About the JL Audio RD900/5
Power your entire system
Power your entire system
JL Audio's RD900/5 5-channel amplifier will send 75 watts RMS to each your car's front and rear speakers, while delivering up to 500 watts RMS to a sub. Or, for louder applications, you could switch your RD900/5 to 3-channel mode and run a pair of high performance speakers with 200 watts each and still send 500 watts to a sub. An optional wired remote lets you adjust the sub's volume from your front seat.
Low current demand, low distortion, and easy integration
The RD900/5 plays your music with true fidelity and impressive impact, without straining your car's electrical system, thanks to JL Audio's proprietary NexD™ amplifier technology. "Differential-balanced" inputs keep the incoming signals clear of outside noise, and allow you to connect this amp to just about any radio. The speaker-level inputs feature two auto turn-on modes so you can readily incorporate this amp into a factory system — no need for RCA connections or a remote turn-on lead for this setup.
LED clip lights and other cool features
High-pass filters, low-pass filters, and a bass boost help you dial in the perfect tone for your speakers and subwoofer. Onboard LED clip indicators let you set the amp gain quickly and accurately with the use of a test tone. A removable cover hides the amp's controls, resulting in a handsome appearance and a tamper-resistant installation. Cool blue LED accent lighting adds some charm to this amp's rugged good looks.
JL Audio RD900/5 controls and accent lighting
- 5-channel car amplifier
- 75 watts RMS x 4 + 225 watts RMS x 1 at 4 ohms
- 100 watts RMS x 4 + 500 watts RMS at 2 ohms
- 200 watts RMS x 2 bridged at 4 ohms (4-ohm stable in bridged mode) + 500 watts RMS at 2 ohms
- Class D amplifier design with NextD™ switching amp technology
- differential-balanced inputs help eliminate noise
- variable high-pass filters (50-500 Hz, 12 dB/octave) on front and rear channels
- variable low-pass filter (50-500 Hz, 12 dB/octave) on subwoofer channel
- LED clip lights help set gain
- blue LED accent lighting
- optional wired remote level control for subwoofer channel
- preamp and speaker-level inputs (speaker wire to RCA adapter required for speaker-level input)
- 4-gauge power and ground leads and 80-amp fuse recommended wiring and hardware not included with amplifier
- no onboard fuses when installing multiple amps in a system, an additional 80-amp in-line fuse between the distribution block and the amplifier is recommended
- 14-11/16"W x 2-3/16"H x 7"D
- warranty: 2 years
- Our 60-day money-back guarantee
- MFR # 98642
What's in the box:
- 5-Channel amplifier
- 2.5mm Allen wrench
- Self-adhesive JL Audio badge
- Owner's manual
JL Audio RD900/5 reviews
such a breeze to set up..... stock speakers in the back deck and new 6.5's in the front doors..jl sub out back...WONDERFUL...SOUND !!!!
0 of 0 found this helpful
0 of 0 found this helpful
Great replacement for my old XD 500/5. I can tell a big improvement. Plus, it's 2:3 the size.
0 of 0 found this helpful
Easy to install and tune. Super happy with it
0 of 0 found this helpful
Easy Install. Great sound. Tuning process is a breeze.
0 of 0 found this helpful
This amp is as advertised. Did NOT disappoint. It made my speakers come alive like promised. I can't tell you how happy I am to have this as the core of my system. Can't wait to add a sub and max it out!! Definitely would recommend this amp!!!
Pros: Clean sound, plenty of power, great looks.
0 of 0 found this helpful
Very nice amp it made my JL 6.5 speakers and sub sound awesome
1 of 1 found this helpful
Easy installation and sleek design. Versatile amp. I'm using this for 2 front speakers and the sub. With the clipping indicator gives me reassurance that I'm not exceeding its limits. Not 5 stars because I had to use a different Allen wrench than the provided one for a few screws.
2 of 11 found this helpful
This is running some Hertz Energy components and an Audiofrog 12" sub. My goal is sound quality rather than volume, but this can still play my system way louder than I want to listen to. I'm a big fan of the clip indicator lights and really like how easy the controls are to access from the face of the unit because it makes adjustments really easy. One of the issues with 5-channels is they often don't put out much power on the sub channel. One of the reasons this amp really appealed to me (other than being highly rated in listening reviews) is the 500 watts at 2 ohms. If you're looking for a 5-channel, def give this some consideration.
