Introduction
Thank you for your purchase of a Nakamichi product. We welcome you to the Nakamichi family! Please keep your original invoice and purchase receipt in a safe place for future service and warranty claims. You may also contact your appointed Nakamichi service agent for any future technical support requirements.
Accessory List
| 1. User Manual | 1pc |
| 2. Amplifier | 1pc |
| 3. Mounting Screw (Φ4x15mm) | 4pc |
| 4. Wrench | 2pc |
| 5. High input wire | 2pc |
Specifications
| N-power Output@4Ω | 200W X 4 |
| N-power Output@2Ω | 300W X 4 |
| N-power Output@4Ω (bridged) | 600W X 2 |
| Max power | 5600W |
| T.H.D | ≤0.1% |
| Frequency Response | 20Hz-20kHz |
| Signal To Noise Ratio | ≥85dB |
| Sensitivity | 0.2~6V |
| Unit Dimensions (LxHxW) | 254x130x59mm |
| Net Weight | Approx. 2.28kg |
| Box Dimensions (LxHxW) | 329x200x88mm |
| Gross Weight | Approx. 2.51kg |
All specifications subject to change without notice.
Dimensions (Unit: MM)
The amplifier has the following dimensions: Length: 254mm, Height: 130mm, Width: 59mm.
The front panel features:
- LINE INPUT (FL, FR, RL, RR)
- GAIN controls
- CROSSOVER controls (HPF, LPF, FULL)
- FREQUENCY ADJUSTMENT knobs (50Hz-500Hz)
- HIGH INPUT terminals
The rear panel features:
- SPEAKER OUTPUT terminals (FRONT, REAR, BRIDGED)
- +12V POWER INPUT
- REM (ON/OFF) CONTROL LINE
- GND (-) GROUND CONNECTION
Power Connection Leads
Notes on the power supply:
- Connect the +12V power input lead only after all other leads have been connected.
- Ensure the ground wire of the unit is securely connected to a metal part of the car. A loose connection may cause a malfunction of the amplifier.
Control line:
- The unit is turned on by applying +12Volts to the REM terminal. This terminal does not draw heavy current, so a thinner connecting wire is acceptable. Standard 18 GAUGE wire is recommended, typically blue in color.
Speaker Connection Leads
Use the power supply lead with a fuse attached whose value is the same as the original fuse. Place the fuse in the power supply lead as close as possible to the car battery.
During full power operation, maximum current will run through the system. Therefore, make sure the leads to be connected to the +12V and GND terminals of the unit are larger than 8-Gauge (AWG.8).
Connection 1: 4-Channel Mode
Connect four speakers (2-8Ω each) to the FRONT and REAR speaker outputs.
Connection 2: 3-Channel Mode
Connect two speakers (2-8Ω each) to the FRONT speaker outputs and one speaker (4-8Ω) to the REAR bridged output.
Connection 3: 2-Channel Bridged Connection
Connect two speakers (4-8Ω each) to the FRONT and REAR bridged outputs.
Panel Controls and Features
A. LOW LEVEL RCA INPUT: These RCA input jacks connect to the source unit's RCA low-level outputs.
B. FRONT CHANNEL GAIN CONTROL: Gain control matches the sensitivity of the power amplifier to the source signal voltage.
C. HIGH LEVEL RCA INPUT: These high-level input jacks connect to the high-level output of the source unit's speaker. It is recommended to use high-quality twisted pair automotive audio wire to reduce the possibility of audio signal attenuation.
D. FRONT CHANNEL CROSSOVER CONTROL: High pass/Low pass/full frequency selector switch.
E. FRONT HIGH-PASS/LOW-PASS CROSSOVER FREQUENCY KNOB: Controls the crossover frequency within the range of 50Hz to 500Hz.
F. REAR HIGH-PASS/LOW-PASS CROSSOVER FREQUENCY KNOB: Controls the crossover frequency within the range of 50Hz to 500Hz.
G. REAR CHANNEL CROSSOVER CONTROL: High pass/Low pass/full frequency selector switch.
H. REAR CHANNEL GAIN CONTROL: Gain control matches the sensitivity of the power amplifier to the source signal voltage.
I. POWER AND PROTECTION INDICATORS: A protective red LED illuminates if the power amplifier fails. Before reconnecting the power amplifier, disconnect it and resolve the fault. The power indicator blue LED is lit when the power amplifier is operating normally.
J. SPEAKER CONNECTIONS: Connect the speakers to the output terminals, ensuring correct polarity. Never connect speaker cables to chassis ground.
K. +12V POWER SUPPLY: Connect this terminal to the positive terminal of the vehicle battery or the positive terminal of the isolated audio system battery via a fuse or circuit breaker.
