JL Audio 98408

MX500/4 500 Watt 4 Channel Class D Full-Range Amplifier

Overview

4-Channel Class D Full-Range Amplifier, 125 W x 4 @ 2 Ω / 90 W x 4 @ 4 Ω - 14.4V Engineered specifically for powersports applications, the 4-channel MX500/4 amplifier employs our high-speed NexD™ switching design to deliver plenty of clean power, without straining charging systems. Its tiny, cast aluminum chassis is highly resistant to corrosion, with an IPX6 water-resistance rating, making it perfect for motorcycles, ATV’s or other utility vehicles.
Generating a solid 90W x 4 into 4 ohms (14.4V, 1% THD), the MX500/4 is fully bridgeable, so it can be used as a 3-channel amplifier, or as a 2-channel amplifier producing a potent 180W x 2 into 4 ohms.
Other features include independent front and rear crossovers with selectable full-range, high-pass or low-pass filter controls and a dual-range input section that accepts a wide range of input voltage levels, from line-level all the way to high-power speaker level signals.
This amplifier features a black powder-coated finish, a gasketed cover for the controls and stainless steel hardware for durability. Rated Continuous (RMS) Power @ 14.4 V

• @ 4 Ω 70 W RMS x 4
• @ 2 Ω 125 W RMS x 4
• Bridged @ 4Ω 250 W RMS x 2

Rated Continuous (RMS) Power @ 12.5 V

• @ 4 Ω 55 W RMS x 4
• @ 2 Ω 90 W RMS x 4
• Bridged @ 4Ω 180 W RMS x 2

General Specifications

• Frequency Response 20 Hz - 20 kHz (+0, -1dB)
• S/N Ratio, referred to highest rated power >88 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth)
• S/N Ratio, referred to 1 W >70.5 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)
• Damping Factor @ 4 Ω >92 / 50 Hz
• Damping Factor @ 2 Ω >43 / 50 Hz
• THD+N @ Rated Power <1% @ 2 Ω per Ch.
• Input Voltage Range @ RCA Inputs Switchable from 250 mV - 4 V RMS (Low) to 750 mV - 15 V RMS (High)
• Min.Copper Power / Ground Wire Gauge 4 AWG wire
• Fuse Rating 50 A (AFS, AGU or MaxiFuse™)

Signal Processing

• Filter Mode(s): Low-Pass or High-Pass
• Filter Slope(s): 12 dB/octave
• Filter Frequency Range: 35 Hz - 300 Hz
• Detented, Calibrated Filter Freq. Potentiometers: Yes
• Filter Defeat Function :Yes
• Remote Level Control: No
• Remote Level Modes: N/A
• Channel Input Mode Switch: Yes (2/3/4 ch.)
• Pass-Through Preamp Output: None
• Source Channel Selection for PreOuts: N/A

Physical Specifications

• Height (H) 1.77 in / 45 mm
• Width (W) 9.33 in / 237 mm
• Depth (D) 4.50 in / 115 mm

Technology

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.

Differential-Balanced Inputs

Summary:
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.
Detailed Information:
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.

Kicker KMA600.6 6-Channel Weather-Resistant Marine Amplifier

Three Zones of Fun
Using a Class-D power plant, this amp features a variable bass boost with KickEQ™, giving you as much as 6dB of extra bump on the Amp 3 channels. Powering as many as 12 speakers, this amplifier makes your entire boat sound like a floating concert! A powerful 12dB crossover is also included, letting you quickly tune your system to perfection. Highlights

• Ultra-Efficient Class D Design
• 750 Watts of Dynamic Power
• Three Zones of Control
• Six-Channel Amplifier with Bridging Capability
• Conformal-Coated Circuit Board
• Variable 12dB Crossover
• KickEQ™ Variable 6dB Bass Boost
• Real Marine™ ABYC/NMMA-Compliant Power Connections
• 316L Stainless-Steel Hardware Included

Specifications
POWER [watts/ch], 2 OHM STEREO: 100 x 6
POWER [watts/ch], 4 OHM STEREO: 50 x 6
POWER [watts/ch], 4 OHM BRIDGED MONO: 200 x 3
DYNAMIC POWER [watts]: 750
Dimensions [in]: 2-5/16 H x 7-1/8 W x 13-15/16 L
FREQUENCY RESPONSE [Hz]: 10-20k, +0/-1dB
INPUT SENSITIVITY: High Level 250mV-10V / Low Level 125mV-5V
SIGNAL-TO-NOISE RATIO: >95dB, a-weighted, re: rated power
ACTIVE CROSSOVER: (amp 1 and amp 2) 12dB/octave, variable 0-200Hz, HP only; (amp 3) 12dB/octave, variable 50-200Hz, Off/HP/LP
SUBSONIC FILTER: (amp 3 only) 24dB/octave, high pass fixed @ 25Hz
KickEQ™ BOOST: (amp 3 only) Variable 0-6dB, centered @ 40Hz

Kenwood KAC-M5024BT Compact 4-Channel Marine/Powersports Amplifier

KEY FEATURES

• IP67/IP66 Certified Waterproof & Dustproof
• RMS 50W x4 (4Ω)
• RMS 75W x4 (2Ω)
• 7 Selectable EQ Presets
• Wired Remote Control Included
• Built-in Bluetooth with aptX
• RCA Line Output Terminals for System Expansion
• Dims - (W)7-13/16” x (H)1-15/16” x (D)4-1/8”

