Speakers from the 1920’s

Horn Speaker, Horn Drivers, Cone Speakers and electromagnetic speakers. From the 1920’s.

[@user-vj7dp2ps9r]

Interesting. Looks like they designed a lot of these speakers to work with a wide variety of radios/amps.

[@julesl6910]

This is awesome, electronics knowledge and history is fascinating. These speakers are gorgeous! For those interested, these are high impedance speakers, and here's a bit more info into what that means. Impedance does not apply to DC voltage. Impedance is a concept used in AC (alternating current) circuits and is a measure of the opposition to the flow of AC current. It combines both resistance (which opposes the flow of current in both AC and DC circuits) and reactance (which opposes the flow of AC current specifically due to inductance and capacitance). A 1920's horn speaker typically requires a higher voltage to operate effectively. Impedance is essentially the opposition that a circuit presents to the flow of alternating current (AC), and a higher impedance means that less current will flow for a given voltage. To produce the same amount of power (which is a function of both current and voltage), a higher impedance speaker needs a higher voltage to compensate for the lower current. This relationship is described by Ohm's Law (V = I * R) and the power formula (P = V^2 / R), where V is voltage, I is current, R is impedance, and P is power. To produce the same power (1 watt) in an old RCA 1920s horn speaker with an assumed 4,000-ohm impedance, you would need approximately 63.25 volts, compared to the 2.83 volts needed for a modern 95 dB 8-ohm speaker.

[@user-bo8eq7ki5w]

Thanks for the visual presentation of the horn-loudspeaker models made in the USA. I am a humble radio lover. There are old radio tube magazines, but when I tried to imagine how to make SUCH a CURVED DIFFUSER for my regenerative receiver, I was puzzled))). Damn, - "forbidden technologies of the ancient Americans")))) 73.

[@curlyzim1]

Thanks for watching. Good luck with your hobbies and projects. 73’s Mark

[@user-bo8eq7ki5w]

@@curlyzim1 Thank you Sir!))