Nakamichi NKTE1200.1 User Manual
CLASS-D MONO BLOCK POWER AMPLIFIER
Introduction
Thank you for your purchase of a Nakamichi product. We warmly 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
- 2. Amplifier
- 3. Mounting Screw (Φ5x16mm) - 4pc
- 4. Fuse (50A) - 2pc
- 5. Remote control - 1pc
- 6. Remote Mounting Screw (Φ3x12mm) - 2pc
Specifications
| Specification | Value |
| N-power Output@4Ω | 460W X 1 |
| N-power Output@2Ω | 720W X 1 |
| N-power Output@1Ω | 1200W X 1 |
| Max power | 7000W |
| T.H.D | ≤0.2% |
| Frequency Response | 10Hz~250Hz |
| Signal To Noise Ratio | ≥ 102dB |
| Sensitivity | 0.2~6V |
| Fuse Size | 50A X 2 |
| Unit Dimensions (LxHxW) | 200x186x55.5mm |
| Net Weight | Approx. 2.00kg |
| Box Dimensions(LxHxW) | 338x210x80mm |
| Gross Weight | Approx. 2.41kg |
All specifications subject to change without notice.
Dimensions (Unit: mm)
The amplifier has dimensions of 200mm in length, 186mm in height, and 55.5mm in width.
The front panel features various controls and input/output terminals. The rear panel includes speaker outputs, power input, fuse, and remote 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 remote terminal. This terminal does not draw heavy current, so a thinner connecting wire is acceptable. Standard 18 GAUGE wire is fine, and the standard color is blue.
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 connected to the +12V and GND terminals of the unit are larger than 8-Gauge (AWG.8).
Connection 1: 2-Channel Mode
Connect speakers to the left and right speaker outputs. Ensure correct polarity.
Connection 2: 1-Channel Mode
Connect a single speaker to the speaker outputs, bridging them if necessary. Ensure correct polarity.
Panel Controls and Features
The amplifier features several controls for audio adjustment:
- A. Infrasound Crossover Frequency Range: Controls the infrasound crossover frequency between 10Hz and 50Hz.
- B. Speaker Gain Control: Matches the amplifier's sensitivity to the source signal voltage.
- C. Low Level RCA Input: Connects to the source unit's RCA low level outputs, or via an optional adapter to speaker high level outputs. Use high-quality twisted pair car audio cables to minimize signal degradation.
- D. Phase Control: Amplifier Phase Control Selector Switch.
- E. Speaker Low Pass Crossover Frequency: Controls the low frequency of the amplifier between 50Hz to 250Hz.
- F. Bass Boost: Increases the sound level in the bass frequencies.
- G. Power and Protection Indicator: A red LED indicates a fault; disconnect and resolve before reconnecting. A blue LED indicates normal operation.
- H. GND(-): Ground Connection. Connect directly to the vehicle's metal frame, ensuring the paint is removed down to bare metal. Use the shortest possible distance. Connecting to the vehicle battery ground terminal or other ground points is recommended.
- I. REM(ON/OFF) Control Line: For low-level inputs, connect the amplifier's REM-IN to the source unit's REM-OUT. The source unit will control the amplifier's power on/off automatically.
- J. +12V = Power Supply: Connect this terminal through a fuse or circuit breaker to the positive terminal of the vehicle battery or an isolated audio system battery.
- K. Fuse: Do not use a fuse with a different value or replace it with wire or coin.
- L. Speaker Connections: Connect speakers and woofers to the terminals, ensuring correct polarity. Never connect speaker cables to the chassis ground.
- M. Remote Port: Allows adjustment of the amplifier's sound level within five meters.
Interference
All cables can create interference, with power and RCA audio cables being most susceptible. Interference is often caused by the generator, ignition, or other electronic parts. Proper wiring during setup can eliminate most of these problems. Follow these guidelines:
- Use only shielded audio cables for low-level input wiring between the amplifier and the radio's RCA output.
- Lay signal, speaker, and power cables separately, with sufficient distance between them and other car cables. If not possible, circuit and ground cables can be laid with serial cables. Keep audio and speaker cables as far away as possible. The REM cable can be laid with signal cables.
- Avoid ground loops by laying all component ground wires towards a central point in a star layout. Measure voltage at the battery and compare it with the chosen ground point and the amplifier's positive terminal to find the best central location.
- If speaker power cables pick up signals from external sources, divide the core leads and twist them together.
- If the car electrics generate noise, add an interference suppression choke to the power wiring.
- For humming noises, use thicker ground cables or add more ground cables to the chassis.
- To reduce contact resistance, solder cable ends or use multi-core cable ends, spade terminals, or gold-plated spade terminals for the lowest contact resistance.
- If these measures do not resolve the issue, a ground loop isolator may help.
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 reversed 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. | |
| Distorted Output | Loose or poor audio input | Check input connections and repair or replace as needed. |
| 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 1Ω mono, rewire speakers to achieve a higher impedance. | |
| Distorted Output (Cont'd) | Shorted speaker wires | Check speaker wire connections and repair or replace as needed. |
| 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. | |
| Poor Bass Response | Speaker are blown | Check system with known working speaker and repair or replace as needed. |
| Crossover set incorrectly | Check speaker polarity and repair as needed. Reset crossovers referring to the multi-cross crossover configuration section of this manual for detailed instructions. | |
| Distorted Output (Cont'd) | 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 for detailed instructions. |
| Impedance load to amplifier too low | Check speaker impedance load; if below 2Ω stereo or 1Ω mono, rewire speakers to achieve a higher impedance. | |
| 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. | |
| Low Bass Response | Too much current being drawn | Check speaker impedance load; if below 2Ω stereo or 1Ω mono, rewire speakers to achieve a higher impedance. |
| Short in power wire or incorrect | Check power and ground connections and repair as needed. |
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