Gemini's XGA series of audio amplifiers is a robust and adaptable set of amplifiers suitable for diverse audio applications. This guide will delve into a comprehensive explanation of how to install and resolve any issues with your XGA amplifier, touching on subjects like bridge modes, impedance matching, fuse replacements, and more.

 

ACTIVATING YOUR DEVICE

Locate the power switch on the left side of the XGA amplifier's front panel to switch on the device. Switch it to the "On" position, at which point the LED meters for each channel should illuminate, signifying that the amplifier is powered up.

 

SETTING THE LEVEL/GAIN

On the right side of the front panel, there are distinct level/gain knobs for CH 1 and CH 2. These dials manage the input level for each channel. Adjust them to establish the desired input level for both channels.

 

UNDERSTANDING THE LED METERS

The XGA amplifier's front panel features LED (Light Emitting Diodes) meters which display critical information regarding the amplifier's status. The “Protect” red LED shows when the amplifier has entered protection mode to prevent damage, while the yellow “Clip” LED indicates when the input signal is too intense and causing distortion. The green “Signal” LED confirms that the amplifier is receiving audio input, while the blue bridge LEDs signify when the amplifier is operating in bridge mode.

 

STEREO INPUTS

The XGA amplifier comes with stereo inputs, labeled CH 2 and CH 1, on the rear panel. Each channel has one female XLR and a 1/4" input. Choose the fitting input for your audio source.

 

USING THE GROUND LIFT SWITCH

In case you encounter ground loop hum or other noise complications, the ground lift switch on the amplifier's back panel can be utilized to eliminate the noise.

 

SELECTING STEREO/BRIDGE MODE

The XGA amplifier can operate in either stereo mode or bridge mode. The switch for these modes is located on the amplifier's back panel. In stereo mode, the amplifier delivers separate output for each channel. In bridge mode, the amplifier merges the output of both channels to deliver a single, more potent output.

 

SPEAKON OUTPUTS

The XGA amplifier features three Speakon connectors labeled "CHANNEL 2," "BRIDGE," and "CHANNEL 1." For stereo mode, connect two Speakon cables to "CHANNEL 2" and "CHANNEL 1." For bridge mode, connect a single Speakon cable to the "BRIDGE" output connector.

 

BANANA PLUG CONNECTORS

Located below the Speakon connections on the amplifier's back panel, you'll find banana plug connectors. For "CHANNEL 2" use the black and red connectors, and for "CHANNEL 1" use the red and black connectors. For bridge mode, connect a banana plug speaker cable to the two center red terminals (one from each channel).

 

IMPEDANCE MATCHING

Ensure your speakers' impedance matches the amplifier's rating for optimum performance and equipment safety. The XGA Series amplifiers have a minimum impedance rating of 4 ohms in stereo mode and 8 ohms in bridge mode. Confirm the impedance rating of your speakers matches that of the amplifier when making connections.

 

The XGA amplifier's power specifications are as follows:

• XGA-2000
  • 2x 125W RMS at 4 Ohms Stereo
  • 2x 90W RMS at 8 Ohms Stereo
  • 250W RMS at 8 Ohms Bridged
• XGA-3000
  • 2x 200W RMS at 4 Ohms Stereo
  • 2x 150W RMS at 8 Ohms Stereo
  • 400W RMS at 8 Ohms Bridged
• XGA-4000
  • 2x 350W RMS at 4 Ohms Stereo
  • 2x 250W RMS at 8 Ohms Stereo
  • 700W RMS at 8 Ohms Bridged
• XGA-5000
  • 2x 550W RMS at 4 Ohms Stereo
  • 2x 400W RMS at 8 Ohms Stereo
  • 1100W RMS at 8 Ohms Bridged

CHANGING FUSES

If the amplifier's fuse blows, it must be replaced before the device can be operated again. The following steps will guide you through this process:

• Ensure the amplifier is disconnected and powered off.
• Locate the IEC power connector on the back of the amplifier and extract the fuse holder by rotating it counterclockwise.
• Remove the faulty fuse and substitute it with a new one of the same rating. The XGA Series amplifiers use a T6.3A/250V fuse.
• Reinsert the fuse holder by rotating it clockwise.
• Reconnect the amplifier and power it on to verify if it's functioning correctly.

 

TROUBLESHOOTING

In case of any issues with your XGA Series amplifier, adhere to these troubleshooting steps:

• Confirm that the power source is functioning and the amplifier is properly connected and activated.
• Verify that the input source cables are securely fastened, and the volume levels are appropriately adjusted.
• Ensure the impedance rating of your speakers corresponds to that of the amplifier.
• Check the LED meters on the front of the amplifier for any protection or clip LEDs. If a protection LED is illuminated, the amplifier might be overheating, or there could be a short circuit. If a clip LED is lit, the input signal might be too strong, causing distortion.
• Examine the fuse and replace it if required.

If these steps do not rectify the problem, contact Gemini customer support for further help.