NVX XAD21 X-Series 2 Channel Amplifier User Manual

NVX XAD21 X-Series 2 Channel Amplifier

Performance

RMS Power Output@ 14.4V, :s 1% THD + N

Specifications

Tip : To obtain the best performance out of your NVX amplifiers, it is suggested that you contact an authorized NVX dealer and discuss your installation options with a professional  to ensure the best quality installation.

Installation

Mounting : Choosing a mounting location for the X-Series 2-channel amplifiers involves more than just finding a place where to install the amplifier. We suggest the following guidelines to properly mount your amplifier to your vehicle.

• Choose a mounting location where the amplifier can be well ventilated.
• Mount your amplifier in a sturdy and rigid location.
• Ensure that there are no electrical wires or fuel lines behind where you will be drilling.
• Secure the amplifier by tightening all four screws.
• Have enough room around the amplifier where you can easily connect all power and audio cables as well as make audio control adjustments.
• Avoid mounting the amplifier directly to a subwoofer enclosure as this will produce excessive vibrations which can vibrate critical solder joints or components on the circuit board to become loose.

Fig 1 THE POWER CONNECTIONS

Wiring : The X-Series 2-channel amplifier requires a direct connection to the vehicle battery to provide power for operation. Power connections should be circuit protected to protect the vehicle from any electrical short, fire hazard, amplifier damage, or even injury. If several amplifiers are connected to one main power wire connection, we recommend to electrically distribute the power connection to each amplifier with its own form of circuit protection. Before making any type of wire or cable connections to your amplifier, disconnect
the vehicle’s battery to avoid any electrical shorts. Below are recommendations for proper power cable installation and connections.

• Make the ground wire as short as possible.
• Connect the ground wire to a paint and corrosion-free, solid, metal area of the vehicle’s chassis. For a solid ground connection, an additional ground wire of the same gauge is recommended as the main power wires (or larger) between the battery’s post and the vehicle chassis.
• install an in-line fuse within 18″ of the battery’s positive terminal.
• Place an additional in-line fuse within 18″ of the amplifier.
  Note : In the event, you need to remove the amplifier from your vehicle, the ground wire should be the last wire disconnected from the amplifier, just the opposite as it was when you installed it.

Fig 2 THE SPEAKER CONNECTION

Fig3 FRONT PANEL CONNECTOR

1| RCA signal input (2 Channel)| To connect the RCA signal wire from the audio source/head unit
---|---|---
2| Crossover: Channel 1 & 2| HPF: To adjust the high pass filter’s crossover point (40Hz-500Hz)
LPF: To adjust the low pass filter’s crossover point (40Hz-500Hz)
Gain: Input signal level adjustment 0.2V-6V
3| Bass Boost| To adjust the Bass from min to max
4| Remote| Input for the connection of the remote level control
s| Power status, clipping, protection LED| Indicating power and clipping status and activated protection mode
6| Speaker Output| To be connected to one or more speakers

Operation

Status LEDs (Power and Protect): Power LED will illuminate blue when the amplifier is turned on and operating normally. The clipping LED will illuminate yellow when experiencing any clipping issues. Protection LED will illuminate if the amplifier shuts down due to a short circuit, DC offset, or overheating.

Remote Level Control: Input adaptor for connecting a remote bass control knob.
(Remote control knob included)
HPF Variable Control: This is a separate low-frequency filter that can be adjusted
anywhere from 40Hz – 50GHz. This control function is useful for removing low bass frequencies to prevent damage to the small full-range speakers.
LPF Variable Control: The variable crossover control on the side panel of the amplifier allows you to adjust the crossover frequency from 40-500Hz. We recommend starting at the midpoint setting (8GHz) and turn clockwise for greater mid-bass frequencies or counterclockwise for reduced mid-bass output.
Level Control: The input gain control is not a volume control. It is possible to have a maximum power output even at the minimum level setting. To set this level properly turn the source unit to 80% volume. Next, slowly turn clockwise the level control on the amplifier up until you can hear audible distortion, then turn it down to preferred settings.
Line Level Inputs: The RCA inputs are capable of receiving low-level signals (200mV-6V) from a source unit, preamplifier, or equalizer.
GND (Ground): Connect this terminal directly to the metal chassis of the vehicle.
REM (Remote Turn): This terminal is used to turn on the amplifier when the stereo head unit is turned on. Connect it to the remote turn-on lead output of your stereo head unit.
+12V Power: Connect this terminal directly to the battery. Protect the power wire by installing a fuse or circuit breaker of the appropriate size. Speaker Output: Connect your loudspeakers to this terminal.

