See all parts that fit your 2003 Vitara
320W Peak Class D Nautic Series 4 Channel Marine and Powersports Amplifier
• 40 watts x 4 channel @ 4 ohm
• 80 watts x 4 channel @ 2 ohm
• Total Power: 320 watts
• Class D 2 ohm Stable 4-Channel Amplifier
6.75" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto with Backup Camera
$329.99
6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto, and SiriusXM Ready
$349.99
List price $420.00
7" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay and Android Auto (SiriusXM Ready)
$329.95
List price $349.95
6.8" Double DIN Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay, and Android Auto (SiriusXM Ready)
$599.99
List price $750.00
270W Peak (90W RMS) 5.25" Club Series 2 Way Coaxial 3-ohm Speakers
$74.99
List price $129.95
Infinity Reference 5030cx (REF5030CX)
390W Peak (130W RMS) 5.25" Reference Series 2-Way 3-ohm Component Speaker System
$99.95
List price $249.95
Single DIN Digital Media Receiver with Bluetooth (SiriusXM Ready)
$149.95
List price $180.00
6.8" Double DIN Touchscreen Digital Multimedia Receiver with Bluetooth, Apple CarPlay, Android Auto (Sirius XM Ready)
$399.00
List price $600.00
10.1" Single DIN Floating Touchscreen Digital Multimedia Receiver with Bluetooth, Wireless Apple CarPlay, and Wired Android Auto (SiriusXM Ready)
$798.00
List price $999.99
• 40 watts x 4 channel @ 4 ohm
• 80 watts x 4 channel @ 2 ohm
• Total Power: 320 watts
• Class D 2 ohm Stable 4-Channel Amplifier
The MB Quart NA2-320.4 is a compact, marine-grade Class D 4-channel amplifier designed for powerful, reliable performance in harsh environments. Built to IPX5 and ASTM standards with conformal-coated circuitry, corrosion-resistant terminals, and an aluminum heat sink, it’s engineered to withstand moisture, salt spray, and high temperatures. Features like Q-Stasis noise-reduction pre-amplification, 3-way protection circuitry, signal-sensing turn-on, and flexible four-channel or bridged mono operation provide clean, stable power and easy system integration. Compact and installation-friendly with quick-disconnect wiring, this amplifier is ideal for marine, powersports, or outdoor audio systems needing durability and clarity.
MB Quart NA2-320.4 owner's manual
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(newest, current model)
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(previous model, replaced by MB Quart NA2-320.4)
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• 80 watts x 4 channel @ 4 ohm
• 125 watts x 4 channel @ 2 ohm
• Bridged: 250 watts x 2 channel @ 4 ohm
• Total RMS Power: 500 watts
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• Bridged: 250 watts x 2 channel @ 4 ohm + 600 watts x 1 channel @ 2 ohm
• Total RMS Power: 1100 watts
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• Total RMS Power: 1700 watts
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Manufacturer:
Model Number:
NA2-320.4
Weight:
2.16lbs
Internal SKU:
na23204
Internal Product ID:
128343
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Universal Remote Bass Level Control Knob
Flush Mount & Universal via RCA. Works with any amp, controls your bass output
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$7.99
List price $14.99
Add a 4-channel amplifier without replacing your factory radio
(2)
$27.99
List price $31.24
Add a 4-channel amplifier without replacing your factory radio
(31)
$21.99
List price $23.74
NVX XIX45 X-Series RCA Interconnect Cable
16.4 ft. of 4-Channel X-Series RCA Cable with Dual Twisted Pair Hyper-Flex Technology
(24)
$23.99
List price $28.99
NVX V-Series RCA Interconnect Cable
19 ft. of 4-Channel RCA cable with dual twisted-pair conductors
(35)
$15.99
List price $32.99
NVX XIV45 4-Channel RCA Audio Interconnect Cable
5 Meters (16.4 ft.) 4-Channel RCA Audio Interconnect Cable with Dual Twisted Pair Hyper-Flex Technology
(27)
$16.99
List price $29.99
All-in-one cable for speaker and amp installation (20 feet)
(2)
$29.99
List price $47.99
75 ft. of True 16 Gauge 100% Copper EnvyFlex Speaker Cable/Wire
(21)
$34.99
List price $44.99
80 Amp Smart Relay Isolator (XSBI80)
Smart isolator - Monitors and auto-charging feature!