13 of 14 found this helpful
So far so good, I was hesitant at buying any other amp other than JL. In the past I've owned Slash, and XD series amps and was always happy with the sound quality. I have only recently heard of the RD series amps. I'm driving Hertz Audio Coax all around and a Pioneer prefab sub box (10") in my 2016 Nissan Murano. The amp runs CLEAN and COOL. Very quiet turn on and turn off, excellent installation location for all adjustments and input wires. Simple and clean look which makes the amp even more astonishing. It reminds me of German Engineering for some reason. Give it a test drive, definitely very happy with my purchase. I was going to get the 400/4 but am really glad I spent the extra money and got the sub outputs. Signal sensing didn't work all that well, only detected my turn on a couple of times. Spoke with JL and they obviously recommended hardwired Remote. So I did and it all worked fine after that.
Pros: Compact, clean sound, cool operation, ease of use
Cons: Signal sensing didn't work all that well. Wish they had included the sine wave CD for the clip sensing feature, you have to go download it from their website.
6 of 6 found this helpful
This amp delivers enough power for a complete 4 satellites + 1 subwoofer. I've got it hooked up with JL C3 525 front, JL C2 525 back and a 10W3-D4 JL sub in the trunk on my 2017 Fiat 500. I have to say, the sound is crisp and clean on mids and highs. The lower bass lines and beats sound good, but sometimes it feels like missing more bass. The size is perfect if you have little room like i did. The looks is very sober, clean and elegant overall. The clipping setup is awesome! works perfectly. Overall a very good amp!
Pros: Size and nr. of channels
Cons: The bass channel lacks bass power sometimes
5 of 6 found this helpful
After reading other reviews i must be the unlucky guy. In short the amp does everything it says it will do and i love the built in lights to help setup the amp properly to avoid clipping. My 2 star rating is completely based on the issue of engine noise that has proven impossible to resolve . I replaced my JL XD700 5v2 with this. So as you might guess it was pretty much plug and play. Same rca's, same power/ground wiring, NOT the same performance. I work at a Toyota Dealership and always have my gear professionally installed (work perks). they've gone through a number of different exercises to try to isolate and irradiate the engine noise to no avail. I'm so unhappy with this purchase. Its been explained to me by the Crutchfield tech support team that just because one amp worked fine with my existing setup doesn't mean another one will but i don't really understand how that doesn't point directly to a shortcoming of the new amp.
Pros: decent power decent price
Cons: quality of product??? see my review for more info
10 of 17 found this helpful
Absolutely love the amp. Upgraded all speakers with Rockford fosgate and added 12" sub. Wow!!! 2013 Jeep Wrangler unlimited with top off or on sounds incredible. Highly recommend.
4 of 4 found this helpful
A little bulky, but packs a powerful punch and sounds crisp and clean.
6 of 7 found this helpful
Ok I have had this amp hooked for about 2 days now and I am not disappointed! I do have a sound processor hooked up as well (kicker front row) but everything sounds loud and clear. The highs are crystal clear and the lows are not too bad either. It hits hard and does not use much power at all and does not get too hot. I would recommend this amp because it has more than enough power to run you entire system. 500 watts to the subs is more than enough me. So if you need more than that this might not be the amp for you.
Pros: Small, Powerful and sounds great.
Cons: Do not really like the cover plate because you have to remove it if you need to make adjustments to the amp.
10 of 10 found this helpful
Crystal clear on the mids and highs but the sub channel is a little underwhelming. I have it pushing two 10W1V3 4ohm subs and it pushes them ok, but not as well as the Rockford Prime 500/1 I was running on them with before.
Pros: Crystal clear mids and highs, super loud
Cons: I think the sub channel power is overrated
7 of 11 found this helpful
Nice clean sound at all levels!
2 of 3 found this helpful
This is an awesome sounding amplifier, compact and powerfull
Pros: Compact, powerful, ease of installation,
Cons: pricey but worth every penny
6 of 6 found this helpful
Was skeptical at JL's new amp lineup, but figured I'd roll the dice and see what happens. Ended up re-doing my amplifier setup in my Acura RSX. Went from a 4 channel & mono channel sub amps, down to a single 5 channel. My setup is JL XR 6.5" components, C2 6.5"s, 10W6V2, 4 gauge power wire and monster cable RCAs. The sizing of the amp is truly amazing of how things have progressed in the car audio world. This 5 channel is almost as big as the 4 channel that I replaced which was an audiophile, not a big name brand amp. First and foremost - the sound: Not sure if it was me, but this amp made my speakers come to life. Not only with power like my old setup, but clarity. If you are worried that this amp isn't going to good enough for your audiophile expectations - have no fear, this amp is great and at almost half the price of JL's more premium lineup. I would definitely recommend this amp to anyone, especially if you are on a tight budget. Don't let the RD series fool you, its't going to be tough to decipher between the XD/HD sound quality to the naked ear.