L. REM(ON/OFF) CONTROL LINE: The power amplifier REM-IN should be connected to the REM-OUT of the source unit. The source unit will control the power amplifier to switch on or off automatically.
M. GND (-) GROUND CONNECTION: Connect this terminal directly to the metal frame of the vehicle, ensuring all paint on the metal frame is stripped to bare metal. Use the shortest possible distance. It is best to connect to the vehicle battery ground terminal or any other factory grounding point.
Interference
All cables can create interference. Power and RCA audio cables are prone to interference from other sources, while remote cables are less prone. Interference is often caused by the generator, ignition, or other electronic parts or systems. Most of these problems can be eliminated by correct and careful wiring during setup. Here are some guidelines:
- Use only a shielded audio cable for wiring between the low-level input of the amplifier and the radio's RCA output.
- Lay signal, speaker, and power cables separately with sufficient distance from each other and from other car cables. If not possible, you can lay the circuit and ground cables together with serial cables. Audio and speaker cables should be as far apart as possible. The REM cable can be laid with the signal cables.
- Avoid ground loops by laying all component ground wires towards a central point in a star layout. You can find the best point by measuring the voltage directly at the battery and comparing it with the chosen ground point and the amplifier's positive terminal. If the measured voltage is only slightly different, you have found the correct central location. Otherwise, look for another point. Measure with the ignition on for earth switched on.
- If there is pickup from external electrical sources into the speaker cables, divide the core leads and twist them together.
- If there is noise from the car electrics, add an interference suppression choke into the power wiring.
- If there are humming noises, use thicker ground cables or add more ground cables to the chassis.
- To reduce contact resistance and bad/loose contacts, solder the cable ends or use multi-core cable ends, spade terminals, or others. Gold-plated spade terminals are corrosion-free and have the lowest contact resistance.
- If all these measures do not bring success, a ground loop isolator may solve the problem.
Troubleshooting
| Symptom | Possible Cause | Action to Take |
|---|---|---|
| NO OUTPUT | Low or no remote turn-on input | Check remote turn-on voltage output at amplifier and correct as needed. |
| Fuse blown | Check power wire integrity and polarity, repair as needed, and replace fuse. | |
| Power wires not connected | Check power wire and ground connections and repair or replace as needed. | |
| Audio input not connected or no output from source | Check input connections and signal integrity, repair or replace as needed. | |
| AUDIO CYCLES ON AND OFF | Speaker wires not connected | Check speaker wires and repair or replace as needed. |
| Speaker are blown | Check system with known working speaker and repair or replace speaker as needed. | |
| Thermal protection engages when amplifier heat sink temperature exceeds 90°C | Ensure proper ventilation for the amplifier and improve ventilation as needed. | |
| Loose or poor audio input | Check input connections and repair or replace as needed. | |
| DISTORTED OUTPUT | Amplifier level sensitivity set too high, exceeding maximum output capability of amplifier | Reset gain referring to the tuning section of the manual for detailed instructions. |
| Impedance load to amplifier too low | Check speaker impedance load; if below 2Ω stereo or 4Ω mono, rewire speakers to achieve higher impedance. | |
| Shorted speaker wires | Check speaker wire connections and repair or replace as needed. | |
| DISTORTED OUTPUT (CONT'D) | Speaker not connected to amplifier properly | Check speaker wiring and repair or replace as needed; refer to the installation section of this manual for detailed instructions. |
| Internal crossover not set properly for speaker | Reset crossovers referring to the multi-cross crossover configuration section of this manual. | |
| Speaker are blown | Check system with known working speaker and repair or replace as needed. | |
| POOR BASS RESPONSE | Crossover set incorrectly | Check speaker polarity and repair as needed. Reset crossovers referring to the multi-cross crossover configuration section of this manual. |
| Speaker wired wrong polarity causing cancellation at low frequencies | Check speaker polarity and repair as needed. Reset crossovers referring to the multi-cross crossover configuration section of this manual. | |
| Impedance load to amplifier too low | Check speaker impedance load; if below 2Ω stereo or 4Ω mono, rewire speakers to achieve higher impedance. | |
| DISTORTED OUTPUT (CONT'D) | Short in power wire or incorrect power connections | Check power and ground connections and repair as needed. |
| Fuse used is smaller than recommended | Replace with proper fuse size. | |
| Too much current being drawn | Check speaker impedance load; if below 2Ω stereo or 4Ω mono, rewire speakers to achieve higher impedance. | |
| Short in power wire or incorrect power connections | Check power and ground connections and repair as needed. |
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