JL Audio XD600/1v2 Mono Channel Subwoofer Bass Amplifier

This potent monoblock amplifier employs our high-speed NexD™ switching design to achieve unprecedented efficiency and amazing power output in a very compact chassis. Don't let the small size fool you, though... this amplifier is capable of serious subwoofer power, delivering a full 600 W of continuous power into a 2 ohm load (14.4V, 1% THD).

Targeted specifically for subwoofer applications, the XD600/1v2 includes a variable slope low-pass filter with continuously variable cutoff frequency selection from 50-500 Hz.

The XD600/1v2 also features the v2 Spec feature set, which consists of automatic turn-on capability (via signal sensing or DC-offset sensing), and a dual-range differential-balanced input section able to handle a wide range of input voltage levels. With the addition of an HD-RLC remote level control (sold separately), the amplifier's level can be directly controlled from the driver's seat.

This amplifier features a black powder-coat finish and a gasketed, brushed aluminum cover for the controls.

Some might just see a small amplifier... But, for those who appreciate great audio, XD's reveal something huge.

• 600W RMS @ 2 ohm
• 400W RMS @ 4 ohms
• NexD Ultra-High Speed Class D
• Dimensions: 217 mm x 180 mm x 52 mm

Connections

• Inputs: Differential-balanced with RCA jack inputs
• Speaker output connections:     Accept up to 12 AWG wire
• +12V and Ground connections:     Accept up to 4 AWG wire
• Preamp Output: Buffered pass-through type

On-board Crossover

• State-variable
• 12 dB/octave Butterworth or 24 dB/octave Linkwitz-Riley
• continuously variable cutoff frequency selection from 50 - 500 Hz
• defeatable
• Infrasonic Filter: 24 dB/octave Butterworth @ 30 Hz, defeatable

Power Output

• Rated Power: 600 W RMS @ 2 ohm (14.5V)
• Rated Power 14.4 V: 400W RMS x 1 @ 4 ohms 600W RMS x 1 @ 2 ohms
• Rated Power 12.5 V: 300W RMS x 1 @ 4 ohms 500W RMS x 1 @ 2 ohms
• THD at Rated Power: 1% @ 2 ohm

Specification

• S/N Ratio: >87 dB referred to rated power (A-weighted, 20 Hz-20 kHz noise bandwidth)
• S/N Ratio: >67 dB referred to 1W (A-weighted, 20 Hz-20 kHz noise bandwidth)
• Frequency Response:     7 Hz - 500 Hz (+0, -1dB)
• Damping Factor: >1000 @ 4 ohms / 50 Hz
• Damping Factor: >500 @ 2 ohms / 50 Hz
• Input Range:     100mV - 4V RMS
• Dimensions (L x W x H): 8.52 in. x 7.09 in. x 2.05 in.
• Dimensions (L x W x H): 217 mm x 180 mm x 52 mm

NexD™ Switching Technology

Summary:
NexD™ amplifier technologies produce exceptional audio quality, unsurpassed total efficiency and high power from very compact amplifier designs.
Detailed Information:
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.