(Dick Pierce) wrote in message . com...
BOB URZ wrote in message ...
Dick Pierce wrote:

Wrong. Any transducer that can produce sound can act as a microphone,
and vice versa. A condensor microphone works just fine as a little,
tiny speaker, just like a dynamic mike.

So Dick, you saying the typical condenser mike that has a
Phantom powered preamp or impedance convertor or such
connected to the actual condenser element will work as a
speaker transducer by hooking a signal up to its
XLR jacks?

No, I did NOT say that:

"Any transducer that can produce sound can act as a
microphone, and vice versa."

A "transducer" is the device in a microphone that converts
acoustical energy (really, mechanical energy) into electrical
energy. That device is quite reversable. So is any other such
transducer, such as dynamic microphone, a ribbon microphone,
a ceramic microphone, a speaker, even a magnetic phono cartridge.

The preamp, impedance converter and such is NOT part of the
transducer, but there to provide electrical-to-electrical
interfacing, gain and such. Since these are NOT part of the
transducer, they are not part of the definition encompassed
by the reciprocity principle.

You might want to add that the transducer must be reciprocal, which
most but not all are. In old telephones there was a transducer type
based on the resistance in carbon powder (I don't know the proper
english name for it, but a direct translation from swedish would be
"carbon-powder-microphone") that was NOT reciprocal, ie it would not
produce any sound if a signal was applied to it.

(Dick Pierce) wrote in message . com...
BOB URZ wrote in message ...
Dick Pierce wrote:

Wrong. Any transducer that can produce sound can act as a microphone,
and vice versa. A condensor microphone works just fine as a little,
tiny speaker, just like a dynamic mike.

So Dick, you saying the typical condenser mike that has a
Phantom powered preamp or impedance convertor or such
connected to the actual condenser element will work as a
speaker transducer by hooking a signal up to its
XLR jacks?

No, I did NOT say that:

"Any transducer that can produce sound can act as a
microphone, and vice versa."

A "transducer" is the device in a microphone that converts
acoustical energy (really, mechanical energy) into electrical
energy. That device is quite reversable. So is any other such
transducer, such as dynamic microphone, a ribbon microphone,
a ceramic microphone, a speaker, even a magnetic phono cartridge.

The preamp, impedance converter and such is NOT part of the
transducer, but there to provide electrical-to-electrical
interfacing, gain and such. Since these are NOT part of the
transducer, they are not part of the definition encompassed
by the reciprocity principle.

You might want to add that the transducer must be reciprocal, which
most but not all are. In old telephones there was a transducer type
based on the resistance in carbon powder (I don't know the proper
english name for it, but a direct translation from swedish would be
"carbon-powder-microphone") that was NOT reciprocal, ie it would not
produce any sound if a signal was applied to it.

"Ethan Winer" ethanw at ethanwiner dot com wrote in message ...
Dick and Svante,

Any transducer that can produce sound can act as a microphone

I was also considering the FET or tube preamp, which of course won't work in
reverse.

So you're saying if you remove the head preamp but leave the polarizing
voltage, you can send a pre-amped signal to the capsule and it will make
noise? Okay, that makes sense.

Yes, in essence, that is an electrostatic loudspeaker :-).



Thanks.

--Ethan

"Ethan Winer" ethanw at ethanwiner dot com wrote in message ...
Dick and Svante,

Any transducer that can produce sound can act as a microphone

I was also considering the FET or tube preamp, which of course won't work in
reverse.

So you're saying if you remove the head preamp but leave the polarizing
voltage, you can send a pre-amped signal to the capsule and it will make
noise? Okay, that makes sense.

Yes, in essence, that is an electrostatic loudspeaker :-).



Thanks.

--Ethan

"Ethan Winer" ethanw at ethanwiner dot com wrote in message ...
Dick and Svante,

Any transducer that can produce sound can act as a microphone

I was also considering the FET or tube preamp, which of course won't work in
reverse.

So you're saying if you remove the head preamp but leave the polarizing
voltage, you can send a pre-amped signal to the capsule and it will make
noise? Okay, that makes sense.

Yes, in essence, that is an electrostatic loudspeaker :-).



Thanks.

--Ethan