JBL 4312A Control Monitor Speaker Pair

3-Way Mirror-Imaged Monitors – Walnut Veneer – Restored – 1-Year Warranty

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

About This Pair

Up for sale is a professionally restored pair of JBL 4312A Control Monitors,
a classic 3-way professional monitor design from JBL.

Each speaker uses a 12-inch JBL 2213H Aquaplas-coated woofer, a  5-inch JBL cone midrange, and a 1-inch JBL 035Ti pure titanium dome tweeter, operating through the JBL passive crossover network.104H-3 midrange drivers inspected and tested

This is a mirror-imaged stereo pair with Walnut veneer cabinets,
black fabric grilles, front-mounted midrange and high-frequency level controls,
and the direct, dynamic presentation associated with JBL Professional monitors.

Key Highlights

• JBL 4312A mirror-imaged 3-way control monitor pair
• 12-inch JBL 2213H Aquaplas-coated woofer
• 5-inch JBL cone midrange
• 1-inch JBL 035Ti pure titanium dome tweeter
• JBL 3112D passive crossover network
• 8-ohm nominal impedance
• 100-watt power capacity
• 91 dB sensitivity, 1W / 1m
• 45 Hz – 20 kHz ±3 dB frequency response
• Front midrange and high-frequency level controls
• Walnut veneer cabinets with black fabric grilles
• 1-Year HQaudios Technical Warranty

Professional Restoration & Testing

Before Restoration

The pair was inspected to evaluate the mechanical, electrical, acoustic, and cosmetic condition of both cabinets and all model-specific components.

• 2213H woofers inspected for physical condition and proper operation
• Midrange drivers inspected and tested.
• 035Ti tweeters inspected and tested
• Crossover networks inspected
• Front-panel level controls checked
• Terminals, internal wiring, cabinets, and grilles evaluated

During Restoration

Service was performed according to the needs of this specific pair while preserving the model’s original JBL engineering and intended operating design.

• Drivers checked and serviced as required
• Crossover operation verified and serviced as required
• Front-panel level controls checked and cleaned as required
• Terminals, accessible wiring, and connection points inspected
• Cabinets, grilles, baffles, and control areas carefully cleaned and detailed

After Restoration

• Correct woofer, midrange, and tweeter operation verified
• Polarity and phase consistency checked
• Crossover behavior and frequency-band integration evaluated
• Front-panel level controls tested
• Terminal function confirmed
• Left/right stereo balance checked
• Extended real-world listening test completed

Sound Character

The JBL 4312A delivers the direct, dynamic presentation associated with JBL Professional monitors.
The 12-inch 2213H woofer provides strong low-frequency impact, while the 104H-3 midrange and
035Ti titanium tweeter provide clear vocal presence and detailed upper frequencies.
Front-panel midrange and high-frequency controls allow useful tonal adjustment for room acoustics and listening preference.

Cosmetic Condition

This pair presents very well overall in restored vintage condition. The Walnut veneer cabinets, black front baffles, fabric grilles, controls, and driver areas appear clean overall.

• Cabinets: Walnut veneer with normal vintage wear as shown in the photos
• Front Baffles: Clean overall with the correct 4312A driver layout
• Drivers: Woofer, midrange, and tweeter assemblies inspected and tested
• Controls: Front-panel midrange and HF controls present and operational
• Grilles: Black fabric grilles included

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

Specifications

Video Demo & Additional Photos

A sound-demo video of this exact pair is included so you can hear both speakers operating before purchase.

Suggested Pairing

The JBL 4312A is an 8-ohm, 91 dB-sensitive monitor and can be paired with a wide range of quality vintage and modern amplifiers. Clean power and avoiding sustained clipping are more important than simply choosing the highest wattage.

Contact us for amplifier and complete-system matching. Package pricing may be available when purchasing compatible components or matching stands together.

What’s Included

• 1 Pair (2) JBL 4312A Control Monitor Speakers
• Matching Black Fabric Grilles

Speaker stands shown in the photos are NOT included.

Professional Packing & Shipping

Each speaker will be individually packed with reinforced protection around the Walnut veneer, front baffle, fabric grille, level controls, drivers, cabinet corners, and rear terminals.

Heavy-duty protective materials will be used to reduce movement and protect the speakers during transit.

1-Year HQaudios Technical Warranty

This JBL 4312A pair is backed by our 1-Year HQaudios Technical Warranty
for qualifying functional issues under normal intended use.

We also provide ongoing technical support for setup, amplifier matching, speaker placement,
level-control adjustment, and future service questions.