JL Audio XD800/8 v2 800 Watt 8 Channel Amplifier (XD800/8v2)
The JL Audio XD800/8 v2 is the industry’s first Class D amplifier to offer eight channels of full-range output capability and is capable of delivering a staggering 100 watts to each of its eight channels @ 2 ohms (14.4V, 1% THD). The XD800/8v2’s breakthrough that makes this much power possible in such a small chassis is our NexD™ ultra-high-speed switching design, which allows for full bandwidth Class D operation with extremely low distortion and outstanding efficiency.
The JL Audio XD800/8 v2 includes a 12 dB / octave filter for each channel bank, which can be configured as a low-pass or high-pass filter, and offers continuously variable cutoff frequency selection from 50-500 Hz.
The JL Audio XD800/8 v2 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), you have the ability to control the level of two, four, or all eight of the amplifier’s channel levels from the driver’s seat.
The JL Audio XD800/8 v2 can be used:
Eight-channel Satellite Amp: drive four pairs of speakers with 75 W x 8
Big Four-Channel Satellite Amp: bridge to produce 200W x 4 @ 4″
Six-Channel System Amp: drive front and rear satellites with 75 W x 4 @ 4″, plus two 4″ subwoofers with 200 W each
Staggered Six-Channel Satellite Amp: drive front speakers with 200 W x 2 @ 4″, plus four 4″ speakers with 75 W each
Staggered Five-Channel Satellite Amp: drive three front speakers with 200 W @ 4″ + rear speakers with 75 W x 2
Four-Channel System Amp: drive left and right speakers with 200W x 2 @ 4″, plus two 4″ subwoofers with 200W each
This amplifier features a black powder-coat finish and a gasketed, brushed aluminum cover for the controls.
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
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.