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  • January 9, 2011 at 9:59 pm in reply to: 22 Caliber #113599
    fmalitz
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    Quote:
    I just purchased a Caliber 22 power amp.
    I have a guitar USB interface what is connected to my laptops USB port and I am using a software to play with various effects.
    When I plug the instrument cable into the Calibre 22 input coming from the output of the USB guitar interface the Caliber 22 cuts out immediately. If I plug the guitar straight into the Caliber input it works fine, but on bigger volume it cuts out. I am using a 100watt 8 ohm speaker cabinet.
    Could anybody advise me what could be the solution to connect the USB interface to the power amp? I have two USB guitar interfaces and the same thing happens with both of them, when I connect them to the power amp immediately cuts the sound off. I was trying to put the volume down to zero on both interfaces, but the same thing happens every time the Calibre 22 cuts out.
    I suppose it has some kind of overload protection but I can not imagine that the outgoing signal wold be so huge from the USB interface.
    I do not want to play with it because I might stuff it up.
    Any help would be appreciated.

    I suppose, being new myself, that no one has replied because you’re probably supposed to be in the “help” topics but I’ll try. I was confused by strovachek’s question. When you wrote that you plugged an instrument cable into the 22’s input, are you sure it’s the input and not the output? Furthermore, if it’s a USB interface, does it have a line-level out or mic (guitar) level out? Assuming it has a 1/4″ out at all, if it’s putting out line level, it could overload the pre-amp (input) stage of the 22. The input stage is designed for high-impedance, low-level guitar signal right from your pickups.

    Also, it’s true that the fact that the amp shuts down when you play through it without the USB interface indicates it’s either defective, the speaker has a partial short in the voice coil, your speaker cable connector is not all the way in, in either end or you’re playing incredibly loud!
    Good luck. If you can provide more detail, someone may be able to help.
    Frank

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