The JBL 4311B is one of the most iconic studio monitor speakers of the 1970s, widely used in professional recording environments for its forward, dynamic sound and accurate midrange presentation.

 Designed as a control monitor, the 4311B delivers punchy bass, expressive mids, and crisp highs, making it equally desirable for both studio monitoring and classic hi-fi listening.

This pair has been carefully refurbished with attention to originality, tonal balance, and long-term reliability, while preserving the classic JBL sonic character that made the 4311 series legendary.

  • Model: JBL 4311B
  • Type: 3-way, 3-driver studio monitor loudspeaker system
  • Warranty: 1-Year Service Warranty Included
  • Support: Free technical support before any return request
  • SKU: 1THLC1115

⚠️ Note: Speaker stands are not included.

Customer Service:

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

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“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 driver loudspeaker system
  • Frequency Response: 45Hz to 15kHz
  • Power Handling: 75W
  • Crossover Frequency: 1500, 6000Hz
  • Impedance: 8Ω
  • Sensitivity: 91dB
  • Bass: 1 x 300mm long throw
  • Midrange: 1 x 130mm cone
  • Tweeter: 1 x 36mm direct radiator
  • Enclosure: bass reflex
  • Dimensions: 23.5×14.3×11.7 inch
  • Weight: 46.3 lbs
  • Year: 1979


  • Classic JBL studio monitor sound with strong midrange presence
  • Large 12-inch woofer for punchy, controlled bass
  • Refurbished midrange and tweeter assemblies for consistent output
  • Cabinets refinished while preserving original color and character
  • New grille cloth installed for a clean, authentic appearance
  • Drivers impedance tested and channels matched


1. Driver Testing & Impedance Verification

All drivers were professionally tested for functionality and electrical health

Impedance measurements were taken on all drivers to confirm proper values and balanced performance between channels

Results confirm healthy drivers operating within correct tolerance, with no voice coil rub or abnormal behavior

Frequency sweep tests verified clean output across low, mid, and high frequencies

2. Midrange & Tweeter Restoration

Both midrange and tweeter units were rebuilt/restored to ensure stable response and consistent tonal balance

Drivers were rechecked after restoration to confirm matching output between left and right speakers

3. Cabinet & Grille Work

Speaker cabinets were refinished using the original color tone, maintaining the vintage JBL appearance

Cabinet structure checked for rigidity and resonance control

Original grilles retained, with new grille cloth installed for a refreshed yet period-correct look

4. Cleaning & Final Setup

Internal and external cleaning performed

All terminals cleaned and secured for reliable signal transfer

Speakers were tested together as a matched pair

5. Listening & Performance Test

Multi-hour listening and signal tests performed

Sound confirmed to be balanced, dynamic, and free of distortion

Imaging and tonal consistency verified between both speakers

RESULT

A properly restored pair of JBL 4311B studio monitors, delivering the classic, forward JBL sound with renewed reliability, matched performance, and preserved vintage aesthetics — ready for serious listening or studio use.


⚠️ Note: Speaker stands are not included.

✅ Backed by 1-Year Warranty (repair or replacement)



  • JBL / Harman Kardon vintage receivers and amplifiers
  • Pioneer SX series receivers (SX-850, SX-950, SX-1050)
  • Sansui AU or G series amplifiers
  • Marantz 22xx series receivers

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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.




 
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