Condition: Excellent – fully tested and serviced 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.

Before the legendary 4311 and L100 took over studios and living rooms, there was the JBL 4310—the original blueprint of JBL’s iconic control monitor sound.

The 4310 was designed for one purpose: accuracy. It was built for engineers who needed to hear every detail, every nuance, every flaw—and every beauty—within a recording. And that DNA is still here.

Listening to the 4310 today feels like stepping into a studio from the golden age of analog. The bass is tight and responsive, never overblown. The midrange is forward, intimate, and incredibly revealing—vocals sit right in front of you. And the highs are clean and precise, giving just enough sparkle without fatigue.

This is not a speaker that hides anything. It tells the truth—and that’s exactly why it remains so respected.

At HQaudios, this pair has been carefully restored to preserve its original studio character while ensuring stable, reliable performance for modern listening.

If you’re searching for the purest form of vintage JBL monitor sound, this 4310 pair is now available at HQaudios.

MODEL: JBL 4310

TYPE: 3-Way Control Monitor Speakers (Pair)

PROTECTION PLAN: 1-Year Warranty Included

FREE SUPPORT: Must be used before requesting return

Importance Note: THIS PAIR WILL BE SHIPPED WITHOUT STANDS

Customer Service:

Once your item arrives, if you have questions about how your item functions or proper settings, please CONTACT US.

TRADE-IN PROGRAM

“If you have any vintage audios (receivers, speakers, cassette, reel to reel…) & want to upgrade with the serviced one, don’t hesitate to contact us for the best deal. You only need to pay for the difference between yours & mine….”

Note:

The actual color of the product may sometimes differ slightly from the photos due to lighting conditions, temperature, and the device used. Some angles in the photos may not fully reflect the product’s condition. Please read the description carefully and feel free to message us if you have any questions

Type: 3-Way, 3-Speaker, Bass Reflex, Bookshelf

Drivers:

Woofer: 12″ (30 cm) Cone Type (123A-1)

Midrange: 5.1″ (13 cm) Cone Type (LE5-2)

Tweeter: 1.4″ (3.6 cm) Cone Type (LE20-1)

Frequency Response: 30 Hz – 15 kHz (±5 dB)

Dispersion: 90° (Horizontal & Vertical)

Power Handling: 50W (Continuous Program)

Impedance: 8 Ohms

Sensitivity: 91 dB

Crossover Frequency: 1.5 kHz / 7 kHz

Dimensions (W × H × D): 14.33 × 23.62 × 11.81 inches

Weight: 50.71 lbs

Original JBL control monitor design – predecessor to 4311 / L100

3-way system with 12” woofer, midrange driver, and tweeter

Tight, accurate bass with fast transient response

Forward, highly detailed midrange ideal for vocals and studio monitoring

Classic white baffle with walnut cabinet aesthetic

Front-mounted level controls for tonal adjustment

Experience the sound that defined a generation.!

These JBL 4310 speakers have been fully refurbished and carefully restored to deliver authentic studio monitor performance with long-term stability, while preserving their original vintage identity.

Restoration & Technical Service

Woofer inspection & restoration: Original 12-inch woofers were inspected, tested, and serviced to ensure proper cone movement, tight suspension, and controlled, accurate bass response.

Midrange & tweeter serviced: Mid and high-frequency drivers were cleaned, tested, and matched to ensure clear, distortion-free output and correct tonal balance.

Crossover service: Original crossover networks were inspected and serviced to restore proper frequency distribution, clarity, and coherence across all drivers.

L-pad controls cleaned: Front level controls were cleaned and treated to ensure smooth, noise-free adjustment with no static or dropouts.

Internal wiring & connections checked: All internal wiring and solder joints were inspected and reinforced to ensure stable, noise-free signal flow.

Cabinet & Cosmetic Work

Cabinets detailed: Cabinets were professionally cleaned and conditioned, preserving the original walnut veneer and vintage appearance.

White baffle restoration: The signature white front baffle was cleaned and refreshed, maintaining its clean studio-monitor aesthetic.

Grilles & cosmetic parts: Grilles were cleaned and reconditioned for a uniform, well-presented look.

Condition Notes (Important)

Minor cosmetic wear consistent with age may be present.

These do not affect sound performance or structural integrity.

Overall condition is well-preserved with authentic vintage character.

Testing & Final Result

Sound tested extensively: Confirmed tight bass, forward and detailed midrange, and clean highs with accurate stereo imaging.

Stable operation: Verified matched pair performance and reliable operation during extended listening sessions.

Result

After restoration, this JBL 4310 pair delivers a pure, honest, and engaging studio monitor sound—fast, detailed, and true to the original recording.

More importantly, the speakers are now fully serviced, stable, and ready for daily use or collection. Available at HQaudios, this is a rare opportunity to own the foundation of JBL’s legendary monitor line.

Marantz 2230 / 2245 – Adds warmth to balance the analytical nature

Sansui AU-717 / 9090 – Strong dynamics with controlled bass

Pioneer SX-1050 – Powerful and balanced full-range sound

McIntosh MA series – Clean, authoritative, and refined pairing

🎁 GET A $100 VOUCHER INSTANTLY WHEN YOU BUY A COMBO!

Each unit is carefully packed using:

Nylon wrap and sealed inner carton

Custom EPE foam corners to protect edges

Double-wall outer box for shock resistance

Plastic straps + handling labels to ensure safe transit

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 model, but safety and protection are always our top priority.