring kit is recommended for installation
Dimensions: 10-13/16" L x 8-13/16" W x 1-15/16" H
Authorized Internet Dealer
2 Year Manufacturer's Warranty
MFR #: HD750/1

Frequently Asked Questions (FAQ)

My amp stays in "Protection" (Flashing Red) even with the speakers unplugged. Why is that?

Check your ground first. The HD750/1 is highly sensitive to voltage drops. Use a multi-meter to ensure you have 12.6V+ at the amp terminals. A loose or painted ground point is the #1 cause of false protection codes.

Why does the "Status" light turn Amber/Yellow while I'm playing music?

This indicates "Thermal Protection" or "Clipping Prevention." The amp is getting too hot or the input signal is too high. Ensure there is 2-3 inches of clearance around the heat sink for airflow and back off the gain.

I have a 2-ohm sub, but the amp says "750W at 1.5-4 ohms." Is it safe?

Yes. Thanks to R.I.P.S. technology, this amp adjusts its internal rail voltage to provide exactly 750W regardless of whether your load is 1.5, 2, or 4 ohms. You don't need to change any manual switches for impedance.

How do I set the "Infrasonic Filter" for my ported subwoofer box?

Set the switch to "On" and the dial to roughly 5Hz below your box's tuning frequency (usually 25-30Hz). This prevents the woofer from over-excursion and "bottoming out" in the cabinet, which can destroy the voice coil.

My bass sounds weak even though the amp is on. What’s the fix?

Check the "Input Voltage" switch. if you are using RCA cables from an aftermarket radio, set it to "Low." If you are tapping into factory speaker wires, set it to "High." Setting this incorrectly will result in very low output.

Can I use 8-gauge power wire for this 750-watt amplifier?

No. JL Audio strictly recommends a 4-gauge 100% copper (OFC) power and ground wire. Using thin or CCA (Copper Clad Aluminum) wire will cause the amp to starve for current, leading to overheating and shut-offs.

Do I need a remote turn-on wire if I’m using the "Speaker Level" inputs?

Yes. Unlike some other JL models, the HD750/1 does not have "Signal Sensing" turn-on. You must connect the "Remote" terminal to a switched 12V source (like a cigarette lighter or the radio's remote output) to wake it up.

Why is my "Remote Dash Bass Knob" not changing the volume?

Ensure you are using the HD-RLC knob specifically. Other brands or even older JL knobs (like the RBC-1) use different internal resistance and will not work correctly with the HD series digital control port.

Specifications & Details

Key Features

Amplifier Key Features

Speaker Level Inputs

Power Specifications - Subwoofer Channel

RMS Power @ 4 ohms

750 watts x 1 channel

RMS Power @ 3 ohm

750 watts x 1 channel

RMS Power @ 2 ohms

750 watts x 1 channel

RMS Power @ 1.5 ohm

750 watts x 1 channel

Amplifier Specifications

Series

HD Series

Amplifier Class

Number of Channels

1 - Mono

Total RMS Power Output

750 watts

Maximum Input Gauge Size

4 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)
Full (AP)
Subsonic

High-Pass Crossover Frequency

50 - 500 Hz

Low-Pass Crossover Frequency

50 - 500 Hz

Subsonic Filter

0 - 30 Hz

Signal-to-Noise Ratio

111 dB

Remote bass/level controller

Optional (Accessory required and sold separately)

JL Audio HD-RLC

Fuse Rating

60A x 1

Total Fuse Rating

Strappable

Amp Bluetooth Connectivity

Hi-Res Certified

Low-Level Input Sensitivity

200mV - 2 volts

High-Level Input Sensitivity

800mV - 8 volts

What is in the box?

Paperwork

User manual
Warranty/Registration card

WITB: Amplifiers

Amplifier
Mounting screws (4)
Allen wrenches (2)

Warranty and Return Policy

Parts Warranty Duration

2 years

Labor Warranty Duration

2 years

Warranty Provider

Manufacturer

Customer Ratings & Reviews

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JL Audio HD750/1 (Open Box, Good)

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This item has been discontinued

Product Highlights

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HD750/1

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Welcome to the Team!

JL Audio HD750/1 (Open Box, Good)

We apologize

This item has been discontinued

Product Highlights

Description

HD750/1

Product Details:

Frequently Asked Questions (FAQ)

Specifications & Details

Item Details

Product and How-to Videos

Customer Ratings & Reviews

Customer Reviews

Related Searches

Are you sure you want to clear your garage?

This page was not designed for products.

Didn't find your car?

Account

Shopping help

Company

Everyday heroes

Brand stores

Useful links