Troubleshooting

If your amplifier does not appear to be working, check the obvious things first, such as blown fuses, poor or incorrect wiring, setting of the crossovers, source unit, gain setting, etc. There is a power LED indicator on the side of the amplifier denoting the power state of the amplifier in addition to the protection LED. Green status is working and Red signifies the amplifier is in protect mode.

Power LED not illuminated? With a multimeter check the following: 1) + 12 volt power terminal should read between + 12V to 16V. 2) Remote turn-on terminal should read the same as+ 12 volt. 3) Check for reversed power and ground connections. 4) Ground terminal for proper conductivity. 5) Check for blown fuses.

Power LED illuminated, no output? Check the following connections: 1) RCA connections. 2) Test speaker outputs with a known operating speaker. 3) Substitute stereo sound source with a known operating source unit. 4) Check for a signal in the RCA cable, if needed run a new cable on the outside of the vehicle.

Protection LED illuminated red?

1. If the amplifier is very hot to the touch and thermal protection is engaged. Test for proper impedance at the speaker terminals with a multimeter. Check for adequate airflow around the amplifier.
2. If the amplifier shuts down while the vehicle is running, the voltage protection is engaged and voltage to the amplifier is not within the 10-16-volt operating range. Have the vehicle’s charging and electrical system inspected?
3. If the amplifier will only play at low volume levels, the short circuit protection is engaged. Check for speaker wires shorted to each other or the vehicle chassis. Check for damaged speaker(s) operating below the minimum recommended impedance.

Alternator/generator noise-whining sound with engine’s RPM?

1. Check for damaged RCA cables.
2. Check the routing of the RCA cables (do not run signal and power cables parallel to each other.
3. Check the source unit for proper grounding.
4. Check the gain settings and turn them down if they are set too high.

Ground noise? NVX Audio amplifiers are engineered to be fully compatible with all manufacturer’s stereo head units. Some head units may require additional grounding to prevent noise from entering the audio signal. If you are experiencing this problem with your head unit,  inmost cases running a ground wire from the RCA outputs on the head unit to the chassis will remedy this issue.

Reduced bass response? Reverse a speaker connection from positive to negative on the subwoofer terminals, if the bass improves, the speaker was out of phase. CAUTION : When jump-starting the vehicle, be sure that connections made with
jumper cables are correct. Improper connections can result in blown amplifier fuses as well as the failure of other critical systems in the vehicle.

CONSUMER LIMITED WARRANTY INFORMATION

NVX Audio offers a limited warranty on NVX Audio products on the following terms:

Length of Warranty (U.S.A.)

• Standard Warranty – 1 Year

Length of Warranty (World Wide)
Warranties vary by country. Please contact your local Authorized NVX Audio Distributor for further terms & conditions.

What is Covered?
This warranty applies only to NVX Audio products sold to consumers by Authorized NVX Audio. Dealers in the United States of America or its possessions. Product purchased by consumers from an Authorized NVX Audio Dealer in another country are covered only by that country’s distributor and not by NVX Audio.

Who is Covered?
This warranty covers only the original purchaser of NVX Audio products purchased from an Authorized NVX Audio Dealer in the United States. To receive service, the purchaser must provide NVX Audio with a copy of the receipt stating the customer name, dealer name, product purchased, and date of purchase.

Products found to be defective during the warranty period will be repaired or replaced (with a product deemed to be equivalent) at NVX Audio’s discretion.

What is Not Covered?
Damage caused by accident, abuse, improper operations, water, theft, shipping. Any cost or expense related to the removal or reinstallation of the product. Service performed by anyone other than NVX Audio or an Authorized NVX Audio Service Center. Reduced bass response? Reverse a speaker connection from positive to negative on the subwoofer terminals, if the bass improves, the speaker was out of phase.

CAUTION : When jump-starting the vehicle, be sure that connections made with jumper cables are correct. Improper connections can result in blown amplifier fuses as well as the failure of other critical systems in the vehicle.

California Proposition 65 Warning
For more information, visit: www.P65Warnings.ca.gov

WARNING : This product contains chemicals, including lead or lead compounds, that are known to the State of California to cause cancer, and birth defects or other reproductive harm.

References

• P65Warnings.ca.gov

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