My Vintage Pioneer HPM-100 Speakers (Pics)

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IIRC, the super tweeter is crossed in at 12kHz.

Yes you are correct !

Pioneer HPM-100 - Wikipedia, the free encyclopedia

Enclosure: Bass-reflex bookshelf type
System: 4-speaker, 4-way system
Woofer: 12 inch (30 cm) carbon fiber blended cone type
Mid-Range: 4 inch (10 cm) cone type
Tweeter: 1-3/4 inch (4.5 cm) cone type
Super tweeter: High Polymer Molecular Film
Nominal Impedance: 8 ohms
Frequency Range: 30 to 25,000 Hz
Sensitivity: 92.5 dB/W (at 1m distance)
Maximum Input Power: 100 watts (“A” crossover) / 200 Watts (“B”,”C” crossovers)
Crossover Frequency: 300 Hz (Low-Mid), 4,000 Hz (Mid-High), 12,000 Hz (High-Superhigh)
Dimensions: 15-3/8(W) x 26-3/8(H) x 15-1/2(D) inches (390(W) x 670(H) x 393(D) millimeters)
Weight: 58 lb. 14 oz./26.7 kg
 
I remember servicing this kind of speakers (long ago). Sometimes there were sparks protruding from the super tweeters, scary stuff.

Open circuit just at the film connection and reactive discharge from the tweeter transformer made sparks possible.
 
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