®

Troubleshooting

Owner’s Reference GCA Power Amplifier Series

No sound comes out of the amp

If no sound comes out of the GCA Series Power Amplifi er there are several areas to check. Either you are not getting an audio signal into the Series Power Amplifi er, you are not properly connected to the loudspeakers so the audio can get out of the Series Power Amplifi er, there is no power from the AC socket, or you have the DC trigger jack connected without an appropriate voltage to turn it on.

Check the input

Check the rear input selector first

It is obviously important that the GCA Series Power Amplifi er receive a high level signal from the preamplifi er, surround processor or whatever source you are feeding it. One way to determine if this is the case, would be to fi rst go to your loudspeaker. Place your ear very near the tweeter and listen for a very slight hiss. If you hear one, chances are good the amp is working fi ne, connected properly at the speakers and you have an input problem. If you suspect an input problem, the fi rst thing to check is the rear panel switch. The switch on the rear of the GCA Series Power Amplifi er is an input selector. With a source connected to the preamp and the preamp volume turned up, click the rear mounted input selector on the GCA Series Power Amplifi er to both positions and see if this solves the problem.

Try another source

If not, place the switch to the proper position and replace the interconnects between the preamp and power amp. At last resort, if you suspect an input problem, try another preamp, or plug the output of your CD player or DVD player directly into the GCA Series Power Amplifi er. Be careful to choose a CD or DVD with relatively soft music because this will play very loudly.

If you suspect an output problem

If there is a lot of hiss in your speaker

If you suspect an output problem, use the same technique of placing your ear very close to the speaker’s tweeter while the GCA Series Power Amplifi er is turned on. You should hear a very slight amount of hiss from the tweeter. If you do not, check the speaker cable/amp connection. Make sure the amp’s front panel light is on, indicating proper performance.

If there is no sound and you are convinced the GCA Series Power Amplifi er has power and its front panel light is lit, contact your dealer, distributor or PS Audio for further assistance.

If there is an excessive amount of hiss or noise from the loudspeaker, it is probably not from the GCA Series Power Amplifi er as this amp has extremely low self noise. Turn the amp off, remove the interconnect cables from the GCA Series Power Amplifi er and then turn the amplifi er back on. Listen once again to see if the noise has been diminished. If it has, chances are good you either need to replace your preamplifi er with a quieter one or you may need to experiment with better shielded interconnect cables.

If you have hum or buzz

If you experience a hum through the speakers this can be caused by several things. The fi rst is the source. If there is an excessive amount of buzz or noise from the loudspeaker, it may be caused by a ground loop, a light dimmer in the home, poor AC power, or any number of causes. The quickest way to determine where to start your search is to simply turn the amp off, disconnect the cables feeding its input, and see if the hum goes away when you turn it back on. If it does, it’s most likely a ground loop or buzz from a dimmer.

The easiest way to fi gure out where ground loop problems lie is by the process of elimination. You

4826 Sterling Drive, Boulder, CO 80301

Troubleshooting 6

PH: 720.406.8946 service@psaudio.com www.psaudio.com

 

©2004 PS Audio International Inc. All rights reserved.

Page 9 Page 11
Page 10
Image 10
PS Audio GCA-250, GCA-500, GCA-100 manual Troubleshooting
Page 9 Page 11

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.
Top Page Image Contents