Pros: - budget price - big power output -small size - quality build
Cons: -Doesn't look as good as HD/XD series amp lineup - Coverplate screws tough to lineup
13 of 13 found this helpful
I put this 5 channel amp in a 2000 Toyota Tacoma ext cab. Also and new receiver, 2 front door speakers, 2 rear speakers, and 10" JL Audio Sub. This Amp made my system complete. After adjusting to the Amp to the perfect sound for me. Good highs and Mids and just the right amount of base. Everything sounds great even turned up to loud for my ears. I'm up in my 40s like listening to; ole and new country, classic rock, pop rock, even some new pop. I have sons between 18 and 22 yrs old and now they want a 5 channel amp instead of there Mono signal channel amp only pushing there subs. I have played with electronics for 30 yrs. and this is a sweet amp
18 of 18 found this helpful
More details on the JL Audio RD900/5
Features & specs
|RMS Power Output (Watts x Channels)||
75 x 4 |
225 x 1
|Peak Power Output (Watts x Channels)||N/A|
|Power at 2 Ohms (Watts x Channels)||100 x 4|
|Bridged Power (Watts x Channels)||200 x 2|
|Minimum Impedance Bridged||4|
|Minimum Impedance Unbridged||2|
|Best Frequency Response||12-22k Hz|
|THD at Rated RMS Power||1%|
|Signal to Noise Ratio||84 dB|
|Low-Pass Crossover Frequency||50-500 Hz|
|Low-Pass Slope (dB/octave)||12 dB/octave|
|High-Pass Crossover Frequency||50-500 Hz|
|High-Pass Slope (dB/octave)||12 dB/octave|
|Bass Boost Frequency||N/A|
|Speaker Level Inputs||RCA|
|Parts Warranty||2 Years|
|Labor Warranty||2 Years|
RD Series: The JL Audio RD series amplifiers feature big audio performance from a small footprint. With exclusive NexD switching technologies, the RD amps run cooler than most other amplifiers. Because the RD amps employ smaller cast alloy heat sinks, they can be installed in smaller spaces. RD amplifiers feature a black powder-coat finish with a brushed aluminum cover for the controls.
Full Range Class-D Amplifier: The RD900/5 is a Class-D full range amplifier, designed specifically for powering two pairs of speakers and a subwoofer. The amplifier is stable down to 2 ohms, and has the following power output:
|Input Power||4 ohms||3 ohms||2 ohms||4 ohms bridged|
|Main Channels||14.4 V||70 W x 4||---||100 W x 4||200 W x 2|
|12.5 V||60 W x 4||---||90 W x 4||180 W x 2|
|Subwoofer Channel||14.4 V||225 W x 1||325 W x 1||500 W x 1||---|
|12.5 V||200 W x 1||250 W x 1||350 W x 1||---|
Differential-Balanced Inputs: The RD900/5 features differential-balanced input architecture to effectively control noise and ensure compatibility with a wide variety of source units, including many OEM systems. Without resorting to line output converters, you can directly connect most OEM source units to the amplifier without creating any noise or compatibility issues. Unlike conventional single-ended inputs, the differential-balanced design does not connect one side of the audio signal to chassis ground. This eliminates any voltage sensitivity between one input terminal and ground and greatly reduces the incidence of alternator whine in a typical car audio installation.
Note: You will need a Speaker Wire to RCA adapter (sold separately) to connect this amplifier to your head unit via speaker level.
Protection Circuitry With Status Indicator Lights: The amp features a bi-color LED light strip on the top panel of the amplifier to indicate the amplifier's operating status:
- Temporary Red: When the amplifier is powering up, the light strip turns red for 3 seconds and audio output is muted.
- Constant Blue: The LEDs light blue to indicate that the amplifier is turned on and operating normally.
- Constant Red: The LEDs light constant red to indicate that the amplifier has exceeded its safe operating temperature, putting the amplifier into a self-protection mode, which mutes the power output of the amplifier. The red LEDs will shut off and the amplifier will return to normal, full-power operating mode when the temperature drops back to a safe level.
- Momentary Red: The light strip will light red for 1/2 second and the output will be muted to indicate that an over-current condition has occurred. Over-current condition can be caused by a speaker impedance lower than the optimum load impedance range for the amplifier or a short-circuit in the speaker wiring.
- LEDs Off: The only condition that will shut down an undamaged RD900/5 completely is if battery voltage or remote turn-on voltage drops below 10 Volts. The amplifier will turn back on when voltage climbs back above 11 Volts.
Cooling System: The outer shell of the JL Audio amplifier is designed to remove heat from the amplifier circuitry. For optimum cooling performance, this outer shell should be exposed to as large a volume of air as possible. Enclosing the amplifier in a small, poorly ventilated chamber can lead to excessive heat build-up and degraded performance.
