MB Quart MBQ-NA3-560.4 | Four Channel Amplifier | Waterproof NA3

Quick answer

The MB Quart MBQ-NA3-560.4 is a four channel Nautic amplifier built for boats, with marine specific connectors and a gloss white epoxy finish.

MB Quart Australia rates it at 4 x 70 watts RMS into 4 ohms and 4 x 140 watts into 2 ohms.

Problems it solves

• Spray and wash down on an open deck. The amp is rated IPX5 and its output connections are sealed and grommeted.
• Fiddly tuning on a boat that rocks. Crossover, bass boost and input sensitivity all sit together under the top mounted cover.
• No spare remote wire behind the helm. DC Signal Sense turns the amp on when it sees a signal on the RCA inputs.

Specifications

• RMS power, 4 ohm: 4 x 70W
• Power, 2 ohm: 4 x 140W
• Maximum power: 560W total
• Channels: 4, or 2 channel mode
• Topology: Class SQ (Class A/B)
• Crossover: Switched HPF, full or LPF, 50Hz to 250Hz, 12dB per octave
• Turn on: DC Signal Sense, can be switched off
• Water rating: IPX5
• Finish: Gloss white epoxy
• Protection display: LED overload and speaker short indicators

Fitment and compatibility

Boats, PWC and other marine or powersport setups with four speakers, or a pair of speakers and a sub in 2 channel mode. Find it a mounting spot clear of standing water.

Install notes

Use the RCA inputs, or high level inputs through the auto sense feature. Keep the covers shut on any RCA jacks you leave empty, then set the crossover and gain under the top cover.

Warranty

MB Quart Australia gives a 2 year limited warranty on amplifiers from the date of purchase. This comes with the manufacturer's warranty through the Australian distributor. See the manufacturer's terms for details, plus our guarantees under the Australian Consumer Law.

FAQ about the MBQ-NA3-560.4

Will the MBQ-NA3-560.4 suit a factory head unit with no RCA outputs?

Yes. It takes high level speaker inputs, and auto sense turns it on from that signal.

Does the MBQ-NA3-560.4 need a remote turn on wire to be connected?

Not always. DC Signal Sense switches it on from the RCA signal, and that feature can be turned off. Boats, PWC and other marine or powersport setups with four speakers, or a pair of speakers and a sub in 2 channel mode.

Is the MBQ-NA3-560.4 strong enough for four wakeboard tower pods at 4 ohms?

MB Quart Australia rates it 70W RMS per channel at 4 ohms, so check the pods are happy at that level.

Also worth a look: Marine Amplifiers and MB Quart MBQ-NA3-600.6 Amplifier.