JBL C70 Alpha I Speaker Pair – 123A-1 Woofer + PR12 Passive Radiator – Restored

Professionally Restored & Tested by HQaudios – Backed by Our 1-Year Warranty.

About This Pair

We are offering this restored pair of JBL C70 Alpha I vintage loudspeakers, one of JBL’s large furniture-style home loudspeaker systems from the late-1960s era.

The C70 Alpha I uses a distinctive JBL driver combination consisting of a 123A-1 12-inch woofer, LE5-2 midrange, and LE20-1 high-frequency driver, together with a PR12 12-inch passive radiator.

This active driver combination shares important DNA with the early JBL systems associated with the original L100 Century and 4310 generation, while the C70 takes a very different approach with its substantially larger furniture-style cabinet and passive-radiator bass loading.

This pair has been restored, inspected, cleaned, and tested by our HQaudios team and is ready for its next system.

Key Highlights

• JBL C70 Alpha I vintage loudspeaker pair
• Large furniture-style JBL cabinet design
• JBL 123A-1 12-inch low-frequency driver
• JBL LE5-2 dedicated midrange driver
• JBL LE20-1 high-frequency driver
• JBL PR12 12-inch passive radiator
• Separate midrange and high-frequency level controls
• Driver architecture closely related to the early L100 / 4310 generation
• Professionally restored and tested by HQaudios
• Both front grilles included as shown
• 1-Year HQaudios Warranty

Why the JBL C70 Alpha I Is Special

The C70 Alpha I represents an interesting chapter in early JBL home loudspeaker design.

Its 123A-1, LE5-2, and LE20-1 active driver combination is closely related to the early JBL architecture that became well known through the original L100 Century and 4310 generation.

The C70, however, is not simply an L100 installed in a larger cabinet. JBL paired this driver system with a PR12 passive radiator and placed it in a much larger, low-profile furniture-style enclosure.

The result is a distinctly different JBL design that combines familiar early JBL driver technology with a larger cabinet volume and passive-radiator low-frequency system.

For collectors and listeners who appreciate classic JBL engineering, the C70 Alpha I offers a less commonly encountered alternative to the better-known monitor-style designs of the same era.

HQaudios Restoration & Testing

Technical Condition

The low-, midrange, and high-frequency sections of both speakers were inspected and tested during our restoration process.

The level controls, speaker connections, and overall system operation were also checked before the pair completed final testing.

Sound Character

The C70 combines the dynamic character associated with JBL’s early 12-inch 123A family with a dedicated LE5-2 midrange and LE20-1 high-frequency driver.

Its large cabinet and PR12 passive-radiator system give the C70 a different presentation from JBL’s more compact designs, with a substantial sense of scale and a strong low-frequency foundation.

This combination works especially well with classic rock, jazz, blues, soul, funk, and live recordings where drums, bass, vocals, and dynamic impact are important to the presentation.

Cosmetic Condition

The furniture-style wood cabinets have been restored, cleaned, and detailed and present very well for their age.

• Cabinets:
  The wood surfaces were restored and detailed while retaining their existing brown wood-tone color and vintage character. Normal signs of age and use remain.
• Grilles:
  Both woven front grilles are included as shown. The grille assemblies were cleaned, and the fastening points identified during inspection were addressed.
• Front Baffles:
  The black front baffles present cleanly and contrast with the white-cone low-frequency sections.
• Drivers:
  The woofer, passive radiator, midrange, and high-frequency assemblies are shown clearly in the actual product photos.

Please review all listing photos carefully, as they show the actual pair and form an important part of the cosmetic description.

Specifications

What’s Included

• One pair of JBL C70 Alpha I loudspeakers shown in the listing photos
• Two front grilles shown in the listing photos

Only the items shown in the photos or specifically listed above are included.

Professional Packing & Shipping

These are large vintage JBL cabinets, so extra care is taken during preparation for transportation.

The grille areas, cabinet surfaces, edges, and corners are carefully protected before final packing.

Heavy-duty protection appropriate for large vintage loudspeakers is used to help minimize movement and reduce the risk of damage during transit.

1-Year HQaudios Warranty

This professionally restored speaker pair is backed by our 1-Year HQaudios Warranty.

Our support continues after delivery. If you have questions about setup, amplifier matching, or operation, our team is available to help.

HQaudios – Vintage Audio Restored with Care.
Real Product · Real Sound · Professional Restoration · Safe Packing · After-Sale Support