JL Audio VX400/4i - 4-Channel Class D Full-Range Amplifier with Integrated DSP, 100 W x 4 @ 2 Ω / 75 W x 4 @ 4 Ω - 14.4V
Designed to simplify great audio, every VXi amplifier combines our advanced NexD2™ switching amplifier technology with an integrated, full-featured digital signal processor.
With our second-generation NexD2™ technology, the VX400/4i full-range amplifier outputs up to 75 watts per channel into 4 ohms, or 100 watts into 2 ohms. It can also be bridged into 4 ohms, producing up to 200 W x 2.
The NexD2™ full-range technology in this amplifier is DSP-controlled and features a reduced loop area design utilizing DirectFET™ outputs for outstanding fidelity, very low noise and exceptional efficiency. The amplifier chassis is ultra-compact, with all connections on one side, to greatly simplify installation into tight spaces.
Instead of traditional control knobs and switches, all amplifier adjustments and DSP functionality are configured via a compatible external device (PC, Tablet or Smartphone), with the appropriate JL Audio TüN™ Software application installed.
Amplifier includes: Power Connector (for 4 AWG wire), Analog Input/Pre-Out Harness, Speaker Output Harness, 6 ft A/B USB Cable
TüN™ Software Applications
Intuitive setup and tuning, all at your fingertips. Automatically recognizes connected amplifier and displays appropriate interface. TüN™ is available for download for free in a variety of applications, for computers and most handheld devices.
Unprecedented, Onboard DSP Tuning Power
- Premium, triple-core AKM® DSP with an optimized configuration, developed in collaboration with AKM®
- Hi-Res audio processing at 24 bit/96 kHz
- High-performance AKM® A/D and D/A converters
- 10 Bands of fully parametric EQ, per output channel, including pre-outs
- Shelving EQ option for Band 1 and Band 10
- High-Pass & Low-Pass Filters for each output channel, with selectable alignments and slopes:
Linkwitz-Riley: 12, 24, 48 dB/octave
Butterworth: 6, 12, 18, 24, 36, 48 dB/octave
- Signal Delay in 0.01 millisecond steps (equivalent to 1/8-inch, 3 mm)
- All-Pass Filter (Phase EQ), with variable "Q" and corner frequency
- Polarity Reversal (0 or 180 deg.)
- Output Level Trim in 0.1 dB steps
NexD2™ Switching Amplifier Technology
- Our latest generation of high-speed switching technology delivers superb low frequency power and efficiency.
- Specially optimized for subwoofer applications
Ultra-Versatile Analog and Digital Inputs
- High-performance, differential-balanced analog inputs for outstanding noise rejection
- Accepts speaker level signals from 200 mV, up to 16V RMS, including those from many factory systems
- Optical Digital (Toslink) input permits direct connection of S/PDIF digital sources, bypassing A/D converter. Accepts up to 24 bit/192 kHz input.
- Independently configurable RCA analog and digital pre-outs (24 bit/96 kHz)
- Automatic turn-on options via Signal-Sensing or DC-Offset sensing
Functional Compact Chassis Design
- Solid cast alloy main unibody and bottom plate deliver superb EMI performance and shielding
- All connections utilize compact mating connectors for maximum integrity and fitment into tight spaces.
- Configurable LED logo ring displays status and can display audio preset color code or user-defined color
- Logo badge can be oriented in 90 degree increments
- Corner caps engineered to conceal mounting holes and hardware
JLid™ System Command and Control with Networking Capabilities
JL Audio's digital protocol provides control interface and communication between VXi amplifiers and optional JLid™ accessories, including:
- DRC-100/DRC-200/DRC-205 Digital Remote Controllers: Offers convenient level and DSP preset control from the driver's seat.
- VXi-BTC Bluetooth® Communicator: Permits wireless configuration of VXi amplifiers using your compatible Apple® or Android® device.
- VXi-HUB Optical Network Hub: Provides network connectivity for up to five slave VXi amplifiers, allowing synchronization of DRC controllers and DSP presets. Up to two VXi-HUBs can be daisy-chained to network up to ten VXi amplifiers.
