Accidentally connected my amp out into my PC soundcard in

SSCBA · #1 05-09-2011, 09:35 PM

That.. I was very tired and attemting to record some stuff and instead of connecting line out from the amp to mic input, I connected speaker out to my netbook mic input. Signal was stronger than normal but I didn't notice any harm to my computer or amp (GK MB200). I assume that resistance of the computer line in is too high for the amp to deliver too much current, but could there be any risk to worry about?

Thanks

seamonkey · #2 05-09-2011, 09:46 PM

You're right on the input impedance being high.
You probably got a lot of noise also, if not then the MB200 must be better than I'd expect.
Be glad it was a SS amp, no harm done.

SSCBA · #3 05-09-2011, 09:54 PM

Thanks,

I measured the mic input with a multimeter (I measured it as AC) and the multimeter showed 5V. Could that be harmful for the amp output?

PS: I didn't notice too much hiss when monitoring with Soundforge but I didn't listen the record, that was deleted accidentally. I don't know if it's related, but now when monitoring the bass sounds without treble in comparison to what gets recorded.

seamonkey · #4 05-09-2011, 10:16 PM

that 5v must just be noise. You shouldn't measure anything.

I didn't know you could monitor with soundforge?

There's Spectrum analyzers, or Real Time analyzer free programs that will let you test your sound card with a loop back cable. It's amazing how high of quality home recording is today with just a PC.

Here's one
http://www.trueaudio.com/rta_abt1.htm

fdeck · #5 05-09-2011, 10:20 PM

Quote:

Originally Posted by SSCBA

Thanks,

I measured the mic input with a multimeter (I measured it as AC) and the multimeter showed 5V. Could that be harmful for the amp output?

PS: I didn't notice too much hiss when monitoring with Soundforge but I didn't listen the record, that was deleted accidentally. I don't know if it's related, but now when monitoring the bass sounds without treble in comparison to what gets recorded.

The +5 V is intended to power an electret condenser microphone element. It's in series with a resistors of a few k Ohms.

For spectrum analysis, I use a program called Visual Analyzer, which is free.

SSCBA · #6 05-09-2011, 10:28 PM

Wow, thanks for your input guys! as useful as always

SurferJoe46 · #7 05-09-2011, 11:02 PM

And the smoke is all gone now? You got away with it then.