Nakamichi NBF618S-II 6×9 Inch Active Aluminum Subwoofer User Manual
- June 6, 2024
- Nakamichi
Table of Contents
Nakamichi NBF618S-II 6x9 Inch Active Aluminum Subwoofer User Manual
Dear Customer,
Congratulations on purchasing our Nakamichi mobile system product for your sound system.
This product has been designed and manufactured to Nakamichi’s exacting standards to ensure many years of audio enjoyment. For the best performance, we recommend that you have your Nakamichi product installed by an authorized Nakamichi dealer.
If you would like to install this product on your own, we recommend for you to go through this manual to familiarize yourself with all the installation requirements and procedures.
If you encounter any issues or if you have any questions on the operation of this product, please contact your nearest authorized Nakamichi dealer for assistance, or you may also contact us through our website or social media channels.
Installation of Your Product
In today’s modern vehicles, it is very easy to cause damage to existing systems through improper installation. Please follow and scrutinize all wiring diagrams to ensure that you have connected everything in its proper place.
If you find yourself uncomfortable of unfamiliar with understanding the wiring and installation diagrams or testing instructions, do contact your nearest Nakamichi dealer to perform the installation for you.
Safety Warnings and Considerations
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Clean only with a dry cloth or other similar materials.
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Install your product in a dry, well-ventilated location that does not interfere with your vehicle’s safety equipment.
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Do not block any ventilation openings when installing this product.
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Do not mount the product in the engine compartment of your vehicle or in any areas of extreme heat such as mufflers, silencers, exhaust pipes or other heat producing apparatus.
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Securely mount the product so that it does not come loose in the event of a collision or as a result of repeated vibrations that might occur during normal operation.
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Installation of the apparatus must be done with great care to prevent damage to your vehicle’s fuel lines, power, and other electrical wiring, hydraulic brake lines, and other systems. If possible, always visit your nearest Nakamichi dealer to perform the
installation. -
Do not run any wiring outside or underneath the vehicle. Keep all wires inside the vehicle.
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Take the necessary precautions when making connections to the vehicle’s battery to avoid any potential shock.
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Protect all system wires from sharp edges by carefully routing them, always use rubber grommets to protect wiring and cables whenever you are installing them through metal openings.
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Secure all wiring using cable ties or wire clamps to protect them from moving parts and sharp edges.
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This apparatus shall not be exposed to dripping or splashing, and no object filled with liquids, shall be placed on the apparatus.
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Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as the power input terminals are damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has
been dropped. -
Fuses shall be replaced only with the correct type and fuse value, and only when the apparatus is powered off.
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Exposure to high sound pressure levels may lead to permanent hearing loss. Take every precaution to protect your hearing.
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This product is designed specifically for use with 12 volt, negative- ground electrical systems only. Using this product in systems with positive ground and/or voltages other than 12V may result in damage to the product and your system.
ACCESSORY LIST
SPECIFICATIONS
PANEL CONTROLS AND FEATURES
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A. POWER STATUS LED
This bi-color LED glows green when power is on and no problems are present. If one of the protection circuits comes on, it will change to red. -
B. PHASE SHIFT
Use this switch to help compensate for time alignment problems in the system. Such problems usually result from having the subwoofer at a different distance from the listener than the other speakers in the system. -
C. AUTO POWER ON
The AUTO POWER ON{ON/OFF) is for high level (speaker-level) connections. When the switch is in the “ON” position, the subwoofer will AUTO POWER ON when there is signal input. If the amplifier detected no signal input, the amplifier will auto turn off, If you prefer to use the remote turn on/off connection, the switch is in the OFF position.
Note: Please connect the remote terminal to the remote output of head unit as Fig.2 when you hear the unit turn ON/OFF POP noise from the subwoofer. -
D. LOW PASS FILTER
This control permits you define the frequency range you want the subwoofer amplifier to receive. The subwoofer will reproduce all
sound below the frequency you set.
Note: The low pass filter frequency can be higher or lower than the standard. There have +/-20% tolerance. -
E. BASS BOOST
The BASS BOOST feature will increase the sound level in the bass frequencies. -
F. INPUT GAIN CONTROL
After you have installed your system, turn this control to minimum. Turn the head unit on (and the subwoofer will turn on via the remote connection). Turn the head unit volume to about 2/3 full level. Slowly turn up the subwoofer input gain control until you hear a small amount of distortion. Then reduce the level until the distortion is completely gone. Level the control at this setting. -
G. LOW LEVEL RCA INPUTS
Low level inputs are the recommended way to introduce the audio signal to the subwoofer if RCA outputs are present on your head
unit or other signal source (such as a sound processor). -
H. HIGH LEVEL (SPEAKER LEVEL) INPUTS
If your head unit does not have RCA outputs you can use the speaker outputs for the audio source for the subwoofer. Use the supplied cable and wire harness and connect the outputs properly as shown in the connection diagram in this manual. -
I. REMOTE LEVEL CONTROL PORT
Attach the included remote level control to control the volume level of the subwoofer independently. -
J. FUSE
Do not use a fuse with a different value and never replace the fuse with a wire or coin. -
K.POWER INPUT TERMINAL
WIRING
LOW LEVEL INPUT WIRING
Low-level (RCA) input wiring is preferred for best audio performance. Most
trunk and under-seat installations will require a 6-12 feet RCA cable. Always
use a high quality cable.
NOTE: Do not connect both the high level and low level inputs from your receiver to your amplifier at the same time!
POWER CONNECTIONS
Connect the ground terminal to the closest point on the chassis of the vehicle. Use 8 gauge (or heavier) wire to connect the ground cable.
Connect the remote terminal to the remote output of head unit using 16 gauge ( or heavier) wire.
Connect an empty fuse holder within 16″ (40 cm) of the car battery, and run 8 gauge (or heavier) cable from this fuse to the amplifier location. Then connect the fuse holder to the “BATT+” (+ 12V) connection on the subwoofer rear panel.
HIGH LEVEL INPUT WIRING
The high level input(s) should only be used when your receiver lacks RCA
outputs. If the RCA outputs are not present, connect the speaker outputs from
the receiver to the high level input connector of the amplifier. Be sure to
observe polarity to avoid audio phase problems.
NOTE: Do not connect BOTH the high level and low level inputs from your receiver to your amplifier at the same time!
REMOTE LEVEL CONTROL CONNECTION
TROUBLESHOOTING
If you experience operation or performance problems with this product, compare your installation with the electrical wiring diagram on the previous pages. If problems persist, read the following troubleshooting tips which may help eliminate the problems.
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