Diatone, Pioneer Speaker Technical Specifications/Instruction Manual Set. Diatone (Mitsubishi Electric) P-610 A, B (16cm Full Range) Pioneer PE-16 (16cm Full Range) Pioneer PIM-16 A (16cm Full Range) Pioneer PT-8A (Horn Tweeter) Pioneer Speaker Catalog Specifications, frequency response, and enclosures (sealed, bass reflex) for each speaker are described. About 50 years ago, there was a boom in 16cm (6.5-inch) full-range speakers, and riding that wave, I built the specified bass reflex enclosures for the PE-16 and PIM-16, and listened to the Diatone P610 on a flat baffle. I gave these away to friends and no longer have them. I fondly remember building the enclosures in the yard of my boarding house during my student days. These technical specifications were included with the purchase of the speakers and are originals, not copies. There are handwritten notes on the Diatone specifications regarding enclosure dimension corrections. Thank you for looking. Reduced price from 720 yen to 620 yen. Thank you for your consideration.