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Vintage 1974 Original Large Advent Masonite Ring Woofers - Matched Pair (Aug 1974) - Voice Coils Intact - Need Refoam
Up for sale is an authentic, highly collectible matched factory pair of vintage August 1974 Original Large Advent (OLA) 10\"/12\" woofers with their iconic factory Masonite adapter rings.
Both drivers bear matching factory ink date stamps from AUGUST 1974 (stamped AUG 17 1974 and AUG 1974) on their heavy square ferrite magnet backplates. Cones bear factory production stamping D53-102 and 033-0002.
Designed by audio pioneer Henry Kloss for The Advent Loudspeaker, these legendary acoustic suspension woofers feature an extended voice-coil throw and the famous masonite mounting collar designed to seat into standard 12\" cabinet cutouts.
Item Details & Specifications:
- Brand / Manufacturer: Advent Corporation (Cambridge, MA, USA)
- Model: Original Large Advent (OLA) Masonite Ring Woofer
- Advent Part / Stamping: 033-0002 / D53-102
- Matching Date Code: AUGUST 1974 (Aug 17, 1974 factory ink stamp)
- Frame Size: 10-Inch active cone mounted to nominal 11.5\" to 12\" outer Masonite flange
- Magnet Design: Vintage heavy square ferrite magnet structure with flat backplate
- Cone Material: Original curved ribbed paper pulp cones with original dust caps
- Compatible Systems: Original Large Advent Loudspeaker (Walnut & Utility cabinets), Dahlquist DQ-10 (which famously used this exact Advent woofer)
- Quantity: 1 Matched Pair (2 Woofers)
Condition & Restoration Notes:
- Voice Coil Testing: Both drivers have been tested with an analog multimeter—both voice coil circuits are continuous, fully intact, and responsive!
- Surround Condition (Needs Refoam): The original 50-year-old factory foam surrounds have dried out and cracked along the seams (see close-up photos). They will require standard Advent Masonite-frame 10\" replacement foam rings installed prior to active listening.
- Cones & Masonite Rings: The brown masonite mounting rings are solid with no breaks. Original ribbed paper cones are intact with no tears or holes. Solder terminals and tinsel leads are clean and secure.
Sold as-is strictly for restoration / refoaming. Please inspect all detailed photos for exact physical condition.
