What are these odd intercom speakers?

These are at a very old church/school building that I just posted about on the fire alarms. I need help identifying some of the speakers that they use.


This is one of the speakers I am wondering about. Many of the classrooms in the original areas of the building have these. Based on the decor, I’m thinking these areas were last remodeled in the early-mid 1900’s. Based on the fact that they are yellowing and how they look, I think they are made out of plastic. In the hallways, they also have two sided pendant versions of these that are hanging from the ceiling.



These are the speakers in the gymnasium. They appear to be bullhorn style speakers, but I’ve never seen anything quite like them. There are four of these in the gym and they are hanging from wires about 10 feet below the ceiling.


The renovated areas that got drop ceilings have these speakers. I don’t need any help identifying these.

There are a few other types of wall mounted speakers throughout the building, but these are the ones that I am interested in identifying.

All of these speakers appear to be in use and I know I have heard announcements from all of them. I don’t know what the PA system is, but it doesn’t appear to have a pre-announce tone and I know it sounds an emergency tone for weather emergencies.

I would greatly appreciate if anyone could identify the first two types of speakers. I’ve always wondered what these are but none of my searches have been successful.

I’m not sure what make & model those kind are, but I’ve seen a few places with those kind where I am (forget which exactly but I know I’ve seen those air vent-like speakers before).

Yeah: that’s your standard generic run-of-the-mill ceiling speaker that you see in just about every commercial building that has a PA system: no idea who the main makers of those are though (if they even have one).

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I recognize the last two, those are probably Atlas or University Sound (possibly even Jensen) double bell units.

worldradiohistory.com has industry-wide catalogs of all kinds of components. You can find them under the “Technical & Electronics” section, which may have the designs you are looking for

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anyone know this one? I would assume it’s a square version of #2:

The second one was originally a Lowell design from the early 1960s, but has been rebranded by numerous other companies, such as Amalgamated Wireless of Australia (AWA) and MG Electronics