Infinity MARINE M704A


Multi-element high-performance, 4-channel amplifier

General Specifications

Max Power
1800W Peak
RMS Power Output @ 2Ω (subwoofer)
500W x 1, <1% THD+N
RMS Power Output @ 4Ω (subwoofer)
320W x 1, <1% THD+N
RMS Power Output @ 2Ω (full-range)
65W x 4, <1% THD+N
RMS Power Output @ 4Ω (full-range)
45W x 4, <1% THD+N
RMS Power Output @ 4Ω Bridged (full-range)
130W x 2, <1% THD+N
Signal-to-Noise Ratio (sub)
>80dB (ref 1W output @ 4Ω)
Signal-to-Noise Ratio (full-range)
>80dB (ref 1W output @ 4Ω)


Compact size

Infinity Marine amplifiers feature a slim chassis and a small footprint to allow for installation in tight spaces

High- and low-level inputs

Speaker-level and low-level inputs let Infinity Marine amps integrate with just about any audio input.

Selectable Output and Variable Adjustment Crossovers

Infinity Marine amps feature selectable all-, high-, or low-pass crossovers with variable electronic frequency adjustment to allow for fine-tuning multiple system configurations.

Product Value

Infinity power and performance at an affordable price point

Cosmetic Appeal

Product family look and feel to meet the needs of our Infinity customers

Conformal-Coated PCB

Infinity Marine amplifiers are engineered to withstand harsh marine conditions, with fully “marinized” circuit boards to ensure flawless power delivery, year after year

Variable Crossovers

Onboard 12dB electronic crossovers, with selectable full-range, high-pass & low-pass switching, provide tuning options for systems of any size

Big Dynamic Power

Output power is perfectly matched to meet the needs for your Infinity marine products

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