: Monoblock Class D Subwoofer Amplifier, 300 W
Rated Continuous (RMS) Power @ 14.4 V
|@ 4 Ω||200 W RMS x 1|
|@ 3 Ω||250 W RMS x 1|
|@ 2 Ω||300 W RMS x 1|
|@ 1.5 Ω||N/A|
Rated Continuous (RMS) Power @ 12.5 V
|@ 4 Ω||160 W RMS x 1|
|@ 3 Ω||210 W RMS x 1|
|@ 2 Ω||270 W RMS x 1|
|@ 1.5 Ω||N/A|
|Frequency Response||10 Hz - 1 kHz (+0, -1dB)|
|S/N Ratio, referred to highest rated power||>100 dB below rated power (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)|
|Damping Factor @ 4 Ω||>120 / 50 Hz|
|Damping Factor @ 2 Ω||>60 / 50 Hz|
|THD+N @ Rated Power||<1% @ 2 Ω per Ch.|
|Input Voltage Range @ RCA Inputs||100 mV - 4 V RMS|
|Min Copper Power / Ground Wire Gauge||8 AWG wire|
|Fuse Rating||30 A (AFS, AGU or MaxiFuse™)|
|Filter Modes||Low-Pass only|
|Filter Slope (dB/Octave)||12 dB or 24 dB|
|Filter Frequency Range||50-500 Hz|
|Detented, Calibrated Filter Freq. Potentiometer||Yes|
|Bass Boost EQ||No|
|Output Polarity Switch||No|
|Remote Subwoofer Level Control||Optional (HD-RLC)|
|Remote Bass EQ Boost Control||No|
|Pass-Through Preamp Output||Buffered|
|Height (H)||2.05 in / 52 mm|
|Width (W)||6.85 in / 174 mm|
|Depth (D)||7.09 in / 180 mm|
|Net Weight||3.8 lb / 1.72 kg|
NexD™ Switching Technology
NexD™ amplifier technologies produce exceptional audio quality, unsurpassed total efficiency and high power from very compact amplifier designs.
Beginning with the original 'Slash' subwoofer amplifiers, JL Audio has been at the forefront of Class D amplifier design. Today, our flagship Single-Cycle Control™ technology sets the ultimate standard for Class D amplifier performance. The NexD™ amplifiers may be a bit less complex, more compact and more affordable, but they flow from the same minds that have set the trend in mobile amplifier technology for over a decade.
Let's get a little nerdy... A traditional PWM switching amp design uses a fixed switching frequency and varies the pulse width based solely on the audio input signal to the pulse modulator. This basic approach assumes some ideal conditions, like a rock-steady power supply, that do not necessarily occur in a real, in-car installation. Power supply sag with signal causes distortion at all power levels with these designs, even well below clipping. The cure for this is feedback (a corrective signal sent back to the input side), but this becomes impractical as the audio frequency increases, making it a good solution for band-limited (subwoofer) amps, but not for full-range amplifiers.
Taking the above into account when designing the NexD™ subwoofer amplifiers, we have taken the simple fixed PWM approach and enhanced it with a very high switching frequency: 240 kHz, which is about 4x higher than most Class D subwoofer amplifiers. This pushes the amplifier's bandwidth to at least 500 Hz with minimal distortion and improves efficiency, while keeping typically bulky circuity more compact. Your subwoofers will reward you with tight, rock-solid bass performance.
For the full-range NexD™ amplifiers and channels we applied a variable, ultra-high speed version of the NexD™ technology (switching at well over 400 kHz). In these designs, a self-oscillating modulator with "feed-forward" sends information about the instantaneous power supply voltage to the modulator, combining this with the input signal to cancel out any distortion due to supply voltage fluctuation. This reduces distortion prior to applying feedback, simplifying the overall feedback loop design.
The bottom line is simply great audio: clean, powerful and reliable.
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 red "Thermal" LED will light to indicate this condition has been reached. Once the amplifier cools down, the circuit restores full peak power output and the red "Thermal" 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.
Download Product Manual: XD300/1 Manual
UK 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).