(2)
$24.99
List price $49.99
Great for isolating a second batter making it dedicated to the stereo system
(10)
$15.99
List price $19.99
200 Amp Smart Relay Isolator (XSBI200)
Smart isolator - Monitors and auto-charging feature!
(6)
$49.99
List price $79.99
200 Amp Relay Isolator (BIR200)
Great for isolating a second batter making it dedicated to the stereo system
(17)
$49.99
List price $59.99
500 Amp Smart Relay Isolator (XSBI500)
Smart isolator - Monitors and auto-charging feature!
(8)
$89.99
List price $109.99
500 Amp Relay Isolator (BIR500)
Does not create a voltage drop to the second battery like conventional isolators
(36)
$79.99
List price $95.99
True 1.0 Farad 20V Capacitor with Digital Read-out, Built-in Distribution Block
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$109.99
List price $131.99
1.0 Farad Capacitor with Digital Red Display for up to 1000W Max
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$38.99
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Belva Nine Function Digital Multimeter
Perfect for any installation and troubleshooting
(7)
$9.99
List price $29.99
High Quality Element Resistant AGU Fuse Holder
Belva BAGUH2 AGU Fuse Holder
(2)
$4.99
List price $9.99
Modular Linkable ANL Fuse Block
Modular Linkable ANL Fuse Block
(4)
$14.99
List price $59.99
4 Pack of 80 Amp Nickel-Plated MANL Fuse
Mini-ANL (MANL/AFS) 80A Nickel Plated Fuses
(19)
$3.99
List price $8.99
4 Pack of 100 Amp Nickel-Plated MANL Fuse
Mini-ANL (MANL/AFS) 100A Nickel Plated Fuses
(17)
$3.99
List price $8.99
4 Pack of 150 Amp Nickel-Plated MANL Fuse
Mini-ANL (MANL/AFS) 150A Nickel Plated Fuses
(11)
$3.99
List price $8.99
2 Pack of 100 Amp Nickel-Plated ANL Fuse
ANL 100A Nickel plated for better power transfer
(8)
$3.99
List price $7.99
2 Pack of 200 Amp Nickel-Plated ANL Fuse
Two fuses per order. High quality 200 Amp ANL Fuses
(22)
$3.99
List price $7.99
2 Pack of 300 Amp Nickel-Plated ANL Fuse
Two fuses per order. High quality 300 Amp ANL Fuses
(19)
$3.99
List price $7.99
Pair of 10 Gauge Spade Terminals, #8 Opening
Spade Terminals • 10 Gauge • 1 Red & 1 Black • Nickel Plated
(4)
$1.99
List price $3.99
Marine Grade Bluetooth Audio Controller/Receiver
Marine Grade Bluetooth Audio Controller/Receiver
(10)
$49.99
List price $62.49
Universal Bluetooth Audio Receiver & Volume/Playback Controller Knob
(15)
$59.99
List price $99.99
MTX Audio THUNDER65 with Speaker Installation Kit
240W Peak (120W RMS) 6.5" 2-Way Thunder Series Coaxial Speakers w/ Silk Tweeters + NVX Speaker Baffles, Sound Dampening, Roller, and Panel Removal Kit
(255)
$183.48
List price $257.70
Polk Audio DB462 with Sound Dampening Kit
300W Peak (100W RMS) 4" x 6" DB+ Series 2-way Marine Coaxial Speakers with Sound Dampening
(53)
$99.99
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Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:
Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.
