Trouble Shooting

The key to finding the problem in a misbehaving sound system is to isolate parts of that system in a logical fashion to track down the fault.

Description of the Diagnostic system built into all MB Quart amplifiers

The diagnostic system will shut down the amplifier, until reset by turning the head unit off, and back on. This state of affairs will be indicated by the front panel PROTECT LED lighting up under the following conditions:

1 - A short circuit on the loudspeaker leads.

2 - An internal amplifier fault that causes a DC offset on the loudspeaker output.

Should the amplifier go into diagnostic mode, simply disconnect all RCA and speaker leads, while keeping +12 volt, power ground and remote leads connected.

1.Now turn the amplifier back on, and if the diagnostic LED lights, the amplifier has an internal fault.

2.If not, plug the RCA cables back, and reset the amplifier. If it goes into diagnostic now, the fault lies in the input, either with bad cables or source unit.

3.If the amplifier seems fine with RCA cables plugged in, connect the speakers, one at a time, and if one of the speakers or its wiring is faulty, it will activate the diagnostic system.

Amplifier heatsink overheating

The amplifiers will shut down when the heatsink temperature reaches 80 degrees centigrade, and turn back on once the unit has cooled down below that point. Causes of overheating:

1 - Inadequate cooling - relocate or remount to provide better natural airflow over the fins.

2 - Driving high power levels into low impedances - back off on the volume control, and/or make sure you are not loading the amplifier with less than the recommended loudspeaker impedance.

Low output power

1 - Check that level controls have been set up properly.

2 - Make sure that the battery voltage, as measured at the amplifier’s +12 volt and ground terminals, is 11 volts or more. 3 - Check all +12 volt and ground connections.

Fuses blowing

1 - The use of loudspeaker impedances below the recommended minimums will draw more current - check. 2 - A short on the main +12 volt cable from the battery to the vehicle chassis will cause the main fuse to blow.

System does not turn on 1 - Check all fuses.

2 - Check all connections.

3 - Measure the +12 volt and remote turn on voltages at the amplifier terminals. If these are non existent or low, take voltage measurements at fuse holders, distribution blocks, the head unit’s +12 volt and remote leads to localize the problem.

Noise problems

System noise can be divided into two categories, hiss, and electrical interference.

Hiss, or white noise

1 - High levels of white noise usually occurs when amplifier level controls are turned up too high - readjust according to the procedures in section ”Setting up systems after installation for best performance”

2 - Another major problem that can cause excessive hiss, is a noisy head unit - unplug the amplifier input RCA cables, and if the hiss level reduces, the source unit is at fault.

Electrical interference

The inside of an automobile is a very hostile electrical environment. The multitude of electrical systems, such as the ignition system, alternator, fuel pumps, air conditioners, to mention just a few, create radiated electrical fields, as well as noise on the +12 volt supply and ground. Remember to isolate the problem - first unplug amplifier input RCA cables, if the noise is still present, check the speaker leads, if not, plug the RCA’s back, and investigate the source driving the amplifier, one component at a time.

A ticking or whine that changes with engine RPM:

1 - This problem could be caused by radiation pickup of RCA cables too near to a fuel pump or a distributor, for instance, - relocate cables.

2 - Check that the head unit ground is connected straight to the vehicle chassis, and does not use factory wiring for ground.

3 - Try to supply the head unit with a clean +12 volt supply directly from the battery +, instead of using a supply from the in dash wiring/fusebox.

A constant whine:

This type of noise can be more difficult to pinpoint, but is usually caused by some kind of instability, causing oscillations in the system. 1 - Check all connections, especially for good grounds.

2 - Make sure that no speaker leads are shorting to exposed metal on the vehicle chassis.

3 -RCA cables are notorious for their problematic nature, so check that these are good, in particular the shield connections.

FX1.1000 specifications

The MB QUART FX1.1000 is a powerful and versatile car amplifier designed to deliver high-quality sound in automotive audio systems. Renowned for its performance and reliability, this amplifier boasts several advanced features and technologies that make it a popular choice among car audio enthusiasts.

One of the standout features of the FX1.1000 is its impressive power output. With a peak power rating of 1000 watts, it can effortlessly drive subwoofers and speakers, providing a robust audio experience that enhances any drive. The amplifier is capable of operating in both 2-ohm and 4-ohm configurations, allowing flexibility when pairing it with various audio setups.

The FX1.1000 is engineered with Class D technology, which ensures efficient power management and minimizes heat generation. This design not only allows for a smaller footprint but also optimizes battery life, making it an excellent choice for those who prioritize efficiency without sacrificing sound quality. Class D amplifiers are known for producing clean power, and the FX1.1000 is no exception, offering low distortion levels that keep audio signals crystal clear at any volume.

Additionally, this amplifier features adjustable crossovers, enabling users to tailor the frequency response to their specific audio system. The low-pass crossover is particularly beneficial for driving subwoofers, allowing for a better blend with full-range speakers. The gain control further enhances customizability, giving users the ability to fine-tune the output level to achieve their desired sound profile.

Durability is another essential aspect of the MB QUART FX1.1000. The amplifier is built with a robust, heat-sink design that aids in cooling, ensuring consistent performance even during extended use. Its well-constructed chassis provides protection against vibration and impacts commonly encountered in automotive environments.

Furthermore, installation is simplified with a user-friendly layout and clear input/output connections. The amp can easily integrate into most existing car audio systems, making upgrades straightforward for both novice and experienced installers.

In summary, the MB QUART FX1.1000 is a dynamic high-performance car amplifier that blends power, efficiency, and versatility. With features such as Class D technology, adjustable crossovers, and a durable design, it stands out in the competitive automotive audio market, making it a worthy investment for anyone seeking to elevate their in-car sound experience. Whether for casual listening or high-energy tunes, the FX1.1000 delivers exceptional audio quality tailored to individual preferences.