The TRIO12 is a driver designed to be used primarily with the matching APR passive radiators. Sealed enclosure recommendation for a Q of .707 is 2 cu ft. Ported is 4.5 cu ft, round ports are very long so a slot port of 3.5" H x 6" W x 27.5" L is recommended..

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Datasheet (PDF)

Download the Quartet12B construction guide.

Quartet12B Consturction Guide (PDF)

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Glossary of audio terms