About the MB Quart NA3-560.4
For music on the go
For music on the go
Whether cruising through waves, sand, or mud — you want to hear your tunes clearly over the noise of having fun. MB Quart's NA3-560.4 marine amplifier can send four speakers 70 watts each to keep the music playing no matter where you are. This rugged and compact amplifier utilizes a number of technologies that ensure normal operation no matter what the conditions are — like over/under voltage protection, thermal slow-down (not shut-down), and current limiting on the outputs to protect speakers.
Versatile amp
You can configure this amplifier as a 2-channel amp and send 280 watts each to a pair of tower speakers, for example. In 3-channel mode the amp can power a pair of speakers with 70 watts each and a sub with 280 watts. The onboard variable tone controls let you tailor the sound to match your particular speakers and subs.
Marine tough
Three decades of marine and powersports audio expertise goes into making each MB Quart marine amplifier. Conformal coating protects the internal circuits from water and dirt, while stainless-steel hardware resists corrosion in even the saltiest environments. MB Quart designed and tested this amp to stand up to the toughest conditions on the water and off the beaten path.
Product highlights:
- 4-channel marine amplifier
- 70 watts x 4 at 4 ohms
- 140 watts x 4 at 2 ohms
- 280 watts x 2 bridged at 4 ohms
- variable low- and high-pass filters (50-250 Hz, 12 dB/octave)
- variable bass boost (0-9 dB at 45 Hz)
- conformal-coated circuit board
- weather-resistant construction
More Info:
- preamp and speaker-level inputs
- selectable signal-sensing turn-on with speaker-level input
- wiring, fuse, and hardware not included with amplifier
- 10-gauge power and ground leads and a 35-amp fuse recommended
- dimensions: 10"W x 1-1/2"H x 4"D
- warranty: 1 year
- MFR # NA3-560.4
What's in the box:
MB Quart NA3-560.4 owner's manual
- 4-Channel amplifier
- 10" Power harness
- 10" Speaker output harness
- Adhesive backed MB Quart logo panel
- Four 3/4" Screws
- 2.5mm Allen wrench
- Quick start installation guide
- Remote turn-on note
- MB Quart logo installation note
- Window sticker
Customer reviews for MB Quart NA3-560.4
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Average review:
4.5 out of 5 starsCustomer photos
This review was collected as part of a promotion
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More details on the MB Quart NA3-560.4
Features & specs
| Performance | ||
|---|---|---|
| RMS Power Output (Watts x Channels) | 70 x 4 | |
| Frequency Response at Rated RMS Power | --- | |
| THD at Rated RMS Power | 0.2% | |
| Signal to Noise Ratio | 90 dB | |
| Input Voltage | N/A | |
| Peak Power Output (Watts x Channels) | N/A | |
| Power at 2 Ohms (Watts x Channels) | 140 x 4 | |
| Bridged Power (Watts x Channels) | 280 x 2 | |
| Minimum Impedance Bridged | 4 | |
| Minimum Impedance Unbridged | 2 | |
| Features | ||
| Amplifier Class | AB | |
| Low-Pass Crossover Frequency | 50-250 Hz | |
| Low-Pass Slope (dB/octave) | 12 dB/octave | |
| High-Pass Crossover Frequency | 50-250 Hz | |
| High-Pass Slope (dB/octave) | 12 dB/octave | |
| Bass Boost | 0-9 dB | |
| Bass Boost Frequency | 45 Hz | |
| Fan Cooled | No | |
| Fuse Rating | 35 | |
| Speaker Level Inputs | Yes | |
| Preamp Outputs | No | |
| Height (inches) | 2-1/4 | |
| Width (inches) | 11-5/16 | |
| Depth (inches) | 5-7/8 | |
| Parts Warranty | 1 Year | |
| Labor Warranty | 1 Year | |
Product Research
Features
Overview: The NA3-560.4 4-channel amplifier is effectively two full range 2-channel amps built into one chassis. Each pair of channels, labeled channels 1/2 and 3/4, is independently bridgeable, so the amp can be wired as 4-channel, 3-channel, or 2-channel.
Control Panel: The control panel is protected by a cover to help keep the controls dry, and to prevent unwanted adjustments. The cover screws are removed with the included 2.5 mm Allen wrench. The rotary controls and recessed slide switches require the use of a narrow flat blade screwdriver (not included) to make adjustments. The channel 1/2 and 3/4 sections of the amplifier have independent, identical gain, crossover, and bass EQ controls.
- Input Mode: 2-position switch; 2-channel (all four output channels fed using the channel 1/2 inputs), 4-channel (discrete inputs used for all four channels)
- Turn-on Mode: 2-position switch; Remote (turns on when triggered by +12 volts DC on the blue wire), DC Sense (turns on/off with the presence of a speaker level input)
- Gain: rotary controls; variable from 200mV to 9V
- Crossover Type: 3-position switches; select low-pass, high-pass, or full-range
- Crossover Frequency: rotary controls; variable from 50 Hz to 250 Hz
- Bass EQ: rotary controls; variable from 0 to +9 dB
Connections:
- Speaker Outputs: 10" eight wire harness; plugs into 6" pigtail attached to the amp; 18-gauge wire
- Power: 10" three wire harness;
plugs into 6" pigtail attached to the amp
- +12 Volts: 10-gauge red wire
- Ground: 10-gauge black wire
- Turn-on: 18-gauge blue wire
- RCA Inputs: two pair of stereo RCA inputs, each on the end of a 16" pigtail attached to the amp; compatible with preamp level and speaker level signals (speaker wire to RCA adapter required when using speaker level inputs)
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