PS Audio GCA-100, GCA-500, GCA-250 manual Finding a ground loop Try a cheater plug

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®

Troubleshooting

Owner’s Reference GCA Power Amplifier Series

Finding a ground loop

Try a cheater plug

need to determine where the hum or buzz is coming from within your system.

If the hum/buzz goes away when you remove the inputs to the power amp, your next step will be to reconnect the amp and move further down the chain. If you were working with a receiver or an integrated amplifi er, you will need to jump to step 4. If you have a preamp, or processor that is feeding the power amp, your next step would be to disconnect all inputs to the preamplifi er or processor. Once these are disconnected, and the preamp or processor is connected only to the power amplifi er, turn the system on and again, listen for hum. Should the hum now appear, it is a problem with your preamp or processor or their interaction with the power amp. Before returning the preamp or processor to the manufacturer, try a cheater plug to break a ground loop. Cheater plugs are simple devices that convert a three prong AC plug into a two prong AC plug and in the act of converting three prongs, to two prongs, they disconnect the ground from the wall socket. Try one of these on the preamp, or the power amp, or both.

Process of elimination

It could be the cable TV

Blue light is too bright

Problems with subwoofers

If you determine that there is still no hum present when the preamp, processor or receiver is connected with no inputs, then selectively begin plugging in your various inputs one at a time. After each connection, check for hum until you discover the humming culprit.

VCR’s, surround processors, and any device that is connected to a television cable or satellite dish can cause a loud buzz and should always be suspect. If, by the process of elimination described above, you determine it is a component like a VCR that is causing the hum/buzz to occur, and using a cheater plug or removing the ground pin on a PS xStream Power Cable doesn’t help matters, it may be necessary to isolate the cable connection (CATV) with an isolation transformer. This inexpensive device is available at most Wal Mart, Radio Shack or department store type outlets and is sometimes called a ‘matching transformer’. If you have problems fi nding one, call your local cable TV company for advice. The matching transformer will be placed between the cable TV cord and the VCR, TV or processor.

Just remember, take the system down to its simplest level of connection. Find a way to hook the system up with as many pieces of the system missing or not connected. Keep it simple and get it to the point where the hum’s gone. Then start adding back components one at a time until the hum returns.

Finding the problem is 9/10th of the work in fi nding a solution.

If the blue light is too bright, or if it is not lit but the amplifi er plays, check the rear panel of the GCC Series Power Amplifi er for the three position dimmer switch. The switch is located on the rear panel, upper left hand side as you face the rear of the unit.

If you have a problem connecting a subwoofer, please refer to the quick start guide in the front of this manual. We do not recommend connecting the high level inputs of a self power subwoofer to the outputs of the GCC Series Power Amplifi er. For many subwoofers it will be fi ne. Some, like the REL subwoofers, and the Carver, Sunfi re type of subwoofers will not work properly when connected to the GCC Series Power Amplifi er’s outputs. This is because the GCC Series Power Amplifi er is a balanced type of output with a DC voltage as referenced to ground.

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Troubleshooting 7

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Contents Introduction Owner’s ReferenceDocument Introduction Important Safety InstructionsTable Of Contents What you can expect Cool and efficient running Power ratingsThank you Three modelsGetting Started Isolation Power Cables ConditionersGetting Started LocationQuick Start Guide Quick Start GuidePush the front panel logo to turn it on Check for porper polarityIsolation? Front panel blue light Placement?Front panel power button Questions and AnswersWhat voltages can the amp run on? Troubleshooting Finding a ground loop Try a cheater plug If the amp shuts down while playing music Conditions Remedy Miscellaneous WarrantyWarranty Outside the US WarrantyService ServiceService

GCA-100, GCA-250, GCA-500 specifications

PS Audio has long been recognized as a leader in high-fidelity audio equipment, and their line of power amplifiers, specifically the GCA-250, GCA-500, and GCA-100, showcases the company’s commitment to quality sound reproduction and cutting-edge technology. Each model in this series is designed to deliver exceptional performance, making them suitable for both audiophiles and casual listeners alike.

The GCA-250 is known for its impressive power output, delivering 250 watts per channel into 8 ohms. This power allows it to drive a variety of speakers effortlessly, providing dynamic sound with precision and clarity. One of the standout features of the GCA-250 is its Class AB amplifier design, which combines the best characteristics of both Class A and Class B amplification. This results in low distortion levels and high efficiency, enabling the amplifier to produce warm and rich audio without excessive heat generation.

Moving up the line, the GCA-500 takes performance to another level with its 500 watts per channel output into 8 ohms. This amplifier is built to handle more demanding speaker loads, making it ideal for larger systems or for those who prefer a more powerful sound experience. It incorporates advanced feedback control technologies that help minimize signal degradation, ensuring that the audio remains pure and detailed even at higher volumes. The GCA-500 also features a balanced input option, enhancing connectivity and reducing noise interference for a cleaner sound.

At the entry level, the GCA-100 offers a commendable 100 watts per channel into 8 ohms. Despite being the most compact model, it still embodies PS Audio’s high standards of construction and sound quality. The GCA-100 is perfect for smaller listening spaces or as part of a multi-room audio setup. It maintains a robust build quality and utilizes a simplified design to focus on delivering a straightforward yet enjoyable listening experience.

All three models share key characteristics such as their robust chassis construction, which helps minimize vibrations and interference, and their ultra-silent operation thanks to premium components and design considerations. They also offer seamless integration with other PS Audio products, making them versatile components in a complete audio system.

In summary, the PS Audio GCA series of amplifiers—GCA-250, GCA-500, and GCA-100—combine innovative technologies, high-quality materials, and powerful performance to cater to diverse audiophile needs. Whether for casual listening or serious audio pursuits, these amplifiers stand out as durable and high-performing choices that bring music to life with stunning fidelity.
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