Nakamichi NBX251A 10" Active Subwoofer Box with Built-In Amplifier

Add powerful, clean bass to your vehicle without external amplifiers—complete plug-and-play active subwoofer solution.

Product Overview

The Nakamichi NBX251A is a premium 10-inch active subwoofer box featuring an integrated amplifier for simple, space-efficient bass enhancement. Delivering 1000W peak power and 150W continuous N-Power, this compact all-in-one solution eliminates the need for separate amplifier installation while providing deep, punchy bass response from 40Hz to 160Hz. The high-efficiency design combines a 4-ohm subwoofer with 35.5mm ASV voice coil and robust Y25 magnet structure for exceptional low-frequency performance and thermal handling. With 90dB sensitivity and compact 395mm dimensions, the NBX251A fits easily in boots, under seats, or behind seats in most vehicles while delivering professional-grade bass that transforms factory audio systems. Perfect for Australian drivers seeking powerful bass enhancement without complex amplifier installations or consuming valuable cargo space in utes, SUVs, and hatchbacks.

Key Specifications

• 10-inch active subwoofer with built-in amplifier
• 1000W peak power output
• 150W continuous N-Power (RMS equivalent)
• Frequency response: 40-160Hz
• 90dB ± 3dB sensitivity
• 4Ω impedance
• 35.5mm ASV (Aluminium Silicon Voice Coil)
• Y25 magnet: 120 x 70 x 20mm (706g / 24.9oz)
• Compact enclosure: 395 x 270/325 x 335mm
• Net weight: Approximately 10.6kg
• All-in-one active design (no external amplifier required)
• Universal vehicle fitment

Features & Benefits

Built-In Amplifier Convenience: Integrated amplifier eliminates the need for separate amplifier purchase, installation, and wiring complexity—simply connect power and audio signal for instant bass enhancement, saving installation time and reducing component costs compared to traditional passive subwoofer systems.

Powerful Bass Performance: 1000W peak power with 150W continuous N-Power delivers deep, punchy bass that brings life to music, movies, and audio content during daily commuting, highway cruising, or weekend road trips across Australia without overwhelming cabin space or draining electrical systems.

Compact Space-Efficient Design: At 395 x 270/325 x 335mm, the enclosure fits in tight spaces—under seats, behind seats, or in boot corners—preserving cargo capacity in utes, wagons, and SUVs while still delivering full-range bass performance for touring with camping gear or sports equipment.

High-Efficiency Engineering: 90dB sensitivity means the subwoofer produces significant bass output from modest power input, reducing electrical load on your vehicle's charging system and alternator—important for vehicles with limited electrical capacity or when running multiple accessories like lighting and fridges.

Professional-Grade Components: The 35.5mm ASV voice coil and substantial 706g Y25 magnet structure provide excellent thermal handling and power capacity, ensuring consistent performance during extended listening sessions without distortion, overheating, or compression even on long outback drives.

Wide Frequency Response: 40-160Hz frequency range captures the full low-end spectrum from deep sub-bass rumble to mid-bass punch, reproducing kick drums, bass guitars, electronic music, and movie soundtracks with accuracy and impact that factory speakers simply cannot deliver.

Universal Vehicle Compatibility: Standard connections and mounting configuration work with virtually any vehicle make and model—from compact city cars to full-size 4WDs—providing flexible installation options whether you're upgrading factory audio or complementing an aftermarket system.

Simple Signal Connection: Accepts line-level RCA inputs from aftermarket headunits or factory systems (with line output converter), making integration straightforward for both professional installers and experienced DIY enthusiasts without complex tuning or calibration requirements.

Technical Specs

• Type: Active Subwoofer Box (powered, built-in amplifier)
• Subwoofer Size: 10 inches
• Peak Power Output: 1000W
• Continuous N-Power: 150W
• Frequency Response: 40Hz - 160Hz
• Sensitivity: 90dB ± 3dB (1W/1m)
• Impedance: 4Ω
• Voice Coil: ASV (Aluminium Silicon) 35.5mm diameter
• Voice Coil Former: High-temperature resistant material
• Magnet Type: Y25 Ferrite
• Magnet Dimensions: 120mm x 70mm x 20mm
• Magnet Weight: 24.9oz (706g)
• Enclosure Type: Sealed/ported (verify from product specifications)
• Unit Dimensions (L x W x H): 395mm x 270mm/325mm x 335mm
• Net Weight: Approximately 10.6kg (single unit)
• Mounting: Universal (verify mounting configuration)
• Connections: RCA line-level input, power connections
• Protection: Short circuit, thermal overload (verify)

Frequently Asked Questions

Do I need a separate amplifier with this subwoofer?

No, the NBX251A is an active subwoofer with a built-in amplifier. Simply connect power (12V directly from battery with inline fuse), ground, remote turn-on, and audio signal from your headunit's subwoofer output or speaker-level connections. No external amplifier purchase or installation required.

How much power does this draw from my vehicle's electrical system?

At 150W continuous power, the subwoofer draws approximately 15-20 amps peak from your 12V system during maximum output. Most factory alternators handle this easily. Use minimum 8-gauge power cable with 20-30 amp inline fuse positioned within 450mm of battery connection for safety.

Where can I install this subwoofer in my vehicle?

The compact 395mm dimensions allow installation under front seats (some vehicles), behind rear seats, in boot corners, or in cargo areas. Ensure adequate airflow around the amplifier section for cooling and secure mounting to prevent movement during driving. Professional installation recommended for optimal placement.

Can I connect this to my factory stereo system?

Yes, but factory stereos typically don't have dedicated RCA subwoofer outputs. You'll need a line output converter (LOC) to tap into factory speaker wires and convert the signal to line-level RCA that the active subwoofer requires. Alternatively, upgrade to an aftermarket headunit with subwoofer pre-output.

Will this work with my existing aftermarket speakers and amplifier?

Absolutely. The NBX251A integrates seamlessly with aftermarket audio systems. Connect the subwoofer pre-output from your headunit (or amplifier if equipped) to the active subwoofer's RCA input. Adjust the gain control on the subwoofer to match your system's output level for balanced, cohesive bass response.

Compatible With / Goes Well With

Vehicle Types:

• Compact hatchbacks and sedans (space-efficient installation)
• Mid-size SUVs and wagons (boot installation)
• Utes and dual-cab trucks (under-seat or behind-seat mounting)
• 4WD touring vehicles (maintains cargo space)
• Universal fitment (any vehicle with 12V electrical system)

Recommended Installation Accessories:

• 8-gauge amplifier wiring kit (power, ground, remote cables)
• 20-30 amp inline fuse holder
• RCA audio cables (if not included)
• Line output converter (for factory stereo integration)
• Sound deadening material for enclosure mounting area
• Subwoofer mounting brackets or straps
• Wire management ties and grommets

Compatible Audio Components:

• Aftermarket headunits with subwoofer pre-output
• Factory audio systems (with line output converter)
• Multi-channel amplifiers with subwoofer crossover
• Component speaker systems requiring low-frequency reinforcement
• Full-range coaxial speakers needing bass extension

System Enhancement:

• Bass remote control (if supported)
• Capacitor for electrical system stabilization (high-power systems)
• Digital sound processors for precise tuning
• Additional sound deadening for improved bass response
• Secondary subwoofer for dual-subwoofer configuration (space permitting)

Caution: Ensure your vehicle's electrical system capacity supports the subwoofer's power requirements. Vehicles with undersized alternators or weak batteries may require electrical system upgrades. Professional installation strongly recommended for proper power distribution, grounding, and acoustic placement.

Weight

10.6kg per unit.