Owner's Manual

Features and Benefits
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.
Infinity Marine M704A
What’s in the Box
1 x amplifier
High-level input wiring harness
2 spare fuses
2 2-color brand stickers
1 x Quick start guide
Product specifications:
Max Power: 1000W Peak
RMS Power Output @ 2Ω: 100W x 4, <1% THD+N
RMS Power Output @ 4Ω: 70W x 4, <1% THD+N
RMS Power Output, 4Ω Bridged: 100W x 2,
<1% THD+N
Signal-to-Noise Ratio: >85dB (ref 1W output @ 4Ω)
Infinity Marine M4555A
What’s in the Box
1 x amplifier
High-level input wiring harness
2 spare fuses
2 2-color brand stickers
1 x Quick start guide
Product 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)
HARMAN International Industries, Incorporated
8500 Balboa Boulevard, Northridge, CA 91329 USA
www.infinityspeakers.com
© 2018 HARMAN International Industries, Incorporated. All rights reserved. Infinity and CMMD are trademarks
of HARMAN International Industries, Incorporated, registered in the United States and/or other countries.
Other trademarks and trade names are those of their respective owners. Features, specifications and
appearance are subject to change without notice.
Multi-element high-performance, 4- and 5-channel amplifiers
Marine Amplifiers