eBay

SOUND DEMO / AUDIO EXPERIENCE

JBL 4343 Studio Monitor Speakers Sound Demo

WATCH SOUND DEMO

For the best audio experience, please use headphones or external speakers.

JBL 4343 Studio Monitors - JBL 2426J Titanium Compression Drivers

15-Inch 4-Way Studio Monitors - Walnut Veneer / Blue Baffles - Serviced by HQaudios - 1-Year Warranty

KEY HIGHLIGHTS

JBL 4343 classic four-way professional studio monitors

Updated with JBL 2426J compression drivers installed by HQaudios

16-ohm JBL 2426J drivers featuring pure-titanium diaphragms

15-inch JBL 2231A low-frequency driver configuration

10-inch JBL 2121 mid-bass driver configuration

JBL 2307 horn / 2308 acoustic-lens system

JBL 2405 ultra-high-frequency slot radiator

Four-way bass-reflex design with front-mounted level controls

Factory crossover points: 300 Hz / 1.25 kHz / 9.5 kHz

Switchable internal passive network / external crossover operation

Walnut veneer cabinets with classic blue front baffles

JBL 2426J replacement-driver configuration clearly identified

Professionally serviced by HQaudios

Backed by our 1-Year HQaudios Warranty

PRODUCT OVERVIEW

The JBL 4343 is one of JBL's most recognizable large-format professional studio monitors. Introduced during the 1970s, the 4343 combines four dedicated driver sections in a substantial bass-reflex cabinet designed for wide-range music reproduction and the demanding listening environments of professional control rooms.

The original JBL 4343 architecture combines a 15-inch 2231A low-frequency woofer, a 10-inch 2121 mid-bass driver, a horn-loaded compression-driver section with acoustic lens, and a 2405 ultra-high-frequency slot radiator.

This particular set has been updated by HQaudios with JBL 2426J high-frequency compression drivers, replacing the previously installed JBL 2420 drivers. The 2426J incorporates a 44 mm pure-titanium diaphragm, a 1-inch horn throat, and 16-ohm nominal impedance.

The 2426J is a JBL professional compression driver with a titanium diaphragm and a design suited to horn-loaded applications. This replacement represents a change to the high-frequency compression-driver configuration rather than the original factory-installed 2420 arrangement.

The familiar JBL 4343 four-way configuration, horn and acoustic-lens arrangement, front-panel frequency controls, internal/external crossover selection and distinctive cabinet design remain central to the system.

Visually, these monitors feature warm walnut veneer cabinets, blue front baffles, the distinctive JBL horn/acoustic-lens assemblies and large-format driver layout associated with the classic 43-series monitors.

HQAUDIOS RESTORATION & TESTING

Before Driver Replacement

This JBL 4343 set previously used JBL 2420 compression drivers in its horn-loaded high-frequency sections.

The JBL 4343 four-way system also incorporates separate low-frequency, mid-bass and ultra-high-frequency driver sections, front-panel frequency adjustments and rear crossover-configuration controls.

During Service & Driver Replacement

Our HQaudios team removed the previously installed JBL 2420 compression drivers and fitted JBL 2426J compression drivers in their place.

High-Frequency Driver Replacement: The earlier compression-driver units were replaced with JBL 2426J models, updating the horn-loaded high-frequency driver configuration.

JBL 2426J Configuration: The replacement drivers use 16-ohm nominal impedance and 44 mm titanium diaphragms with a 25 mm horn throat.

Horn & Acoustic-Lens System: The monitors retain their JBL horn-loaded layout with acoustic lenses positioned in front of the compression-driver sections.

Four-Way Architecture: The 15-inch low-frequency, 10-inch mid-bass and 2405 ultra-high-frequency sections remain part of the JBL 4343 design.

Cabinet Presentation: The large walnut veneer enclosures and classic blue front-baffle styling remain part of the monitors' vintage appearance.

After Driver Replacement

The monitors now feature JBL 2426J titanium-diaphragm compression drivers in place of the previously installed 2420 models.

Compression-Driver Configuration: JBL 2426J drivers are installed in both horn-loaded high-frequency sections.

Horn Arrangement: The compression-driver sections remain integrated with the JBL horn and acoustic-lens arrangement.

System Architecture: The JBL 4343 continues to use its four-way speaker design with separate low-frequency, mid-bass, horn-loaded and ultra-high-frequency sections.

Final Configuration: A classic JBL 4343 professional studio monitor system updated with JBL 2426J compression drivers.

