Infinity M704A 1000W Max Power Class D Multi-Element High Performance 4-Channel 4-Ohm Marine Amplifier
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• 4-Channel Marine amplifier with two 30A ATO fuses installed
• 2 Spare 30A ATO fuses
•4 Speaker wire-to-RCA adapters
• 4 Self-tapping screws (length 2")
•Quick Connect Guide
•2 Infinity decals
New weather-resistant & high-performance Infinity Marine amplifiers deliver impressive power from a compact chassis designed to withstand outdoor environments. Available with 4-channel and 5-channel outputs. Infinity Marine amplifiers incorporate our latest amplifier topology that includes selectable all-, high-, or low-pass crossovers with variable electronic frequency adjustment for precision system tuning. Engineered for harsh marine conditions, with power and performance to meet the needs of any outdoor audio system, Infinity Marine amplifiers are the perfect match for all of your Infinity marine products.
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.
Maximum Power : 1000 Watts
Number of Channels : 4
Built In Crossovers : Yes
Channel Separation : Yes
Amplifier Class : D
Fuse Rating : 30x2 A
XP750-SE OFFER : Yes
Overview: The Infinity Marine M704A is a 4-channel amplifier designed to power speakers aboard a boat or in an environment where moisture or water spray may be present. Infinity Marine amplifiers are engineered with conformal-coated circuit boards and other protections to withstand harsh marine conditions. In addition, the amp includes stainless steel mounting hardware that is resistant to corrosion.
Protection Circuitry: The amplifier features protection circuitry for thermal overload, over/under-voltage (<9V or >16V), amplifier output circuit failure, and short circuits. The Protect LED on the top of the amp glows red if the amp goes into protection mode.
Gain: The M704A's rotary gain controls let you match the amp's input sensitivity to the output of the source unit. The input sensitivity range of the amplifier is 200mV and up. A small screwdriver (not included) is required to set the gain.
Input Level: The amp will accept low-level (line level) or high-level (speaker level) input signals. The input level switch lets you select the type of input you are using. For a high-level input, there are two settings: Hi1 and Hi2. If the audio system fails to play with an amplifier connected to its output, set the switch to the Hi2 position. The Hi2 position includes a circuit design to fool this type of factory system into "seeing" a speaker connected to its output.
Crossover: The amp features switchable crossovers that can be set to low pass (LPF), high pass (HPF), or Full Range. You can adjust the cutoff frequency of the crossover from 32Hz to 320Hz using the rotary control. There are separate crossovers for the front and rear channels.
Terminals: The Infinity M704A uses set screw terminals for the +12V power, ground, turn-on (remote) lead, and speaker outputs. The screws can be tightened/loosened with a Phillips-head or flat-head screwdriver (not provided). The tops of the terminals are covered by a rubber plug to prevent water from entering the amplifier.
Power/Ground: The +12V Power and Ground terminals will accept up to 4-gauge wire. It is recommended that you use a minimum of 8 AWG power wire to the battery, with an in-line 60A fuse installed no more than 18" from the battery terminal. An 8 AWG ground wire (minimum) is also recommended, and attached to a metal area close to the amplifier.
Fuses: The M704A has two 30A ATO (blade-type) fuses installed in the amplifier behind a removable panel. A small Phillips-head screwdriver (not included) is required to remove the panel. Two spare 30A ATO fuses are also included with the amp.
Remote Turn-On: The Remote screw terminal will accept up to 10 AWG wire. Typically, an 18 AWG wire is sufficient for the turn-on lead.
Speaker-Level Input: The amp includes four bare wire-to-RCA adapters for connecting the amp to a factory radio or aftermarket head unit without preamp outputs. You should attach each speaker wire from the head unit to each adapter and plug the adapter's RCA plug into the amp.
Line-Level Inputs: The amplifier is equipped with two pairs of RCA inputs for connecting stereo RCA patch cables from the head unit to the amp.
Pre-Out: A third pair of RCA jacks is provided to output the audio signal to a second amplifier, if desired.
Speaker Outputs: The amp features screw terminals for connecting four speakers. There are markings on the terminals for bridging the amplifier. The terminals will accept up to 10 AWG wire.
High- and low-level inputs
Selectable Output and Variable Adjustment Crossovers
Big Dynamic Power
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)
Authorized Internet Dealer
Warranty: 1 Year Onlinecarstereo.com warranty.
1 Year warranty from Onlinecarstereo.com implies that repairs must be returned to Onlinecarstereo.com, not the manufacturer. More information can be found in our help section under returns & warranties. What's not covered : Misuse, abuse, defacement, physical damage of any kind, and improper installation / operation. Video and multimedia equipment with damaged or cracked screens.Subwoofers and speakers are not warrantied if the defect is due to physical damage.
Great amp. Very powerful. I’m using this marine amp in my car to power up my two 6.5 and two 6x9. I chose this because marine amps usually are more durable and can withstand elements. So far so good. Can’t complain.
I love its design, but most importantly it works well powering up four 6.5” speakers installed on my boat. Very satisfied with my purchase!
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