JL Audio JD250/1 + JL 10W0V3-4 Subwoofer + 8 Gauge Amp kit

Product Overview

     Designed to produce a healthy 250 watts into 2 ohms (14.4V, 1% THD), the JD250/1 amplifier is a great solution for powering subwoofers in a cost-conscious system. Our proprietary NexD™ switching technology delivers large amounts of real-world power output with excellent efficiency and ultra-low distortion.

     The JD250/1’s controls are located on the input panel. while the power and speaker connections can be found along the opposite end of its extruded aluminum chassis. Signal processing features include a 12 dB / octave low-pass filter, with continuously variable frequency selection from 50-500 Hz, and a variable bass boost EQ. Dual-range, differential-balanced inputs are also on-hand, capable of accepting line-level and speaker-level signals. Automatic turn-on capability (via signal sensing or DC-offset sensing) is standard, along with a set of preamp outputs so you can easily pass signals to another amplifier.

     The JD250/1 is also equipped with an onboard LED-clipping indicator ring, surrounding the input sensitivity control. This useful feature lets you easily set your amplifier’s input sensitivity, quickly and accurately, without special equipment. With the addition of an RBC-1 remote level control (sold separately), you can control the subwoofer level from the driver’s seat.

NexD Switching Technology

    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.

Differential-Balanced Inputs

     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 the 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.

General Features:

• Frequency Response: 7 Hz - 500 Hz (+0, -1dB)
• S/N Ratio, referred to highest rated power: >80 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth)
• S/N Ratio, referred to 1 W: >60 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)
• Damping Factor @ 4 Ω: >1000 / 50 Hz
• Damping Factor @ 2 Ω: >500 / 50 Hz
• THD+N @ Rated Power: <1% @ 2 Ω per Ch.
• Input Voltage Range @ RCA Inputs: Switchable from 200 mV - 2 V RMS (Low) to 800 mV - 8 V RMS (High)
• Min.Copper Power / Ground Wire Gauge: 8 AWG wire
• Fuse Rating: 30 A (AFS, AGU or MaxiFuse™)
• 8 gauge power and ground wiring is recommended for installation. Contact us for information regarding a discount on select amplifier kits from our website when purchased together with this amplifier. Click Here for our contact information.
• Dimensions: 9.5"W x 7.5"D x 2.1"H
• Authorized Internet Dealer
• 1 Year Manufacturer's Warranty

Power Rating @ 14.4V

• 4 Ohm: 150 Watts RMS x 1
• 3 Ohm: 200 Watts RMS x 1
• 2 Ohm: 250 Watts RMS x 1

Power Rating @ 12.5V

• 4 Ohm: 115 Watts RMS x 1
• 3 Ohm: 150 Watts RMS x 1
• 2 Ohm: 200 Watts RMS x 1



Signal Processing

• Filter Mode(s): Low-Pass only
• Filter Slope(s): 12 dB/octave
• Filter Frequency Range: 50 Hz - 500 Hz
• Filter Defeat Function: No
• Bass Boost EQ: Yes
• Output Polarity Switch: No
• Remote Subwoofer Level Control: Optional (RBC-1)
• Pass-Through Preamp Output: Buffered

Product Details:

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• 10" W0v3 Series Subwoofer Driver
• Power Handling:
• RMS: 300 watts
• Recommended Power Range: 75 - 300 watts
• Impedance: Single 4-Ohm
• Mineral-filled, polypropylene cone woofer for excellent durability
• Large roll surround for generous amounts of excursion
• Elevated frame cooling brings air directly to the voice coil
• Designed for compact sealed enclosures or medium-sized ported enclosures
• Large excursion for louder bass and less distortion
• DMA Optimized motor system reduces distortion and tight, clean bass
• Lead wire woven into spider for added strength
• Metallic silver frame finish
• 2.0" High temperature voice coil

Enclosure Specifications

• Sealed Enclosure: 0.65 cu. ft.
• Ported Enclosure: 1.125 cu. ft.
• Mounting depth: 4.90 "
• Cutout dimensions: 9.0625 "
• Free Air Resonance (Fs): 32.09 Hz
• Sensitivity: 84.07 dB
• Xmax: 11.4 mm
• Reference Efficiency (no): 0.1500%
• Frequency response: ~26 ~ 250 Hz
• Black Steel-Mesh Grille Insert Available: JL Audio SGRU-10
• Matching Amplifier:
• JL Audio XD300/1v2
• JL Audio JX500/1D
• Authorized Internet Dealer
• 1-year Manufacturer's Warranty

JL Model Comparison From entry level woofers to competition grade, JL has them all. Let us find which one works for you.
Model	RMS Power	Cone Material	Surround Material	Sensitivity (dB)	Frequency Response	Xmax (mm	Terminals	Made In America
W7 Series	500-1500 Watts	Polypropylene	Foam Overroll	82.7 - 86.3	15-250 Hz	19-32	Push Terminals
W6 Series	600 Watts	Polypropylene	Rubber	82.7 - 85.4	20-200 Hz	19	Push Terminals
W3 Series	150-600 Watts	Polypropylene	Rubber	80.5-87.90	20-250 Hz	8.89-15.5	Push Terminals
W1 Series	150-300 Watts	Polypropylene	Rubber	83.9-86.1	22-200	8-11	Push Terminals
W0 Series	300-500 Watts	Polypropylene	Foam	84-88.20	20-250 Hz	11.4-12.7	Push Terminals
WX Series	200 Watts	Polypropylene	Foam	86-87.17	22-250 Hz	10	Spade Terminals

Product Details:

• Complete 8 Gauge 2-Channel Amplifier Installation Kit
• Designed for car audio systems up to 600 watts RMS
• Premium Powerflex power and ground wire provides optimal power transfer
• Belva CCA wire is made from 30% copper while the competition uses only 10%
• Helical Twist Construction Audio Interconnect RCA cables minimize noise and interference
• MINI-ANL Fuse holder with a 60 amp fuse offers ideal protection for high powered systems
• Complies to American Wire Gauge standards
• Also available in Blue
• Authorized Internet Dealer
• 1-year Manufacturer's Warranty

Kit includes:

1. 17 ft. (5.2 meters) Red 8 gauge power wire
2. 3 ft. (.91 meters) Black 8 gauge ground wire
3. 17 ft. (5.2 meters) Gray 18 gauge remote lead wire
4. 17 ft. (5.2 meters) Helical Twist 2-channel RCA interconnect cable
5. 20 ft. (6.1 meters) 16 Gauge Speaker cable
6. One MINI-ANL Fuse Holder with a 60 amp fuse
7. One Black rubber firewall grommet
8. One 8 Gauge Red chrome plated ring terminals
9. One 8 Gauge Black chrome plated ring terminal
10. Three 18 Gauge Red Spade terminal
11. Two 18 Gauge Black Spade terminal
12. One 18 Gauge Red butt connector
13. Ten 4" Black zip ties