AUDIO GROUND CHASSIS/FLOAT SWITCH

In general, the Audio Ground of each amplifier should be connected to AC mains earth ground AT ONE POINT ONLY- either through the Chassis (by selecting the "Chassis" position) OR through the input cable (with the switch in the "Float" position, and pin 1 of the XLR or the sleeve of the 1/4" connected to the ground of the signal source unit.)

The Chassis/Float switch can be used as a means to troubleshoot ground loop problems, or to verify wiring. Ground loops are characterized by a hum or buzz through the speakers, and occur when multiple paths exist for a given ground circuit. This switch allows the Audio Ground to be temporarily "lifted" or "floated" from the chassis, so continuity tests can be made to verify or reverse-engineer a grounding system. The following information will be useful when planning or troubleshoot- ing system wiring:

•The chassis is permanently conected to the earth (safety) ground pin of the Mains power connector.

•The Audio Ground of each GX2800 is permanently connected to the black terminals of both output binding posts, to pin 1 of each XLR input, and to the sleeve of each 1/4" input.

•The XLR shell is permanently connected to chassis.

•With the Chassis/Float switch in the "Chassis" position, the Audio Ground will be connected to the Chassis and AC mains earth ground. This connection is made through a 0Ω resistor (R350) located on the input board. The resistor serves as a

fuselink in the case of severe system faults. To check this resistor, remove all connectors from the amplifier and discon- nect the AC main plug. With the switch in the "Chassis" position, use an ohmmeter to measure the 0Ω resistance between the earth ground pin of the AC mains plug and Audio Ground at either black terminal of the output binding posts.

•By selecting the “Float” position, the Audio Ground is not directly connected to the chassis, and can be referenced to

some other ground through the input cable or speaker ground. For safety reasons, a 0.1uF capacitor (C125) permanently connects Audio Ground to chassis at RF frequencies, but only presents 27kΩ of impedance at 60Hz.

!OUTPUT

The speaker output connectors are dual binding posts which will accept wire up to 12 AWG, or spade connectors. They are spaced on 3/4" centers for use with dual banana plugs. The positive output red terminals are oriented such that a dual banana plug can be used for bridged mono operation.

POWER SWITCH

The power switch is located on the front of the amplifier. Two green "Power" LEDs indicate that the corresponding amplifier channel is turned on. Standard practice is to turn the amplifier on last, and off first when powering your system on and off. This insures that any turn on/off glitches in source components or signal processing equipment will occur before the ampli- fier is turned on, or after it is turned off. It is possible to leave the power switch on at all times and switch the amplifier remotely with a breaker switch or other AC power switch. When doing so make sure the switch is rated for the current required by the amplifier.

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Hafler GX2800CE manual Audio Ground CHASSIS/FLOAT Switch, Output, Power Switch
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GX2800, GX2800CE specifications

The Hafler GX2800CE and GX2800 are high-performance power amplifiers designed for audiophiles and professional sound reinforcement applications. Renowned for their reliability and audio fidelity, these models represent a seamless combination of innovative technologies and robust engineering that ensures impeccable sound quality.

One of the standout features of the Hafler GX2800 series is their high current output capability. This allows the amplifiers to drive a wide variety of loudspeakers, including those with demanding impedance requirements. With a power output of 280 watts per channel at 4 ohms, these amplifiers deliver sufficient power for large venues while maintaining clarity and dynamic range. The ability to handle low impedance loads without compromising performance is a hallmark of the Hafler brand.

The GX2800CE and GX2800 are equipped with Hafler's proprietary feedback technology, reducing distortion and enhancing overall sound quality. This technology ensures that the amplifiers perform well across the audio spectrum, allowing for rich, detailed sound reproduction. The low total harmonic distortion (THD) figures also contribute to a cleaner audio signal, ensuring that the listener experiences music as it was intended.

Another notable characteristic of the GX2800 series is its built-in protection circuitry. This includes short-circuit protection, thermal overload protection, and output DC protection, which work together to safeguard the amplifier and connected speakers during operation. The durable design of the chassis provides further reliability, suitable for both studio environments and live sound applications.

The amplifiers feature balanced XLR and unbalanced RCA inputs, providing versatility for various audio setups. Additionally, the rear panel includes binding post speaker outputs for secure connections to loudspeakers.

For those seeking a powerful and reliable amplifier that does not compromise on audio quality, the Hafler GX2800CE and GX2800 are exceptional choices. With their array of features designed to enhance performance and user experience, these amplifiers stand out in the competitive audio equipment market, making them ideal for both home and professional uses. Whether you are mixing in the studio or providing sound for a live performance, the Hafler GX2800CE and GX2800 will deliver exceptional results, making them a worthy investment for any audio enthusiast.
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