ESX Quantum QE80.8DSP, Owner'S Manual

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TROUBLE SHOOTING

ELECTRICAL INTERFERENCES

The reason for interferences are mostly the routed cables and wires. Especially the power and audio cables (RCA) of your sound system 

are vulnerable. Often these interferences are caused by electric generators or other electrical units (fuel pump, AC etc.) of the car. The 

most of these problems can be prevented by a correct and careful wiring.

Here are some courtesy notes:

1.   Use only double or triple shielded audio RCA cables for the connection between the amplifier and head unit. An useful alternative 

  are represented by anti-noise-devices or additional ancillary equipment like Balanced Line Transmitters, which you can purchase 

  at your car audio retailer. If possible do not use anti-noise-filters, which are splicing the ground of the RCA audio cables.      

2.  Do not lead the audio cables between the head unit and the amplifier together with the power supply wires on the same side of 

  the vehicle. The best is a real separated installation on the left and right cable channel of the vehicle. Then the overlapping 

  of interferences on the audio signal will be avoided. This stands also for the enclosed bass-remote wire, which should not be installed 

  together with the power supply wires.

3.   Avoid ground loops by connecting all ground connections in a starlike arrangement. The suitable ground center point is 

  ascertainable by measuring the voltage directly on the vehicle’s battery by a multi-meter. You should measure the voltage with 

  turned-on ignition (acc.) and with other turned-on power consumers (e.g. headlights, rear window defroster, etc,). Compare 

  the measured value with the voltage of the ground point you have choosen for the installation and the positive pole (+12V) of 

  the amplifier. If the voltage has just a little difference, you have found a suitable ground point. Otherwise you need to choose an

  other ground point.      

4.   Use if possible only cables with added or soldered cable sockets or the like. Gold plated or high value nickel plated cable sockets 

  are corrosion free and own a very low contact resistance. 

PROTECTION CIRCUIT

This amplifier owns a 3-way protection circuit. On overloading, overheating, shorted loudspeakers, too low impedance or insufficient 

power supply, the protection circuit turns off the amplifier to prevent serious damage. If one of this dysfunctions is detected, the red 

PROTECT LED lights up. 

In this case, check all connections to detect short-circuits, faulty connections or overheating. Refer to the notes on the next page.

If the reason for the dysfunction is eliminated, the amplifier is ready for operation again. 

If the red PROTECT LED does not stop to light up, the amplifier is damaged. In this case return the amplifier to your car audio retailer 

with a detailed malfunction description and a copy of the proof of purchase.

WARNING:

 Never open the amplifier and try to repair it by yourself. This causes a loss of warranty. The repairing service should be made 

only by skilled technicians.

INSTALLATION AND OPERATION IN NEWER VEHICLES!

In vehicles with a newer year of manufacturing (since approx. 2002), normally computer controlled diagnosis- and controlling systems are 

applied - like CAN-BUS or MOST-BUS interfaces. With the installation of a car audio amplifier a new appliance will be added to the 12V 

on-board electrical system, which may cause under several circumstances error messages or may interrupt the factory made diagnosis 

system, as a result of high stress peaks and a higher power consumption. Thus, depending on model and manufacturer, the driving safety 

or important security systems like air bags, ESC or others could be interrupted.       

If you plan to operate the amplifier in a vehicle like described above, please follow these instructions: 

•  Let the installation be made only by a skilled specialist or a service station, which is specialized for the maintenance of your vehicle.

•  After the installation, we suggest to make a computer diagnosis of the on-board system, to detect possible malfunctions or errors.

•  If the on-board system is interfered by the installation of the amplifier, an additionally installed power capacitor can stabilize the electrical 

  on-board system to ensure a proper and stable operation.

•  The best solution is the integration of an own additional 12 V electrical system for the sound system, which can be operated 

  independently with an own battery supply.  

CONSULT YOUR CAR SPECIALIZED SERVICE STATION!