Control Panel Cover: The RD900/5 features a brushed aluminum Control Panel Security Cover which protects and hides the amplifier's controls. When installed, the cover ensures that the amplifier's settings are not accidentally changed while creating a clean aesthetic look for the amplifier and your installation. The control panel security cover is pre-installed at the factory and must be temporarily removed to access the amplifier's controls. The security cover screws can be removed with the supplied 2.5mm Allen wrench.
LED Clipping Indicators: The amplifier is equipped with an onboard LED clipping indicator which let you quickly and accurately set the amp's input sensitivity without special equipment. The simple, 7-step procedure using a Test CD and a screwdriver properly sets the input sensitivity to its optimum level.
Flexible Input Section and Active Crossover Network: The RD900/5 amplifier provides a flexible input section and a comprehensive crossover network to fine tune your system effectively and accurately. The amp is equipped with 12 dB/octave Butterworth crossovers: high-pass filters for the front and rear channels, and a low-pass filter for the subwoofer channel. The crossovers each feature a rotary control to select the cutoff frequency between 50Hz and 500Hz. There are additional markings at 60Hz, 80Hz, 120Hz, and 200Hz. You'll need a small screwdriver (not included) to set the frequency.
Turn-on Options: The Turn-on Mode Switch lets you choose the method for turning the amplifier on and off:
- +12V Remote Turn-on Lead: The preferred method for turning the amplifier on and off is by running a turn-on lead from the source unit and connecting it to the Remote terminal. When +12V is present at the terminal, the amplifier will turn on. When the +12V is turned off, the amplifier will shut off. The set screw connector on the Remote terminal will accept 18 AWG to 12 AWG wire.
- DC Offset-Sensing: The amplifier will turn on and off when the presence of a very small DC signal (or offset) is detected on the amp's RCA left channel input. The amplifier will turn off when this DC Offset is no longer present. This method is designed for high-level (speaker-level) input signals, not for low-level (line-level) signals.
- Signal-Sensing: The amplifier will turn on and off by detecting the presence of a full-range audio signal at the left-channel input. The amp will turn off approximately 30 seconds after the audio signal is no longer detected. This method is designed for use with high-level (speaker-level) input signals and not for low-level (preamp level) signals.
Note: When the DC Offset or Signal Sensing turn-on methods are being used, the amp's Remote terminal can be used as a remote turn-on output for other amplifiers or accessories in the system.
Input Voltage: The amp will accept a wide range of signal input voltages, from 200mV to 8V. The range is split into two sub-ranges: "Low" for preamp level signals from 200mV to 2V, and "High" for high-output preamp level signals and speaker level signals from 800mV to 8V.
Input Mode: The Input Mode switch lets you set the amplifier for the number of channels of input being fed into the amplifier. You can send six discrete channels, or use only four or two channels to feed all of the amplifier channels. The Input Mode switch can be set to 6 CH, 4 CH, or 2 CH.
Power/Ground/Turn-On Terminals: This JL Audio RD amplifier features set screw clamp terminals for the power, ground, and remote turn-on connections. A 2.5mm hex-wrench is supplied for tightening or loosening the set screws.
- Power and Ground: The amplifier's set screw clamp Power and Ground connections are designed to accept up to 4 AWG power wire, as recommended by the manufacturer.
- Remote Turn-On: The amplifier's set screw clamp turn-on lead will accept 18 to 12 AWG wire.
Note: The Amplifier is not equipped with a fuse. An external 80-amp AFS, AGU, or MAXI fuse must be installed on the power wire. If a wiring kit is used which includes a fuse with a value other than 80 amps, the original should be replaced with a 80-amp fuse.
Speaker Output Terminals: The JL Audio RD900/5 features eight set screw clamp speaker terminals for the front and rear channels, and four for the subwoofer channel. The terminals for the subwoofer channel allow you to connect up to two subs, and are internally wired in parallel. (They are not stereo outputs.) The terminals will accept 16 to 8 AWG speaker wire.
Preamp Inputs: The amplifier features three sets of differential-balanced RCA jack inputs, each with an Input Voltage switch and rotary Input Sensitivity control. The amplifier's input voltage range is 200mV-2V (LOW) and 800mV-8V (HIGH).
Remote Level Control: The amplifier features a standard RJ-14 telephone connector for adding the optional RBC-1 Wired Remote Bass Controller (sold separately). The Remote Bass Controller lets you control the volume of the subwoofer from the driver's seat.
- Frequency Response:
- Main Channels: 12 Hz to 22 kHz (+0, -1dB)
- Subwoofer Channel: 10 Hz to 500 Hz (+0, -1dB)
- Signal-to-Noise Ratio: >104dB at highest rated power, >84dB at 1 W
- Damping Factor: >150 / 50 Hz @ 4Ω, >75 / 50 Hz @ 2Ω
- THD+N: <1% at 2Ω per channel (rated power, main and subwoofer channels)
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