Ps-audio TRIO A-100 User Manual download pdf (Page 11)

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Troubleshooting 7

Troubleshooting

Owner’s Reference A-100 Power Ampliﬁ er

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.

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

Finding a ground

loop

Try a cheater plug

Process of

elimination

It could be the

cable TV

Problems with

subwoofers

If the amp shuts

down while

playing music

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Ps-audio TRIO A-100 User Manual Page 11

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