The JL Audio MX500/4 is a compact, full-range 4-channel Class D marine/powersports amplifier built for harsh environments, featuring an IPX7 water-resistance rating (with the control cover installed). It delivers clean, reliable power for four speakers, or can be bridged to run higher-power 2-channel setups.

Key features & specs

• Total power: 500W RMS (4-channel)
• Rated power @ 14.4V, <1% THD+N: 70W x 4 @ 4Ω; 90W x 4 @ 3Ω; 125W x 4 @ 2Ω; 250W x 2 bridged @ 4Ω
• Rated power @ 12.5V, <1% THD+N: 55W x 4 @ 4Ω; 70W x 4 @ 3Ω; 90W x 4 @ 2Ω; 180W x 2 bridged @ 4Ω
• Frequency response: 20 Hz – 20 kHz (+0, -1 dB)
• Input voltage range: 250 mV–4 V (Low) or 750 mV–15 V (High); supports RCA/preamp signals and speaker-level signals (via speaker-wire-to-RCA splice/adapter)
• Crossovers: selectable high-pass or low-pass, defeatable; 35–300 Hz, 12 dB/octave
• Channel input mode: 2 / 3 / 4-channel
• Recommended protection: 50A main fuse (not included); install within 18 in (45 cm) of the battery when this is the only device on the main feed
• Minimum power/ground wire: 4 AWG
• Dimensions (W x D x H): 9.33 x 4.50 x 1.77 in (237 x 114.5 x 45 mm)
• What’s included: amplifier, (4) stainless steel mounting screws, user manual

OEM references

• JL Audio model: MX500/4
• OEM ref: 98408
• Alt. ref: 010-03106-00
• UPC: 699440984089

Installation & compatibility notes

• Designed for 12V negative-ground electrical systems only.
• Verify speaker loads and wiring before installation (supports 2Ω operation per channel and bridged operation at 4Ω, per published power ratings).
• Confirm space, cable sizing, and fuse placement before ordering/installation.