WaterPROOF & DustPROOF
IPX7/IPX6/IP6X certified. The amplifier can be submerged in up to 3.3 feet of water for 30 minutes, and can resist high-pressure, heavy sprays of water. Salt Spray PROOF
ASTM B117 salt spray (or salt fog) corrosion testing ensures the amplifier will not corrode or fail in saltwater and other harsh environments. Vibration PROOF
Thick 1/4" die-cast frame suppresses vibration. Equipped with the Intuitive KENWOOD Music Mix
Up to 5 Bluetooth® devices can be connected to the amplifier at the same time, allowing you to take turns streaming music with your friends and family. High Quality Bluetooth Streaming
Compatible with high quality codecs such as aptX and AAC, allowing you to be entertained with superior music playback.

ULTIMATE Performance

Increased Power Flow
Metal studs enable high current flow for connections between the amplifier and battery, resulting in powerful bass reproduction and enhanced overall sound quality. High Quality Capacitors
PMLCAP's (Polymer Multi-Layer Capacitors) are utilized in the LC filter circuits to decrease distortion, ensuring clear detail for a truer to life sound. Magnetic Shielding
Magnetic shields for the output coils reduce radiated noise, further contributing to smooth and accurate sound. SMART Remote Control
The Bluetooth antenna is housed inside the remote control, effectively providing a solid and sensible range for device connectivity, ensuring you stay connected to the music. SMART Remote Control
The Bluetooth antenna is housed inside the remote control, effectively providing a solid and sensible range for device connectivity, ensuring you stay connected to the music. EASY Sound Control
With an easy to access volume knob, separated buttons with multi-controls, & LED indicators, this remote is your perfect companion. 7 Selectable EQ Presets
You can choose your favorite sound setting from 7 EQ Presets.
1:Natural, 2;Rock, 3:Pops, 4:Easy, 5:Top40, 6:Jazz, 7:Powerful System EXPANSION Ready
The KAC-M5024BT has RCA outputs to expand the system to connect to an additional amplifier or powered subwoofer. You can even control the output level from the remote control by pressing the PRE-OUT button, then turning the volume knob.

JL Audio 98407

MX500/1 Monoblock Class D Full-Range Amplifier, 500 W Engineered specifically for powersports applications, the MX500/1 monoblock amplifier employs our high-speed NexD™ switching design to pack a serious full-range punch, without straining charging systems. Its tiny, cast aluminum chassis is highly resistant to corrosion, with an IPX6 water-resistance rating, making it perfect for motorcycles, ATV’s or other utility vehicles.
With a robust 500W of clean power into a 2-ohm load (14.4V, 1% THD), use one to drive a subwoofer, or grab a pair to deliver stunning output to a subwoofer system or full-range satellites. The MX500/1 also features an adjustable low-pass crossover, a bass boost EQ, variable infrasonic filter and output polarity switch.
Its dual-range input section accepts a wide range of input voltage levels, from line-level all the way to high-power speaker level signals. With the addition of an M-RBC-1 remote level control (sold separately), subwoofer output can be directly controlled from the driver’s seat.
This amplifier features a black powder-coated finish, a gasketed cover for the controls and stainless steel hardware for durability.

Specifications

Rated Continuous (RMS) Power @ 14.4 V

• @ 4 Ω 300 W RMS x 1
• @ 3 Ω 400 W RMS x 1
• @ 2 Ω 500 W RMS x 1
• @ 1.5 Ω N/A

Rated Continuous (RMS) Power @ 12.5 V

• @ 4 Ω 250 W RMS x 1
• @ 3 Ω 300 W RMS x 1
• @ 2 Ω 400 W RMS x 1
• @ 1.5 Ω N/A

General Specifications

• Frequency Response 20 Hz - 12 kHz (+0, -1dB)
• S/N Ratio, referred to highest rated power >97 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth)
• S/N Ratio, referred to 1 W >70 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)
• Damping Factor @ 4 Ω >115 / 50 Hz
• Damping Factor @ 2 Ω >54 / 50 Hz
• THD+N @ Rated Power <1% @ 2 Ω
• Input Voltage Range @ RCA Inputs Switchable from 250 mV - 4 V RMS (Low) to 750 mV - 15 V RMS (High)
• Min.Copper Power / Ground Wire Gauge 4 AWG wire
• Fuse Rating 50 A (AFS, AGU or MaxiFuse™)

Signal Processing

• Filter Mode(s): Low-Pass only
• Filter Slope(s): 24 dB/octave
• Filter Frequency Range: 40 Hz - 400 Hz
• Detented, Calibrated Filter Freq. Potentiometer: Yes
• Filter Defeat Function: Yes
• Infrasonic Filter: 20 Hz - 40 Hz, variable
• Bass Boost: EQ 0 to +12 dB @ 43 Hz
• Output Polarity Switch: Yes
• Remote Subwoofer Level Control: Optional (M-RBC-1)
• Remote Bass EQ Boost Control: No
• Pass-Through Preamp Output: None

Physical Specifications

• Height (H) 1.77 in / 45 mm
• Width (W) 9.33 in / 237 mm
• Depth (D) 4.50 in / 115 mm

Technology

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. Differential-Balanced Inputs Summary:
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. Detailed Information:
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.