The MB Quart NA4-400.2 is a 400 watt 2-channel Nautic amplifier for powersports and marine audio, with waterproof potted internals and quick release connectors. It is a compact full range Class D design rated IP67, so it can live in a UTV, boat or RV where water and dust reach the electronics.
As a 2 channel marine amp, it is sized to drive a pair of tower speakers; a tower speakers amp needs clean power at volume. It also works as a UTV amplifier, UTV amp or boat amplifier, and as a general waterproof amplifier or marine amp. Among MB Quart amplifier choices, this MB Quart amp is the 2 channel UTV amp in the Nautic line, and a step up for any marine amplifier install.
Key Features
- 400 watt max, 2 channel full range Class D operation
- 2 x 200 watts at 2 ohms
- 2 x 100 watts at 4 ohms
- IP67 waterproof and dustproof with potted internals
- Q-Stasis low noise preamplifier stage
- Quick connection power wires and RCA connections; Molex plug speaker connector
- Protection circuits for thermal, overload, DC and speaker short with lighted indicators
- 1 pair nickel-plated RCA inputs
Built To Solve: Underpowered Speakers in UTVs and Boats
- Speakers running off head unit power that distort over engine and wind noise
- Car amplifiers that fail when water, dust or vibration reach the circuit board
- No room for a large amplifier under a seat or console
- Bulky screw terminals that are slow to service
Best For: UTV, Boat and RV 2 Channel Amplifier Builds
- UTV and side-by-side audio builds that need compact waterproof power
- Boat and wake setups with marine speakers
- RV and outdoor installs where the amp sees moisture
- Two speaker or tower speaker pairs that need more power
Specifications
- Channels: 2 channel
- Power: 2 x 200 watts at 2 ohms
- Power: 2 x 100 watts at 4 ohms
- Crossover: Variable high pass 15Hz-300Hz and low pass 50Hz-300Hz, switch OFF / LPF / HPF
- Signal to noise: > 105dB
- Frequency response: 6Hz-29kHz
- Input: RCA (1 pair)
- Input sensitivity: 0.2-9V
- THD: 1.0%
- Power terminal: 12 AWG quick connector; speaker connection: Molex plug connector
- Fusing: 30A x 1
- IP rating: IP67, potted internals
- Amp dimensions: 6.8 x 3.94 x 1.77 in; amp weight 2.2 lbs
- Color: Black; warranty: 1 year
- Manufacturer Part Number: NA4-400.2
Fitment
MB Quart lists this product as universal: it is not specific to one machine. Fitment is not guaranteed for every mounting location; confirm space, mounting and wiring for your UTV, boat or RV before ordering.
FAQ
Is the MB Quart NA4-400.2 waterproof?
Yes. MB Quart states it meets or exceeds IP67 standards for waterproof and dustproof and uses potted internals that seal the components.
How much power does the NA4-400.2 make?
MB Quart rates it at 400 watts max: 2 x 200 watts at 2 ohms; 2 x 100 watts at 4 ohms.
Will it fit my UTV?
MB Quart lists the Nautic amplifiers as universal. At 6.8 x 3.94 x 1.77 inches it is compact, but confirm a mounting location and wiring path in your machine before ordering.
How do I connect it?
Power uses 12 AWG quick connectors, inputs are nickel-plated RCA, and speaker outputs use a Molex plug connector. MB Quart publishes a Nautic amplifier quick start guide.
What did it replace?
MB Quart lists the NA4-400.2 as the replacement for the NA2-400.2.
Why MB Quart
MB Quart's Nautic and Discus lines are built for open-air use on boats, UTVs and RVs, where sun, spray, dust and vibration are part of every trip. MB Quart backs this product with a 1 year warranty.
Pair the Nautic 2-Channel Amplifier With the Right Speakers
Match the NA4-400.2 to speakers and impedance using MB Quart's ratings, and plan a power kit and fuse for your machine or boat. Dunes 2 Dezert SXS carries MB Quart Nautic speakers, Discus amplifiers and powersports wiring kits to complete the system.
