NAKAMICHI NBF25.5A - 9.2" Active Aluminum Subwoofer with Built-In 150W Amplifier
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.
Original: $328.44
-70%$328.44
$98.53Product Information
Product Information
Shipping & Returns
Shipping & Returns
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.