|@ 4 Ω||75 W RMS x 4|
|@ 2 Ω||100 W RMS x 4|
|Bridged @ 4Ω||200 W RMS x 2|
|@ 4 Ω||60 W RMS x 4|
|@ 2 Ω||90 W RMS x 4|
|Bridged @ 4Ω||180 W RMS x 2|
|Frequency Response||12 Hz - 24 kHz (+0, -1dB)|
|S/N Ratio, referred to highest rated power
|99 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)|
|S/N Ratio, referred to 1 W
|80 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)|
|S/N Ratio, referred to highest rated power
|101 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)|
|S/N Ratio, referred to 1 W
|81 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)|
|Damping Factor @ 4 Ω||>100 / 50 Hz|
|Damping Factor @ 2 Ω||>50 / 50 Hz|
|THD+N @ Rated Power||<1% @ 2 Ω per Ch.|
|Input Voltage Range @ RCA Inputs||200 mV - 16 V RMS|
|Min.Copper Power / Ground Wire Gauge||4 AWG wire|
|Fuse Rating||40 A (AFS, AGU or MaxiFuse™)|
|Height (H)||2.12 in / 54 mm|
|Width (W)||9.02 in / 229 mm|
|Depth (D)||6.62 in / 168 mm|
|Net Weight||5.0 lb / 2.27 kg|
NexD2™ Switching Technology
JL Audio's NexD2™ amplifier technologies are a next-level approach to improving what is already an outstanding Class D design platform. Employing new components and more advanced circuit layouts, fidelity and efficiency have been significantly enhanced.
NexD2™ switching technologies are an evolution of our renowned NexD™ Class D technology, with significant improvements in fidelity, efficiency and radiated noise performance.
NexD2™ employs a new generation of power supply and output devices, which are incredibly compact and surface-mountable. These Infineon® DirectFETTM devices feature the latest MOSFET silicon technology, the smaller package reduces parasitic capacitance and inductance thus improving current carrying capability and efficiency, encased in a metal enclosure to optimize heat dissipation. They also minimize radiated noise.
In addition to the new silicon, NexD2™ benefits from advancements in the area of circuit layout. Our "minimum loop area" design approach places capacitors closely coupled to each output section, and the amplifier circuits have been engineered to minimize the length of ground return paths. This approach reduces interaction between the audio channels, to improve separation and reduce distortion and radiated noise.
In the multi-channel VXi amplifiers, we have also leveraged the power of the on-board DSP to synchronize all channels via the DSP's master clock. This eliminates undesirable interactions between channels that are caused by variations in switching frequency.
The resulting NexD2™ amplifiers are incredibly compact and efficient, while delivering a level of fidelity that will satisfy the most demanding listener.
Advanced Rollback Protection
JL Audio's exclusive Advanced Rollback Protection circuit monitors the amplifier's thermal condition and adjusts amplifier operation to eliminate annoying amplifier shut-down events.
Should a JL Audio amplifier equipped with Advanced Rollback Protection reach an unsafe operating temperature, a special circuit rolls back peak power output, without changing gain, until the amplifier cools down to a safe operating temperature. The condition is generally indicated by a red “Thermal” or “Status” LED state. On VXI amplifiers, the LED ring will flash red. Once the amplifier cools down, the circuit restores full peak power output and the indicator reverts to its normal state. The operation of Advanced Rollback Protection is inaudible in most cases, but it ensures that your music keeps on playing, even under the most demanding conditions.
JL Audio’s Differential-Balanced Inputs are engineered to combat induced cable noise, which is a common problem in car and marine audio installations. This technology allows for the use of conventional RCA cables, while delivering many of the benefits of a true balanced connection and accepting a wide range of input signal levels.
Today’s vehicles are equipped with sophisticated electronics capable of generating noise and interference that can intrude into the audio path, ruining the listening experience.
Most audio equipment uses single-ended, ground-referenced RCA jacks to receive audio signals. This means that the RCA shield is connected directly to signal ground. This is a simple, cost effective input design that works well for short runs in noise free environments. In noisier environments, this method cannot reject the common mode noise that could be on both RCA conductors (shield and center conductor).
By having more than one chassis-grounded RCA shield on a device, single-ended input designs are also more susceptible to ground loops. If noise is present on both conductors while the shield is connected to ground, the input amplifier will amplify the noise relative to the grounded RCA shield. When there are multiple RCA connections or any other conductors subjected to a magnetic field, this will cause a difference in potential across the RCA loop to be amplified at the grounded RCA as noise (a classic ground loop).
JL Audio’s Differential-Balanced Input circuits measure the center pin of the RCA connection relative to the RCA shield, even when the shield is not connected to ground, and even when the voltages at both conductors are moving relative to ground. Because both the center conductor and the shield see high impedance to ground at the input, a ground loop cannot be formed, as there is no current flow to induce a voltage as noise. This works equally well with differential-balanced, or unbalanced signal sources, making this input architecture compatible with all standard car and marine audio equipment, using standard, unshielded, twisted-pair RCA cables. No special cables are required, unlike the fully balanced connections used in professional audio.
Another benefit of the Differential-Balanced Input design is that it easily accepts low-level and high-level signals from a variety of factory head unit outputs and amplifiers, including single ended “ground referenced” sources, as well as Balanced or Unbalanced “Bridged or BTL” sources. This eliminates the need for Line Output Converters (LOCs) in most installation scenarios.
The obvious question is: “Why don’t all car audio amplifiers use Differential-Balanced Inputs?” The answer is simple: it costs more. Executing a proper differential-balanced input section requires more components and better quality components than a basic single-ended design, so you generally won’t find them on less expensive amplifiers.
