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Beginner - Amp/Mic Advice Needed (aussie.zone)

submitted 1 year ago by [email protected] to c/[email protected]

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Hi There! I am a beginner to amplifiers and I purchased an Aroma AG-15a for busking, which has separate guitar and mic inputs. I purchased a dynamic stage mic (Behringer BA 85a) and an XLR to 1/4inch stereo TRS cord, but there is no sound when plugged in, even with both volume knobs on the amp turn up to full. I tested the dynamic mic on a different guitar amp (no mic input) and it worked, so the mic is not faulty.

I rigged up a connection to the problem amp with a battery powered Zoom H1N recording mic, and it worked, but this is obviously not the mic I want to use for performing. Everything I read says a dynamic mic is plug and play in this situation. I am finding it impossible to find information anywhere about whether there is something wrong with the amp, if I need a different mic, or I'm doing something else wrong.

So having watched a few videos, I discover that I might need a Mic Impedance Transformer to get 'power'/volume to the dynamic mic. Is a Mic Impedance Transformer a type of Mic Pre-amp?

Should I buy a Mic Impedance Transformer or a Mic Pre-amp??

P.S. I made a connection via a Hum Eliminator, and actually heard the mic thru the amp for the first time, but it is still very soft.

How do I solve my problem?

PLEASE HELP!! I'm tearing my hair out!

Thanks in advance for your expertise in this.

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[–] [email protected] 3 points 1 year ago (3 children)

Definitely something going on that doesn't make sense here - input impedance of the mic input for that amp appears to be 1k, with the mic at 300ohm. Yes it's mismatched, but not enough to cause zero signal.

I'm guessing cable - can you borrow a standard xlr and try an adaptor, or get another xlrl to 1/4”?

[–] [email protected] 2 points 1 year ago (1 children)

Thank you for the advice and for pointing out the input impedance of both the mic and mic input on the amp .... I have better understanding of that now. Your guess was correct in that it was the cable ... a standard XLR to TS jack did the trick! 😊

[–] [email protected] 2 points 1 year ago

Fantastic news, glad you got it sorted

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