other geezer?

Perhaps you mean an extremely low microphone?

It still doesn't make sense. Geezer means an old person, is mildly pejorative, and is usually applied to men rather than women.

it was a peremptory pejorative prerogative, in short

game set and match?

A geezer is slang meaning old person, generally male. The context you indicated something about a low (?) microphone .... as a guess ... perhaps this means an old microphone, but frankly I've nver heard the expression used to refer to a thing ...only a male person.

Perhaps the low microphone was FOR the older man?

Thank you ALL for answering such a weird question.
(Sorry about the spelling mistake anyway.Yes,it's "low" .)

He seems to refer to the old microphone as a geezer, as Ragman says.

You're missing a point which Ragman made. The word geezer is used to refer to people, but not to things. If the intent of the author was to suggest that someone would refer to an old object, a thing, as a geezer, then i would say the author is not a native speaker of the English or the American language.

Sorry, but please reread what I wrote. An older male person is a geezer, never would anyone referring to the microphone.