JLid™ is JL Audio's protocol for digital controllers and for communication of settings between devices (not for audio signals).
JLid™ offers two-way communication for a range of accessories, including the following:
Wired System Controllers: DRC-100, DRC-200, DRC-205
Bluetooth® Communicator: VXi-BTC
Networking Accessory: VXi-HUB
JL Audio FiX™ and TwK™ processors each feature one “JLid™ Port”, designed for connection of a wired controller.
JL Audio VXi amplifiers offer powerful networking capabilities via JLid™, to deliver single-point control of multiple amplifiers in a system. This allows the user to adjust levels (Volume, Fader, Balance, Zone Level) and to select from multiple DSP presets, across an entire group of networked amplifiers. JL Audio VXi amplifiers each feature separate “JLid™ Control” and “JLid™ Comm” ports. Please refer to the VXi product manual and our Help Center for details.
JLid™ connections are made via standard CAT-5e cables.
U.S.A. Warranty Information - Mobile Audio Amplifiers and Electronic Products
JL Audio Amplifiers and Electronics are warrantied against defects in materials and workmanship for Two (2) Years from purchase date. The Mobile Audio Amplifier warranty can be expanded to a total of Three (3) Years from the date of purchase with the accompanying purchase of a qualifying JL Audio Amplifier Power Connection System and with installation by a JL Audio Authorized Retailer. JL Audio will, at its discretion, repair or replace any products that exhibit defects in materials and/or workmanship during the warranty period.
Please hold on to your sales receipt! All warranty service requires original sales receipt documentation. The warranty only applies to the original purchaser from an authorized retailer.
Note: Products purchased from unauthorized dealers are not covered under warranty.
The following is not covered under JL Audio's warranty program:
1. Product with defaced, altered or removed serial numbers (no valid, legible serial number = no warranty).
2. Product owned by anyone other than the original purchaser from an authorized JL Audio dealer. (The warranty is not transferable and will not apply to products purchased from unauthorized dealers.)
3. Product that has been physically abused (run over by a car or beat with a hammer, for example).
4. Product that has not been installed according to the instructions in the owner's manual
5. Product in which repair and/or modification has been attempted by unauthorized parties
6. Product damaged cosmetically due to improper handling or normal wear and tear
7. Product damaged in an accident, due to criminal activity (attempted theft, gunshot damage, etc.) or by 'acts of God' (flooding, lightning, locusts, etc.)
8. Custom finishes or other cosmetic treatments applied to products. (JL Audio will not be responsible for restoring or maintaining any custom finishes)
9. Installation and shipping costs associated with removing, re-installing or shipping the product to JL Audio for warranty service
Ask your dealer for details on warranty limitations.
If you need Service on your JL Audio Product:
All warranty returns should be sent to JL AUDIO freight prepaid through an authorized JL AUDIO dealer and must be accompanied by proof of purchase (a copy of the original sales receipt.) Direct returns from consumers or non-authorized dealers will be refused unless specifically authorized by JL AUDIO with a valid return authorization number. Warranty expiration on products returned without proof of purchase will be determined from the manufacturing date code. Coverage may be invalidated as this date is previous to purchase date. Return only defective components. Non-defective items received will be returned freight-collect. Customer is responsible for shipping charges and insurance in sending the product to JL AUDIO. Freight damage on returns is not covered under warranty. Always include proof of purchase (sales receipt).
U.S. 48 Only
For all items eligible for shipping:
FREE: 1-5 Business Days UPS
Expedited Shipping Options: Calculated At Checkout
Large Item Shipping Costs: Calculated At Checkout
Our policy lasts 30 days. If 30 days or less have gone by since your purchase, we are happy to issue a refund or exchange.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.
To complete your return, we require a receipt or proof of purchase.
Please do not send your purchase back to the manufacturer.
There are certain situations where only partial refunds are granted (if applicable):
Any item not in its original condition, is damaged or missing parts for reasons not due to our error
Any item that is returned more than 30 days after delivery
Refunds (if applicable):
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.
Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at firstname.lastname@example.org.
Sale items (if applicable)
Only regular priced items may be refunded, unfortunately sale items cannot be refunded.
Exchanges (if applicable)
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at email@example.com and send your item to: 19010 Statesville Rd Cornelius North Carolina US 28031.
If the item was marked as a gift when purchased and shipped directly to you, you’ll receive a gift credit for the value of your return. Once the returned item is received, a gift certificate will be mailed to you.
If the item wasn’t marked as a gift when purchased, or the gift giver had the order shipped to themselves to give to you later, we will send a refund to the gift giver and he will find out about your return.
To return your product, you should mail your product to: 19010 Statesville Rd Cornelius North Carolina US 28031
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
To reach customer service please email firstname.lastname@example.org
Depending on where you live, the time it may take for your exchanged product to reach you, may vary.
If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.