Protect, Load Switch, Thermal, Clipping, Signal

70V and 100V Mono mode also use the CH B input connector and level control only. The 70V or 100V speaker array load should be connected across the red terminals of the output connectors. Set both load switches to the appropriate 70V or 100V value. The rated power into the mono load will be double the rating for a stereo load. See diagram

PROTECT

The red "Protect" LED on the front panel indicates that the NOMAD protection circuit has been activated, and is limiting the output power of the amplifier. Typically this may only occur when a transient signal corresponds to a “dip” in the speak- ers’ impedance curve, and will not cause significant clipping distortion. However, if the nominal speaker impedance is sig- nificantly lower than the Load Switch setting, excessive clip distortion can result, accompanied by continuous or prolonged illumination of the protect LED. In this situation the Load Switch should be changed to a lower value until the “protect” events occur infrequently. See “Load Switch” paragraph.

LOAD SWITCH

The Load Switch-located on the front panel-allows the amplifier’s power supply to be matched to the speaker load for more efficient, cooler running operation. The power output and thermal performance of the amplifier remains consistent with all the possible combination of the loads listed. In Stereo or Biamp mode the Load switches can be configured independently, and each channel will deliver the same consistent output power and thermal performance, regardless of how the other channel is configured. Use the following guide when selecting the Load Switch setting:

Nominal Speaker Impedance	Load Switch Setting
5Ω-8Ωor higher	8Ω
3Ω-5Ω	4Ω
2Ω-3Ωor lower	2Ω

If the “Protect” LED is illuminated for prolonged periods during normal operation, select the next lower value Load Switch setting. Continue until the “Protect” LED ceases to illuminate, or lights infrequently. This switch can be safely operated while the amplifier is running. In 70V or 100V mode, the “Protect” LED indicates there are too many speakers loading the array.

THERMAL

Indicates when the thermal protection has shut down the amplifier. After cooling sufficiently, the amplifier will automatical- ly recover and continue operating.

CLIPPING

Lights up when the output or input signal reaches the maximum allowable voltage, and “clips” the output signal. To deter- mine whether the signal is clipping at the input or the output of the amplifier, perform this test: Turn the level control all the way “OFF.“ If the clipping continues then the signal is clipping at the amplifier input. Input clipping occurs at 3Vrms (sine), and can be eliminated by attenuating the signal before it reaches the amplifier. Output clipping can be eliminated by turn- ing down the amplifier level control. Since this circuit triggers off the internal error signal of the amplifier, it automatically adjusts for any combination of speaker impedance or Load Switch setting.

SIGNAL

Monitors the amplifier output and indicates when a signal of at least 1 Vrms is present. A number of situations could exist where the input cable is properly connected to the signal source, but the Signal LED does not illuminate, such as:

Level control is not high enough to amplify the output signal to 1 Vrms.

Source signal is off, or lower than normal.

Input cable is not connected to CH B while in Biamp, Mono, 70V or 100V mode.

Biamp or Mono switch is not selected when using a single input cable.

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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.