JL Audio HD900/5 HD Series 5 Channel Class D Full Range Amp Amplifier 900w RMS
Couldn't Load Pickup availability
The JL Audio HD900/5 is a 5-channel, Class D system amplifier from JL Audio's HD Series, delivering 100W RMS x 4 on the main channels and 500W RMS on the subwoofer channel — 900W RMS total. It is designed as a compact, one-box solution for powering a full front, rear and subwoofer system.
The optional HD-RLC remote level control adjusts the subwoofer channel from the driver's seat.
Key specifications
- Channels: 5, Class D system amplifier
- Main channels: 100W RMS x 4 @ 4 ohm, 75W RMS x 4 @ 1.5–3 ohm
- Main channels bridged: 200W RMS x 2 @ 8 ohm, 150W RMS x 2 @ 3–6 ohm
- Subwoofer channel: 500W RMS x 1 @ 1.5–4 ohm
- Frequency response: 12 Hz–28 kHz (main), 12 Hz–10 kHz (sub)
- Subwoofer filter: low-pass 12/24 dB/octave, 50–500 Hz, 30 Hz infrasonic
- Input modes: 2, 4 or 6 channel
- Fuse: 60A, accepts up to 4 AWG wire
- Dimensions: 273 mm W x 211 mm D x 49 mm H
- Weight: 3.11 kg
One-box solution for complete system installations
The HD900/5 is ideal for installations where space is at a premium. It drives four satellite speaker channels and a subwoofer channel from a single compact amplifier, making it well suited to full high-performance car audio builds.
Single Cycle Control and R.I.P.S. technology
JL Audio's Single Cycle Control switching design and R.I.P.S. (Regulated Ideal Power Supply) technology allow the HD900/5 to deliver consistent high power across a wide range of load impedances. Tight power supply regulation keeps distortion low and sound quality high.
Build and finish
The HD900/5 features a brushed aluminium finish with black powder-coated cast alloy heat sinks and bottom panel. A black powder-coated, gasketed cover is included to protect the controls.
Explore the full range in JL Audio HD Amplifiers.
Specification
| Frequency Response | (Main Channels) 12 Hz - 28 kHz (+0, -1dB) |
|---|---|
| Frequency Response | (Subwoofer Channel) 12 Hz - 10 kHz (+0, -1dB) |
| Filter Mode(s) | Channels 1 & 2 (front) High-Pass only |
| Filter Slope(s) | Channels 1 & 2 (front) 12/24 dB/octave |
| Filter Frequency Range | Channels 1 & 2 (front) 50 Hz - 500 Hz |
| Filter Mode(s) | Channels 3 & 4 (rear) High-Pass only |
| Filter Slope(s) | Channels 3 & 4 (rear) 12/24 dB/octave |
| Filter Frequency Range | Channels 3 & 4 50 Hz - 500 Hz |
| Filter Mode(s) | Subwoofer Channel Low-Pass only |
| Filter Slope(s) | Subwoofer Channel 12/24 dB/octave |
| Filter Frequency Range | Subwoofer Channel 50 Hz - 500 Hz |
| Infrasonic Filter | Subwoofer Channel 30 Hz, Defeatable |
More specs
| |
What's Included
- 5-Channel class-D full-range amplifier
- Power/Ground/Turn-On plug
- 3 Speaker connection plugs
- 3mm Allen-wrench
- 5mm Allen-wrench
- Mounting bolts
- Owner's Manual
JL Audio
About the JL Audio HD900/5
From our tech experts at CEN
A 5-channel amplifier from JL Audio’s HD Series, rated at 900w RMS.
Who it suits
Drivers whose speakers have outgrown the head unit, or who are building a front stage where each channel has a defined job. HD Series packs high power into a chassis small enough to hide, which is why it ends up in so many tidy installs.
Our tech experts advise
Matching the amplifier to the speakers matters more than headline watts, and the gains want setting with a meter rather than by ear. It also needs a fused feed from the battery on the correct cable gauge. Installation is priced per vehicle, so get in touch with your make, model and year and we will confirm what it needs. See car audio installation.