CONDITION

Technical Condition

15-Inch Low-Frequency Sections: The JBL 2231A low-frequency configuration remains part of the four-way monitor system. The large woofer assemblies are fitted in the bass-reflex enclosures and retain their dedicated low-frequency role.

10-Inch Mid-Bass Sections: The JBL 2121 mid-bass driver configuration remains in place, providing the dedicated cone-driver section between the low-frequency woofer and horn-loaded upper-midrange system.

JBL 2426J Compression Drivers: The previous JBL 2420 units have been replaced with JBL 2426J titanium-diaphragm compression drivers. Both horn-loaded sections now use the 16-ohm 2426J configuration.

Horn & Acoustic Lenses: The horn-loaded sections retain the JBL 2307 horn and 2308 acoustic-lens arrangement associated with the 4343 design.

JBL 2405 Ultra-High-Frequency Sections: The slot-radiator units remain part of the four-way monitor configuration and are positioned in the upper-frequency section of each cabinet.

Front-Panel Controls: The frequency-level adjustment controls remain fitted to the front baffles and retain the original-style JBL 4343 control layout.

Crossover & Rear Connections: The monitors retain the JBL 4343 internal passive / external crossover configuration design, including the rear connection and selection-panel arrangement. External multi-amplifier operation requires suitable crossover equipment and correct configuration.

Cosmetic Condition

Cabinets: Large walnut veneer enclosures with warm wood-grain surfaces and the substantial proportions of JBL's classic professional monitors. Minor vintage surface wear remains visible in the photographs.

Front Baffles: Classic blue front panels featuring the four-way driver arrangement, horn and acoustic-lens assemblies, bass-reflex ports and frequency-level control panels.

15-Inch Woofers: Large low-frequency cone assemblies, black surrounds and mounting hardware are visible within the blue front baffles.

10-Inch Mid-Bass Drivers: Dedicated cone-driver assemblies positioned above the large woofers, with the visible cones, surrounds and mounting areas retaining a vintage appearance.

Horns & Acoustic Lenses: Black horizontal acoustic-lens assemblies are fitted in front of the horn-loaded compression-driver sections.

JBL 2405 Slot Tweeters: Ultra-high-frequency slot-radiator units are positioned within the front-baffle driver layout.

Controls & Labels: Front-panel frequency-adjustment knobs, identification markings and associated trim remain part of the classic 4343 presentation.

Rear Panels: Rear cabinet surfaces include the JBL connection and crossover-configuration assemblies, with vintage hardware and identification markings.

Overall Appearance: A well-presented vintage JBL 4343 monitor set featuring walnut cabinetry and blue baffles. Minor age-related cosmetic marks remain, as shown in the actual photographs.

JBL 2426J Driver Installation Completed

Horn / Acoustic-Lens Configuration Retained

Four-Way Monitor Configuration Updated

SPECIFICATIONS

Brand: JBL

Model: 4343 Studio Monitor

Type: 4-Way, 4-Driver Professional Studio Monitor

Enclosure: Bass Reflex

Low-Frequency Driver: JBL 2231A - 15 inches / 380 mm

Mid-Bass Driver: JBL 2121 - 10 inches / 250 mm

Installed Compression Driver: JBL 2426J

Compression Driver Nominal Impedance: 16 Ohms

Compression Driver Diaphragm: 44 mm Pure Titanium

Compression Driver Horn Throat: 1 inch / 25 mm

JBL 2426J Factory Frequency Range: 500 Hz - 20 kHz

Horn / Acoustic Lens: JBL 2307 / 2308

Ultra-High-Frequency Driver: JBL 2405 Slot Radiator

Factory System Nominal Impedance: 8 Ohms

JBL 4343 Factory Crossover Frequencies: 300 Hz / 1.25 kHz / 9.5 kHz

Network Configuration: Internal Passive Network / External Crossover Mode

Factory Cabinet Dimensions: Approximately 41.4 H x 25 W x 17.1 D inches (1051 x 635 x 435 mm), per speaker

Factory Cabinet Weight: Approximately 175 lbs / 79 kg per speaker

Cabinet Appearance: Walnut Veneer / Blue Front Baffles

Connectivity: Wired Speaker Terminals

WHAT IS INCLUDED

2 JBL 4343 Professional Studio Monitor Speakers

2 Installed JBL 2426J Compression Drivers

Installed Horn & Acoustic-Lens Assemblies

The compression drivers and horn assemblies listed above are installed components of the speakers, not separate additional accessories.

Speaker stands / wooden bases used for display are not included. External crossovers, amplifiers, cables and other audio equipment 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.