Description
NAKAMICHI NBF25.5A - 9.2" Active Aluminum Subwoofer with Built-In 150W Amplifier
Compact powered subwoofer system featuring a 9.2-inch aluminum cone driver with integrated 150W amplifier, delivering deep bass response from 20Hz to 150Hz with adjustable low-pass filter, variable bass boost up to 12dB, fixed subsonic filter, and flexible high/low level inputs for easy integration into any vehicle audio system.
Product Overview
The NAKAMICHI NBF25.5A is a professional-grade active subwoofer system combining a 9.2-inch aluminum cone driver with a powerful built-in 150W amplifier in an ultra-compact enclosure. The aluminum cone construction delivers rigid, accurate bass reproduction with minimal distortion (≤0.2% THD), while the integrated amplifier provides comprehensive tuning controls including adjustable low-pass filter (50Hz-150Hz), variable bass boost (0-12dB), and fixed 20Hz subsonic filter for optimal performance.
Important Notes:
Powered Subwoofer System: Complete all-in-one solution with built-in amplifier - no external amplifier required. Connect directly to head unit using high-level or low-level inputs.
Compact Installation: Ultra-slim 71mm height profile allows installation in tight spaces including under seats, behind seats, or in limited trunk areas where traditional subwoofer boxes won't fit.
Professional Installation Recommended: Requires proper power and ground connections, signal input wiring, and amplifier tuning for optimal performance and system integration.
Key Features
Built-In 150W Amplifier - Integrated N-Power amplifier delivers 150W continuous power output with 1500W peak capability, providing powerful bass response without requiring external amplifier installation or additional wiring complexity.
9.2" Aluminum Cone Subwoofer - Lightweight yet rigid aluminum cone construction delivers accurate, distortion-free bass reproduction with excellent transient response and minimal flexing for clean, tight low-frequency output.
Low Distortion Performance - Ultra-low ≤0.2% Total Harmonic Distortion (THD) ensures clean, accurate bass reproduction without unwanted harmonics or muddiness that degrades overall sound quality.
High Signal-to-Noise Ratio - Exceptional ≥90dB signal-to-noise ratio provides clean amplification with minimal background noise or hiss, maintaining audio clarity even at high volume levels.
Extended Frequency Response - Deep 20Hz to 150Hz frequency range captures lowest bass frequencies for full-range reproduction of music, movies, and audio content with impactful low-end extension.
Adjustable Low-Pass Filter - Variable crossover frequency control (50Hz-150Hz) allows precise integration with front stage speakers, ensuring smooth frequency transition and preventing overlap or gaps in system response.
Variable Bass Boost - Adjustable bass boost control (0-12dB) provides fine-tuning of low-frequency output level to compensate for cabin acoustics, personal preference, or music genre requirements.
Fixed Subsonic Filter - Built-in 20Hz subsonic filter protects subwoofer from inaudible infrasonic frequencies that waste amplifier power and cause excessive cone excursion without producing audible output.
Dual Input Options - Flexible high-level (0.5V sensitivity) and low-level (110mV sensitivity) inputs accommodate connection to factory head units, aftermarket receivers, or signal processors for universal compatibility.
Compact Slim Profile - Ultra-thin 71mm (2.8") height combined with compact 300mm x 235mm footprint fits under seats, behind seats, or in tight trunk spaces where traditional subwoofer enclosures cannot be installed.
3-Ohm Impedance - Optimized 3Ω voice coil impedance maximizes power transfer efficiency from built-in amplifier for maximum output capability within compact form factor.
20A Fuse Protection - Integrated 20A fuse protects amplifier circuitry and vehicle electrical system from short circuits or overload conditions for reliable, safe operation.
Technical Specifications
| Specification |
Details |
| Brand |
NAKAMICHI |
| Model |
NBF25.5A |
| Product Type |
Active Subwoofer (Powered) |
| Subwoofer Size |
9.2 inch |
| Cone Material |
Aluminum |
| Impedance |
3 Ohms |
| Amplifier Type |
N-Power (Built-In) |
| RMS Power Output |
150W |
| Peak Power Output |
1500W |
| Total Harmonic Distortion |
≤0.2% |
| Signal-to-Noise Ratio |
≥90dB |
| Frequency Response |
20Hz - 150Hz |
| Low-Pass Filter |
50Hz - 150Hz (Adjustable) |
| Bass Boost |
0 - 12dB (Variable) |
| Subsonic Filter |
20Hz (Fixed) |
| Input Sensitivity (High Level) |
0.5V |
| Input Sensitivity (Low Level) |
110mV |
| Input Types |
High Level & Low Level (RCA) |
| Fuse Rating |
20A |
| Dimensions (L x W x H) |
300mm x 235mm x 71mm |
| Mounting |
Under Seat / Behind Seat Compatible |
Frequently Asked Questions
Q: Does this subwoofer need an external amplifier?
A: No! The NBF25.5A is a powered/active subwoofer with a built-in 150W amplifier integrated into the enclosure. Simply connect power, ground, and signal input from your head unit - no external amplifier required. This simplifies installation and saves space.
Q: Will this fit under my car seats?
A: The NBF25.5A's ultra-slim 71mm (2.8") height makes it ideal for under-seat installation in most vehicles. Measure your under-seat clearance first: you need at least 75-80mm clearance accounting for mounting and ventilation. The 300mm x 235mm footprint fits most sedan and SUV under-seat spaces.
Q: Can I connect this to my factory stereo?
A: Yes! The NBF25.5A features both high-level (speaker level) and low-level (RCA) inputs. High-level inputs allow direct connection to factory head unit speaker outputs without requiring RCA outputs or line-out converters. Low-level inputs work with aftermarket head units with subwoofer RCA outputs.
Q: How do I tune the bass boost and crossover settings?
A: Start with low-pass filter set to 80Hz and bass boost at 0dB. Play familiar music and gradually adjust low-pass filter (50-150Hz) until bass blends smoothly with front speakers without overlap. Then adjust bass boost (0-12dB) to desired impact level. The subsonic filter is fixed at 20Hz and requires no adjustment.
Q: What power and ground wire do I need for installation?
A: The 20A fuse rating requires minimum 10-gauge (10AWG) power wire from battery positive terminal with inline fuse holder, and matching 10-gauge ground wire to solid chassis ground point. Use proper crimp terminals and ensure all connections are clean and tight for reliable operation and maximum power delivery.
Legendary Products & Support From Authorized Dealers
When you choose Frankies BrandBeast, you're choosing quality and performance. But just as important as what you buy is where you buy it from. Here's why purchasing from an authorized dealer is always the right choice:
▸ Expert Knowledge & Training
Only authorized Frankies BrandBeast dealers are factory-trained to sell and install our products. They have the expertise to ensure your purchase is set up correctly and meets your expectations.
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We offer one of the best warranties in the industry, but only purchases made through authorized dealers are covered. Don’t be misled by unauthorized sellers who can’t provide genuine warranty support.
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If you ever run into an issue, you’re backed by Frankies BrandBeast’s official manufacturer’s warranty. No need to deal with overseas returns—our local team takes care of everything quickly and efficiently.
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Buying from an authorized dealer ensures you’re getting genuine products, full warranty coverage, and expert support. Ask yourself—is saving a few bucks worth losing all that?
Choose wisely. Buy from Frankies BrandBeast today!
