Instead of taking pictures, I wound up acquiring, through an exchange of equal value, a pair of owner-designed and built bass-reflex cabinets. Inside each cabinet, I found an Electro Voice SP12B, a Calrad CN-2 crossover, and an Atlas Sound HR-3 horn tweeter.
|Atlas HR-3 - Calrad CN-2 - Electro Voice SP12B|
The Atlas HR-3 tweeter appears to date the bass-reflex project at sometime after 1958. Here is some advertising from the magazine Audio, February 1958:
|Atlas Sound HR-3 Horn Tweeter (Audio February 1958)|
|Atlas Sound HR-3 Horn Tweeter 1|
|Atlas Sound HR-3 Horn Tweeter 2|
|Calrad CN-2 crossover label|
|Calrad CN-2 crossover schematic|
The SP12B woofers are the same as you will find in a previous post, Corner Speaker Pair with ElectroVoice SP12B Speakers. Here is some advertising from Hi-Fi Stereo Review, February, 1962, courtesy of http://vintagevacuumaudio.com/:
|SP12B Ad in Hi-Fi Stereo Review February 1962 - p1|
|SP12B Ad in Hi-Fi Stereo Review February 1962 - p2|
|Bass-Reflex Cabinet Interior 1|
|Bass-Reflex Cabinet Interior 2|
|Bass-Reflex Pair Outside For Testing|
These have a very lively sound and will definitely make great Party Speakers. I moved these with the wheelbarrow pictured. I am thinking of adding the Jensen tweeters found in the Magnavox speakers featured in the post, More on Plywood Horns and Poor Man's Horn Driver, to the Corner Speaker Pair with ElectroVoice SP12B Speakers.