JBL 4311B Vintage Control Monitor Pair – Gray – Restored – 1-Year Warranty

$2,499

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  • Authentic JBL 4311B 3-Way Control Monitor Speakers
  • 3-Way, 3-Driver Professional Monitor design for accurate wide-range reproduction.
  • 12-inch JBL 2213H Low-Frequency Driver provides powerful bass reproduction with strong dynamic capability.
  • 5-inch JBL LE5-10 Midrange Driver delivers clear and articulate vocal and midrange reproduction.
  • 1.4-inch JBL LE25-2 High-Frequency Driver provides extended high-frequency detail and transient response.
  • 45 Hz – 15 kHz Frequency Response provides wide-range reproduction for music listening and monitoring.
  • 91 dB Sensitivity allows the 4311B to produce strong acoustic output with relatively modest amplifier power.
  • 8 Ohms Nominal Impedance provides compatibility with a wide range of quality amplifiers.
  • 75W Continuous Program Power Rating provides substantial power-handling capability for its compact monitor format.
  • 1.5 kHz / 6 kHz Crossover Frequencies divide the signal between the woofer, midrange, and high-frequency sections.
  • Front-Panel Midrange and High-Frequency Level Controls allow the tonal balance to be adjusted for the listening environment.
  • Bass-Reflex Enclosure provides extended low-frequency performance from the compact cabinet.
  • Classic JBL Professional Monitor Design makes the 4311B equally desirable for vintage studio systems and home audio applications.
  • Professionally Restored and Fully Tested by HQaudios before being approved for sale.

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SKU: 12QE0180 - VS23 Categories: , ,

JBL 4311B Control Monitor Speakers Pair – Original JBL Gray
Professionally Restored by HQaudios – Inspected & Tested – Backed by Our 1-Year Warranty

KEY HIGHLIGHTS
JBL 4311B Control Monitor – classic 3-way studio monitor from JBL’s 43-series
12-inch JBL 2213H white-cone woofer (model labels shown in the photos)
5-inch cone midrange and 1.4-inch (36 mm) high-frequency driver
Front-panel midrange and high-frequency level controls
45 Hz – 15 kHz (±3 dB), 8-ohm nominal impedance, 91 dB sensitivity
Original JBL Gray color scheme with black grilles
Every driver checked, crossover capacitors checked, RTA-verified frequency response and phase
Professionally inspected, restored and tested by HQaudios
Backed by our 1-Year HQaudios Warranty

PRODUCT OVERVIEW
The JBL 4311B belongs to JBL’s famous 4311 control monitor family, the compact three-way studio monitor that became an icon in both recording studios and home listening rooms. It combines a 12-inch woofer, a 5-inch midrange and a 1.4-inch high-frequency driver, crossed over at 1.5 kHz and 6 kHz.
Front-panel midrange and high-frequency level controls let you tailor the balance to your room. JBL rated the 4311B at 91 dB sensitivity and 8 ohms nominal impedance, with a recommended amplifier power of 75 W continuous.
This JBL 4311B pair features the original JBL Gray color scheme, preserving its classic professional studio monitor appearance.


HQAUDIOS RESTORATION & TESTING

Before Restoration
The JBL 4311B pair was carefully inspected upon arrival to evaluate its mechanical, electrical, and cosmetic condition.
Each cabinet, cone, surround, and spider was checked for originality and for glue joints that had loosened or shifted with age. Every driver was tested by hand for voice-coil rub – a scratching noise or a stiff, binding cone indicates a shifted or heat-damaged voice coil. The DC resistance of every driver was checked against its nominal impedance. The crossover networks were examined for bulging or leaking capacitors, each capacitor was measured against its original value (within 10% tolerance), and the level-control attenuators were checked for noisy or worn contact surfaces.
The inspection results were used to determine the work required for this specific pair.

During Restoration
Based on the inspection results, this JBL 4311B pair was restored according to HQaudios’ technical standards while preserving its original engineering and voicing.
Original Drivers: All drivers retain their original cones and diaphragms, which are in good condition; no driver required replacement on this pair.
Cleaning & Detailing: All drivers, crossover boards, and terminals were cleaned, and the cabinets and grilles were cleaned and detailed.

After Restoration / Final Testing
Once restoration was completed, the pair underwent comprehensive testing under real operating conditions.
Frequency Response: Measured with an RTA (real-time analyzer) and a calibrated sound card to confirm a flat, well-balanced response and close matching between the two speakers.
Phase Check: Driver polarity was verified using a phase-reversal check to ensure both speakers play in correct phase.
Level Controls: The midrange and high-frequency level controls were checked on both speakers.
Listening Test: The pair underwent an extended real-world listening test with a wide range of music to confirm dynamics, tonal balance, and stereo imaging.
Final QC: Only after completing HQaudios’ restoration and testing process was the pair approved and prepared for its next owner.

CONDITION

Technical Condition
Woofers: JBL 2213H 12-inch white-cone woofers (labels shown in the photos), checked on both speakers
Midrange & Tweeters: JBL drivers, checked on both speakers
Crossover Networks: Inspected; capacitors checked against original values
Level Controls: Midrange and high-frequency controls checked
Input Terminals: Original JBL push-type speaker terminals
Frequency Response & Phase: RTA-verified, polarity checked

Cosmetic Condition
Cabinets: Original JBL Gray color scheme, gray front baffles
Grilles: Black grilles included, as shown in the photos
Front Panels: Original JBL 4311B badges and level-control panels
Overall Presentation: The speakers present in excellent restored vintage cosmetic condition. Please review the actual photographs for complete cosmetic details.

All Drivers Checked
Crossover Capacitors Checked
RTA Frequency Response & Phase Verified
Final Listening Test Completed

SPECIFICATIONS
Brand: JBL
Model: 4311B Control Monitor
Type: 3-Way Bass-Reflex Bookshelf / Studio Monitor
Low Frequency Driver: 12-inch JBL 2213H woofer
Midrange Driver: 5-inch cone midrange
High Frequency Driver: 1.4-inch (36 mm) tweeter
Crossover Frequencies: 1.5 kHz / 6 kHz
Frequency Response: 45 Hz – 15 kHz (±3 dB)
Nominal Impedance: 8 Ohms
Sensitivity: 91 dB (1 W / 1 m)
Power Capacity: 40 W continuous sine-wave power / 75 W continuous program power
Controls: Front-panel midrange and high-frequency level controls
Input Terminals: Push-type speaker wire terminals
Dimensions: 23.5 H × 14.25 W × 11.75 D in – each speaker
Weight: Approx. 44 lbs per speaker
Finish: Original JBL Gray

WHAT IS INCLUDED
1 Pair of JBL 4311B Control Monitor Speakers
2 Black Grilles shown in the listing photos
IMPORTANT: DISPLAY STANDS SHOWN IN THE PHOTOS ARE NOT INCLUDED WITH THIS SALE.
Only the items specifically listed above are included. Speaker cables and other accessories are not included.

SHIPPING & PACKAGING
Your vintage audio equipment will be professionally packed by HQaudios using protective materials appropriate for its size, weight, and construction. Large or heavy items may be palletized and shipped by freight when required for safer transportation.
HQaudios Professional Shipping and Packaging
Please contact us before purchase for the most current availability information.

1-YEAR WARRANTY & CUSTOMER SUPPORT
Your purchase is backed by our 1-Year HQaudios Warranty. Our team provides support before and after your purchase. If you have questions about setup, operation, compatibility, or your order, please contact HQaudios for assistance.

MORE FROM HQAUDIOS

HQaudios Vintage Audio Repair and Restoration
HQaudios Custom Audio Projects

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