PS Audio A-100 manual Finding a ground loop Try a cheater plug

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®

Troubleshooting

Owner’s Reference A-100 Power Amplifier

Finding a ground loop

Try a cheater plug

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

Problems with subwoofers

If the amp shuts down while playing music

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 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 A-100 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 A-100 Power Amplifi er’s outputs. This is because the A-100 is a balanced type of output with a DC voltage as referenced to ground.

If the A-100 shuts off when playing music, there are several possibilities. If the music plays quite loudly but shuts off on the most explosive parts of the music of video soundtrack, then the A-100 Amplifi er is probably underrated for the type of speaker you are using. See your dealer or call PS Audio for advice on going to the next size power amplifi er.

If the amplifi er shuts down with very little volume, then check the speaker cable connections. The

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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 Thank you Cool and efficient running Power ratingsGetting Started Isolation Power Cables ConditionersGetting Started LocationQuick Start Guide Check for porper polarity Are there any internal fuses? Placement?Questions and Answers Should the unit be on all the time?Protection circuitry Does the amp require ventilation? What voltages can the amp run on?Troubleshooting TroubleshootingFinding a ground loop Try a cheater plug Troubleshooting Remedy WarrantyWarranty ConditionsOutside the US Service ServiceYour purchase information Date of purchase If you have problems Voltage changes Your serial number

A-100 specifications

The PS Audio A-100 is a compact, high-performance Class D amplifier that delivers quality sound and efficiency in a sleek design. Part of PS Audio's mission to make high-quality sound accessible, this amplifier features innovative technologies and an array of characteristics that make it a noteworthy choice for audiophiles.

One of the primary features of the A-100 is its Class D architecture, which is known for its energy efficiency and thermal management. This design allows the amplifier to produce high power while maintaining a small footprint, making it an excellent choice for both small and large setups. With an output power of 100 watts per channel into 8 ohms, the A-100 can drive a variety of speakers with ease, delivering dynamic and robust sound reproduction.

The A-100 incorporates PS Audio's proprietary technologies, including the unique input stage and a custom-designed output stage. These technologies contribute to producing exceptional clarity and detail across all frequencies. The amplifier also features a low-noise power supply that minimizes interference, ensuring a clean and transparent audio signal. This is particularly beneficial for critical listening environments, where every nuance of sound matters.

Another important characteristic of the A-100 is its versatility. It includes various input options, such as RCA and XLR connectors, allowing seamless integration into different audio systems. This ensures compatibility with a wide range of source components, whether it be CD players, digital audio players, or home theater receivers.

The A-100 is also designed with ease of use in mind. It comes equipped with a simple, intuitive user interface that allows for straightforward operation. Moreover, its compact size means it can be easily placed in virtually any setup, from a dedicated audio room to a casual living space.

In addition to performance, PS Audio places great emphasis on build quality. The A-100 features a sturdy chassis that minimizes vibrations and interference, further ensuring high fidelity sound reproduction. Its modern aesthetic, combined with high-end materials, makes it an attractive addition to any audio setup.

In summary, the PS Audio A-100 amplifier is an excellent choice for those seeking high-quality sound in a compact form factor. With its advanced Class D technology, versatile connectivity options, and robust build quality, it stands out as a highly efficient and reliable amplifier in the modern audio landscape. Whether for casual listening or critical audiophile applications, the A-100 consistently delivers outstanding performance, making it a valuable asset for any audio enthusiast.
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