Explore the full JL Audio range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all JL Audio
Recommended For You
Discover more top-rated gear, handpicked to go with what you're viewing
Have it Fitted By Our Team
Our team fits car audio, stereos, dash cams and vehicle security at our workshop in Beeston, Nottingham. Tell us your vehicle and we'll confirm the parts and a fitted price.
- 1
Tell us your vehicle
Make, model and year, and what you'd like fitted.
- 2
We confirm the parts
Fascia, wiring and interfaces checked for your car, with a fitted price.
- 3
Fitted at our workshop
Bring it to our Beeston workshop and we do the rest.
Unit 25 Technology Drive, Beeston, Nottingham NG9 1LA
More from JL Audio
More options from the same range, in stock and ready to go
Best SellerJL Audio 10TW3-D4 10 Inch TW3 Series Shallow Mount Subwoofer Dual 4 ohm 400w RMS
£409.00
View product
Best SellerJL Audio C1-650 C1 Series 6.5" 16.5cm Component Car Door Speakers 50w RMS Pair
£129.00
JL Audio C7-100CT C7 Series 1" 25mm Aluminium Dome Component Tweeter 100w RMS
£239.00
JL Audio JD400/4 JD Series 4 Channel Amp Full Range Class D Amplifier 400w RMS
£279.00
JL Audio C1-075CT 0.75" 19mm Car Component Tweeters & Crossovers 50w RMS Pair
RRP £54.90Save 8%£49.99
Frequently Asked Questions
Q: How do I choose the right amplifier for my speakers or subwoofer?
A: Match the amplifier's RMS output per channel to the RMS handling of your speakers or subwoofer at the same impedance. The Specification tab lists the power figures. If in doubt, contact CEN with your setup and we will recommend a match.
Q: What wiring do I need to install this amplifier?
A: You will need an amplifier wiring kit sized to the amplifier's power draw, typically including power and earth cable, a fuse, RCA leads and a remote wire. CEN stocks complete wiring kits, and the amplifier's fuse rating is the guide to the cable gauge required.
Q: What class of amplifier is this and does it matter?
A: Class D amplifiers are compact and efficient, ideal for subwoofers and modern installs. Class AB designs are traditionally favoured for outright sound quality on mid and high frequencies. The class is listed in the Specification tab where provided.
Q: Will an amplifier work with my factory head unit?
A: Yes, in most cases. If your head unit has no RCA outputs you will need a line output converter to feed the amplifier a clean signal. CEN stocks line output converters and can advise the right one for your vehicle.
Q: Can CEN install this amplifier?
A: Yes. CEN offers professional amplifier installation from our Nottingham premises, including secure mounting, wiring and setup. Contact us to book.
Q: Can the JL Audio HD900/5 run a whole car audio system?
A: Yes. It is designed to drive four satellite speaker systems from its main channels and a subwoofer system from its 500W subwoofer channel.
Q: Does the HD900/5 have preamp outputs?
A: No. The specification lists no pass-through preamp output, as it is designed as a one-box amplifier for the whole system.
Q: Is there a remote level control for the HD900/5?
A: Yes, the optional HD-RLC, which controls the subwoofer channel only.
Not Sure Where to Start?
Straightforward advice and the latest news from our Nottingham team.
All Guides and News →
Car Audio
Pioneer Perfect Fit 9-Inch Stereos: Fitting Kits and Every Car They Fit (2026)
Read the guide →
Car Audio
BMW Speaker Upgrades Explained: Where to Start and What Fits
Read the guide →
Car Audio
Christmas Gift Guide 2026: Car Audio, Dash Cams and Outdoor Tech
Read the guide →
Car Audio
Upgrading Car Audio Without Replacing the Factory Stereo
Read the guide →
Car Audio
Amplifier Wiring Kits Explained: Gauge, Fuses and Earths
Read the guide →
Car Audio
New at CEN: Option Audio Drive-10Flat — Golf Mk8 Bass, Zero Boot Space Lost
Read more →