A friend dug these out of storage and gave them to me. They were never used and look to be perfectly fine in the packaging. I see they were often part of a well known “Minimus 7” bookshelf speaker.
I guess I’m wondering what a nice short path to using them might be? My wife could use some book shelf speakers in her office. But I don’t know where to start in terms of a tweeter or crossover.
Edit: a thread about M7 upgrades directs to these little crossovers. Or there’s this thread about upgrade crossovers.
I guess I’m wondering what a nice short path to using them might be? My wife could use some book shelf speakers in her office. But I don’t know where to start in terms of a tweeter or crossover.
Edit: a thread about M7 upgrades directs to these little crossovers. Or there’s this thread about upgrade crossovers.
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David Weems has a design for the 4" 40-1022 woofer.
It is a closed box of internal dimensions 3.5" x 5" x 8" (d x w x h) for an internal volume of 138 cubic inches, constructed of 1/2" plywood.
The woofer was originally matched with a 3/4" polycarbonate hard dome tweeter (Radio Shack model 40-1376).
Here is a similar modern tweeter: https://www.parts-express.com/Visaton-DTW72-1-2-Polycarbonate-Dome-Tweeter-8-Ohm-292-676?quantity=1
The woofer is run direct from the amplifier terminals while the original tweeter had a 3.3 uF capacitor in series.
The original tweeter was attenuated following the capacitor by an L pad consisting of Rs = 5 ohm and Rp = 10 ohm.
It is a closed box of internal dimensions 3.5" x 5" x 8" (d x w x h) for an internal volume of 138 cubic inches, constructed of 1/2" plywood.
The woofer was originally matched with a 3/4" polycarbonate hard dome tweeter (Radio Shack model 40-1376).
Here is a similar modern tweeter: https://www.parts-express.com/Visaton-DTW72-1-2-Polycarbonate-Dome-Tweeter-8-Ohm-292-676?quantity=1
The woofer is run direct from the amplifier terminals while the original tweeter had a 3.3 uF capacitor in series.
The original tweeter was attenuated following the capacitor by an L pad consisting of Rs = 5 ohm and Rp = 10 ohm.
YMMV
38 years ago
"EXPERIMENTS WITH TAPERED PIPES", David Weems, p18
(p19 bottom left Radio Shack #40-1022)
Speaker Builder 1987-02
https://www.worldradiohistory.com/Archive-All-Audio/Speaker-Buider/Speaker-Builder-1987-02.pdf
38 years ago
"EXPERIMENTS WITH TAPERED PIPES", David Weems, p18
(p19 bottom left Radio Shack #40-1022)
Speaker Builder 1987-02
https://www.worldradiohistory.com/Archive-All-Audio/Speaker-Buider/Speaker-Builder-1987-02.pdf
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55-60 years ago, I heard Minimus speakers demonstrated at Radio Shack. They sounded so bad I would not bother to hook one up to try it out. My '59 Ford car radio sounded better, on the AM band. 6"x9" driver mounted in a 5 cu ft dashboard. When the surround rotted (windows leaked) a Quam replacement from Electrotex sounded as good.
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