University 312 Vintage Speaker Driver – Restored – 1-Year Warranty 

Condition: Tested, serviced and restored – Excellent sound. With over 2,000 fully serviced and certified vintage receivers/speakers delivered. HQaudios stands as one of the most reputable sources for high-quality audio units. If you’re browsing on a mobile device, scroll down and tap the Title to view the complete description.

1/ ABOUT 

The University 312 Series 200 is a classic American-made vintage coaxial speaker driver designed during the golden era of home hi-fi audio systems. Manufactured in White Plains, New York, this driver combines woofer and high-frequency elements into a single-axis design, delivering the coherent sound presentation and smooth imaging that vintage coaxial speaker enthusiasts continue to appreciate today.

Its sound character is warm, natural, and highly engaging, with strong vocal presence, smooth midrange response, and relaxed high frequencies suitable for long listening sessions. The large paper-cone structure and classic horn-loaded high-frequency design create an effortless and room-filling analog presentation that pairs exceptionally well with tube amplifiers and low-powered vintage systems.

The University 312 also reflects the craftsmanship and engineering philosophy of early American hi-fi audio, featuring cast-frame construction, integrated brilliance control, and traditional crossover tuning that collectors continue to value decades later.

⚠️ Important Note – Vintage Market Risks
Vintage speaker drivers over 50 years old require careful inspection before use. On the general market, many units may suffer from cone damage, weakened suspensions, voice coil issues, oxidation, crossover deterioration, or non-original modifications that affect reliability and sound quality.

At HQaudios, every vintage driver is carefully inspected, cleaned, tested, and verified to preserve the original sonic character while ensuring stable performance and long-term usability.

HQaudios – Restored & Tested Unit
This University 312 Series 200 driver has been professionally inspected and tested by HQaudios technicians. The cone structure, coaxial high-frequency section, terminals, brilliance control, and overall acoustic operation were carefully evaluated to ensure stable and reliable performance

• Condition: Very Good – fully cleaned & restored
• Warranty: 1 year (repair or replacement)
• Free Support: Must be used before requesting return
• Ready to use, no further adjustment required

Why This Listing

Unlike unverified vintage units on the market, these vintage speaker driver have been restored and thoroughly tested, ensuring stable sound quality and reducing the risks associated with buying vintage equipment.

Customer Service

Once your item arrives, if you have questions about operation or setup, please contact us anytime. We are here to support you before and after purchase.

Notes

– This item is designed for the U.S. market and operates on U.S. power standards. If you are located outside the United States, please contact us before purchasing so we can help confirm compatibility for your setup.

– The actual color and appearance of the product may slightly vary due to lighting conditions, camera settings, and display differences. Some angles may not fully reflect every detail of the item. Please review all descriptions carefully and feel free to message us for clarification.

**TRADE-IN PROGRAM

If you have any vintage audio equipment (receivers, speakers, cassette decks, reel-to-reel, etc.) and want to upgrade to a serviced unit, please contact us for the best offer. You only need to pay the difference between your item and ours.

2/ SPECIFICATIONS

• Type: 3-Way Loudspeaker System
• Power Handling: 25W – 35W
• Recommended Amplifier: 10W – 50W
• Sensitivity: 100dB (1W @ 1m)
• Frequency Response: 30Hz – 40kHz
• Bass: 1 x 12″ Coaxial Driver
• Midrange: Integrated Diffaxial Driver
• Tweeter: Integrated High Frequency Driver with Level Control
• Crossover Frequency: Built-In Mechanical Crossover Network
• Enclosure: N/A
• Dimensions (W x H x D): N/A
• Weight: N/A

3/ KEY FEATURES

• Classic American coaxial speaker design – smooth and coherent sound presentation
• Warm analog tonal character – ideal for jazz, vocals, acoustic, and classic recordings
• Cast-frame construction – durable vintage engineering and stable resonance control
• Built-in brilliance adjustment control – customizable high-frequency response
• High-efficiency vintage driver design – excellent compatibility with tube amplifiers
• Large paper-cone woofer structure – natural bass and rich midrange presentation
• Made in White Plains, New York – authentic vintage American hi-fi craftsmanship

4/ RESTORATION & TECHNICAL PROCESS

Original condition issues

• Driver assembly showed signs of age and long-term storage
• Cone condition and suspension required detailed inspection
• Brilliance control and terminal condition required verification
• Internal acoustic performance required full testing

HQaudios Restoration Process

Driver & Cone Inspection

• Woofer cone inspected carefully for structural integrity
• Coaxial high-frequency section tested thoroughly
• Voice coil movement checked for smooth operation
• Suspension and cone edge condition evaluated carefully

Control & Terminal Service

• Brilliance adjustment control inspected and tested
• Speaker terminals cleaned and verified
• Wiring continuity checked carefully
• Phase and signal stability confirmed

Acoustic & Functional Testing

• Driver tested using multiple amplifier setups
• Frequency response behavior evaluated carefully
• Imaging and tonal balance verified
• Long-duration playback testing completed successfully

Results after restoration

• Smooth and natural vintage coaxial sound presentation
• Strong vocal clarity with rich analog musicality
• Stable and reliable acoustic performance
• Excellent compatibility with vintage tube systems
• Highly collectible classic American speaker driver design

5/ SUGGESTED PAIRINGS 

The University 312 Series 200 pairs exceptionally well with warm and low-to-medium powered vintage amplifiers that complement its efficient coaxial driver design and natural tonal balance.

• Fisher 500C – smooth tube warmth with excellent vocal presentation
• Scott 299 Series – classic tube pairing with rich analog character
• Marantz 2230 – warm solid-state synergy with balanced musicality
• McIntosh MC240 – highly refined vintage American tube combination

With proper enclosure design and amplifier matching, the University 312 delivers a highly engaging and authentic vintage hi-fi listening experience.
HQaudios is available to assist with enclosure recommendations and complete system matching before purchase.

6/ PACKAGING & SHIPPING

Secure Packaging:

• High-density foam inserts with 5-layer corrugated cartons
• Additional internal padding and wrap for transit protection
• Double-wall outer box with corner guards and straps

Shipping Details:

• Dispatch Time: Ships within 3 business days
• Carrier: UPS Ground (tracked & insured)
• Signature Required: Yes (as buyer’s request)
• Transit Time: Typically 3–7 business days (USA)

International Shipping:

We offer global delivery through the eBay International Shipping Program. eBay handles customs, duties, and tracking.

📦 Note: Packaging may vary slightly depending on unit size or availability, but safety and protection are always our top priority.