Question about Gem Sound GemSound PA-585 2-Channel Amplifier

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Gem Sound xp-350 power amplifier.

Port lights come on almost immediately after power up with or without input source connected. Amp is being used to power small monitor speakers. Audio source is my laptop itunes library connected to a 12 channel Yamaha mixing board. Mixer sends signal from monitor out L/R to input jacks L/R on amp. Port lights shut down all audio when they come on right after power up. If I power off the amp and let it reset it will come on for a couple seconds, then port lights come on both channels and audio shuts down.

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  • Graeme Ross
    Graeme Ross May 11, 2010

    Hibjw1432

    hen you say "port" lights,are you referring to "prot" or protection lights? If you have protection lights engaging, there is a fault in either the amp or the speaker/wiring. If the problem is still there with the speakers and cables disconnected, then the fault is in the amp and will need a tech to take a look at it for you. If things seem normal with the speakers disconnected, then there is a fault in the speakers/connectors or wiring associated with them. You will need to do some checked with an ohms meter to look for short circuits, Happy to answer any questions you may have about this. Good Luck

    regards
    robotek


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Hi again, how did you go?

regards
robotek

Posted on Sep 06, 2008

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Audio connections should be matched.... its called Frequency impedance,.... to get a signal along wires or cables (or Fibre) the Impedance of the cables and wires must be matched to the device they are connected to transfer the signal along the cables without distortion...

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You have given me a good clue to your problem....

You say that the CD player goes well and does not shut the system down like the Live connections. This is a single input configuration...

This means that there is sound levels coming in from the live multiple connections that are too strong (Loud) for the amp to handle...
Its a good amp you have as its shutting down to protect itself instead of blowing up....
So.... set up for the live show then disconnect all but one of the live inputs and start the live session if its OK, then connect another of the live connections, and see if its OK, if it is then connect another live one connecting each one progressively until the problem occurs again...this last live connection is the one that is too loud in signal strength for the amp to handle causing the shut down...

Solution is to reduce tha signal on that last cable source to a level that stops the shut down...I remember that groups of guitar players have volume controls on each guitar and if these are set too high then this can occur....specially if they are all using the same amp without a controlled "mixer man" monitoring each input signal.
Rember the small meters on the mixing panel which have a green painted area and a red painted area the "mixer man" must keep the each meter needle in the green zone for all the inputs otherwise a shut down occurs.
Hope this helps you...

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