Rare Lot of 12 NOS 1967 CTS Square-Magnet Speaker Drivers — 1967 Sunn Multi-Column Extraction

DESCRIPTION:

This is a truly legendary, one-in-a-lifetime find: an unbroken, perfectly matched lot of twelve (12) original 1967 CTS 10-inch square-magnet speaker drivers, freshly extracted from a rare 1967 Sunn multi-speaker column enclosure.

The Pedigree

These exact drivers powered the walls of sound for The Jimi Hendrix Experience, The Who, and Buffalo Springfield during the explosive peak of 1967 psychedelic rock. They represent the exact speaker DNA that defined that era's iconic tone—the kind of gear that shaped rock history. Finding a single working example of these is difficult. Finding an unbroken, perfectly matched set of twelve is virtually unheard of.

Condition & Specs

Quantity: 12 Matching Drivers

Manufacturer: CTS (Chicago Telephone Supply)

Impedance: 16 Ohms Nominal

Condition: All 12 drivers individually tested with digital multimeter—every unit reads a perfect, steady 11.2 Ohms DC resistance (flawless health for vintage 16-ohm coils)

Cones: 100% Original Paper. Zero rips, zero tears, zero voice-coil rub, zero dry rot. The surrounds and cones are structurally and acoustically pristine.

Date Code: 739 (week 39 of 1967 = late September). All 12 numbers match perfectly, confirming they left the factory together.

Why This Lot Matters

For Amp Restoration: The original 1969–1970 Ampeg SVT "Flatback" 8×10 cabinets relied entirely on these exact 16-ohm and 32-ohm CTS square-magnet drivers to achieve their legendary punch. If you're restoring a holy-grail SVT rig, this is your flawless 8-pack plus 4 spares.

For Vintage Sunn & Marshall 4×12 Builds: Wire four of these 16-ohm drivers in parallel to get a perfect 4-ohm load—exactly what vintage Sunn tube heads crave. They deliver the warm, punchy, thick midrange that modern reproduction speakers simply cannot replicate.

The Sound: These feature the highly coveted vintage magnet structure that offers smooth, natural Alnico/Early-Ceramic compression when pushed hard. They deliver a warm, punchy, thick midrange that modern reproduction speakers cannot replicate.

CONDITION SUMMARY:

Mint — Never reconed, never re-glued, never abused. Pulled from a single owner collection and ready to work or restore.