Vintage Radio Speakers
some notes & information


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A group of Amplion horn speakers (early 20's)
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In the very early years of radio, headphones was about all there was for sound reproduction. The horn speaker became the  norm in the late teens. Most early horn speakers consisted of a sound magnifying horn with a what was not much more than the sound element of a headphone attached to the base.

When you purchased your new radio in the early 1920's most of them did not have enough power to drive a loudspeaker so headphones was how you listened. Many companies offered one or two stage (some had  three) audio amplifiers that would amplify the weak audio sound enough to drive a loud speaker. Early amplifiers and loudspeakers of any brand of could be attached to the simplest of radio receivers (even crystal sets) so the whole family could listen.

Loud speakers were usually an option and if desired were purchased separately. Most all permanent magnet speakers of the 1920's had an  impedance of around 2000 ohms (DC resistance; typically 1500 - 2000 ohms). All permanent magnet (2 wire type) speakers were compatible with any radio of that era that could drive a loudspeaker. This applies to both the horn and disc type speakers. The disc (or cone speaker) were introduced in the mid late 1920's and were compatible (and proper for use) with any brand 1920's radio. This applies to either battery or the early AC sets. The exception was some of the AC operated sets made in the late '20's required an electrodynamic speaker (more on this type later).

I should mention that there were certain speakers that were promoted but not included with the purchase of a particular Radio, for example; the Radiola 44 and 60 were both promoted with the Radiola 103 speaker, these are shown on the "Radiola Info" page. The Radiola Super-Heterodyne portable and the Radiola IIIA were sold with the UZ-1320 0r UZ-1325 speaker.

It was quite common to have a radio with a speaker brand of another company as many speaker companies did not make radios and some radio companies did not make speakers. It is proper and ok to use any radio - speaker combination of that era as few sets came with a speaker unless it had one built-in or a combo pack was offered. There were a few (very few) speakers designed (cosmetically) to go with a particular radio, an example was the RCA Radiola 33 receiver that was sold with the Radiola 100B speaker.

Speakers with only 2 wires are permanent magnet (PM) type. Speakers with 3-4 or more wires are "electro-Dynamic) and designed electrically for a particular radio or amplifier. They will have a special plug that plugs into the radio chassis or hard-wire in. These type speakers were not usually compatible with other radios. You should never apply power to a radio with a proprietary  speaker (electric sets) without the speaker  connected. Doing so will almost always result in damage to the radio's power supply. These 3-4 wire speakers  are "electro-dynamic", that is their magnet is energized by a coil (field coil) which is part of the power supply circuitry of the radio and becomes a magnet when powered.  A good example of this type is the Atwater Kent 55.

I am often ask if these early speakers can be operated from a modern radio or amplifier, that answer will be found on my Tech Tips page.

< cone speaker gallery
< horn speaker gallery
< Radiola Speakers
< AVAILABLE: Vintage original style cable with phone tip "pin plugs" (like shown on the above speaker).

< Replacement speakers for your Radio, TV or Amplifier

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>> Important info about 1920's radio speakers
© C.E. Clutter


Member of:
Northwest Vintage Radio Society

Member of:
Antique Wireless Association