3-Channel Class D Marine System Amplifier, 75 W x 2 @ 4 Ω + 300 W x 1 @ 2 Ω - 14.4V
This compact amplifier is ideal for a simple audiophile-grade, subwoofer / satellite system. With the M500/3, you can drive a pair of quality component speaker systems with plenty of clean power, while also delivering a stout 300 W to a subwoofer system. The breakthrough that makes this much power possible in such a small chassis is our NexD™ switching design.
The M500/3 includes a 12 dB / octave high-pass filter for its main channels, plus a variable slope low-pass filter for its subwoofer channel. Both filters offer continuously variable cutoff frequency selection from 50-500 Hz.
This marine amplifier features white and gray powder-coat finishes, a gasketed cover for the controls and stainless steel hardware for durability in the marine environment.
| Main Channels @ 4 Ω | 75 W RMS x 2 |
| Main Channels @ 2 Ω | 100 W RMS x 2 |
| Main Channels - Bridged @ 4Ω | 200 W RMS x 1 |
| Subwoofer Channel @ 4 Ω | 180 W RMS x 1 |
| Subwoofer Channel @ 3 Ω | 240 W RMS x 1 |
| Subwoofer Channel @ 2 Ω | 300 W RMS x 1 |
| Subwoofer Channel @ 1.5 Ω | N/A |
| Main Channels @ 4 Ω | 60 W RMS x 2 |
| Main Channels @ 2 Ω | 90 W RMS x 2 |
| Main Channels - Bridged @ 4Ω | 180 W RMS x 1 |
| Subwoofer Channel @ 4 Ω | 180 W RMS x 1 |
| Subwoofer Channel @ 3 Ω | 240 W RMS x 1 |
| Subwoofer Channel @ 2 Ω | 300 W RMS x 1 |
| Subwoofer Channel @ 1.5 Ω | N/A |
| Frequency Response (Main Channels) | 12 Hz - 22 kHz (+0, -1dB) |
| Frequency Response (Subwoofer Channel) | 10 Hz - 1 kHz (+0, -1dB) |
| S/N Ratio, referred to highest rated power (Main Channels) | >104 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth) |
| S/N Ratio, referred to 1 W | >84 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 (Main Channels) | <1% @ 2 Ω per Ch. |
| THD+N @ Rated Power (Subwoofer Channels) | <1% @ 2 Ω per Ch. |
| Input Voltage Range @ RCA Inputs | 100 mV - 4 V RMS |
| Min.Copper Power / Ground Wire Gauge | 4 AWG wire |
| Fuse Rating | 50 A (AFS, AGU or MaxiFuse™) |
| Filter Mode(s): Channels 1 & 2 (front) | High-Pass only |
| Filter Slope(s): Channels 1 & 2 (front) | 12 dB/octave |
| Filter Frequency Range: Channels 1 & 2 (front) | 50 Hz - 500 Hz |
| Filter Mode(s): Channels 3 & 4 (rear) | N/A |
| Filter Slope(s): Channels 3 & 4 (rear) | N/A |
| Filter Frequency Range: Channels 3 & 4 | N/A |
| Filter Mode(s): Subwoofer Channel | Low-Pass only |
| Filter Slope(s): Subwoofer Channel | 12/24 dB/octave |
| Filter Frequency Range: Subwoofer Channel | 50 Hz - 500 Hz |
| Detented, Calibrated Filter Freq. Potentiometers | Yes |
| Filter Defeat Function | Yes |
| Infrasonic Filter: Subwoofer Channel | none |
| Remote Level Control | Optional (HD-RLC) |
| Remote Level Modes | Sub Ch. or All Channels |
| Channel Input Mode Switch | Yes (2/4 ch.) |
| Pass-Through Preamp Output | Buffered |
| Source Channel Selection for PreOuts | Yes (1&2/Sum/Sub) |
| Height (H) | 2.05 in / 52 mm |
| Width (W) | 8.52 in / 216 mm |
| Depth (D) | 7.09 in / 180 mm |
| Net Weight | 4.8 lb / 2.18 kg |
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. Our NexD™ switching technology stems from our Class D expertise to deliver outstanding fidelity and efficiency, leading to compact amplifiers that deliver high power and exceptional value.
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
Summary:
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.
Detailed Information:
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 condition is generally indicated by a red “Thermal” or “Status” LED state. On VXI amplifiers, the LED ring will flash red. Once the amplifier cools down, the circuit restores full peak power output and the 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.
USA Limited Warranty: Two (2) years from the original date of purchaseWarranty Details
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Voted "Favorite Stereo Manufacturer"
– 2011 Reader's Choice Awards, Powerboat Magazine
"Our customers are thrilled with the incredible sound quality of the JL Audio systems we're installing in our boats."
– Ariel Pared, SeaVee Boats
"We tested a boat with a complete JL Audio system... The clarity and power emitted by this system was second to no other boat system on any boat, of any size, we have ever heard. It was a truly amazing experience."
– Tony Adelo, Mayor's Cup Magazine
"My JL Audio sound system can turn a bad day of fishing into a fun day on the water."
– Captain Rimmer Covington, Owner - Mexican Gulf Fishing Company