[Peter Larsen[_2_]]

wrote:

Hello,

I am looking for mic help!
I just bought a vintage Shure 55c high impedance microphone, a new
vintage style 7' cable (3-pin amphenol to 1/4"), and a 1/4" to XLR
transformer from radio shack. I have connected it to several
different sound boards but struggle to get good sound quality.
Everything sounds muffled, like the bass is missing perhaps.

High impedance .... high impedance ... high impedance ..... there could be a
message here.

Is it broken? Is it just old? Could I be wiring it wrong?

You need a suitable transformer or to try it in an instrument input.
Sennheiser made some cable trannies for this once upon a time .... there are
probably inline transformers that fit into an XLR barrel on the market
nowadays.

Adam


Kind regards

Peter Larsen