JBL 4313B Control Monitor

1980 - 1983

The JBL 4313B Control Monitor is the last of the 4313 series, with refinements to the crossover network and driver complement. Introduced in 1980, the "B" version went to professional studios that needed more output than compact monitors could give them.

Overview

Type	Three-way studio monitor
Enclosure	Bass reflex (ported)
Dimensions	28.5" H × 18.5" W × 14.5" D (724 × 470 × 368 mm)
Weight	69 lbs (31 kg)
Impedance	8 ohms
Sensitivity	93 dB (1W/1m)
Power Handling	100 watts RMS
Frequency Response	40 Hz - 18 kHz (±3dB)
Crossover Frequencies	1,000 Hz and 4,000 Hz

Driver Configuration

Woofer: 12" JBL 2213H with ferrite magnet and edgewound voice coil
Midrange: 5" JBL LE5-12 with phenolic ring radiator
Tweeter: JBL LE25-4 1" dome tweeter with ferrofluid cooling

History & Design Evolution

The original 4313 was already a capable mid-field monitor. JBL's "B" revision went after specific areas where changes could improve performance:

Crossover Redesign: The most significant change was a revised crossover network with lowered crossover points and improved phase response
Driver Updates: Implementation of the LE5-12 midrange and LE25-4 tweeter brought improved consistency and reliability
Power Handling: Enhanced thermal design allowed higher continuous SPL capability
Professional Refinements: Improved cabinet bracing and terminal connections for demanding studio environments

The 4313B arrived as digital recording was beginning to emerge. Engineers needed monitors that could reveal the new format while still fitting analog production workflows. The 4313B suited that transitional period.

The crossover frequencies dropped to 1,000 Hz and 4,000 Hz, versus 800 Hz and 5,000 Hz in earlier versions. That narrows the midrange driver's bandwidth, and JBL got lower distortion in the vocal range out of it. The refined tweeter handled the extended high-frequency duties.

Sound Character

The 4313B builds on the 4313's strengths with a commanding but refined sound:

Enhanced Midrange Purity - The revised crossover and LE5-12 combination yield exceptional clarity in vocal frequencies
Improved High-Frequency Smoothness - The LE25-4's refined ferrofluid cooling enables cleaner treble reproduction
Deep Authoritative Bass - The 12-inch woofer provides substantial low-frequency foundation with excellent control
Increased Dynamic Capability - Higher sensitivity and power handling enable greater output with reduced compression
Refined Imaging - Improved driver integration creates a more coherent and stable soundstage

Compared to the original 4313, the "B" version has a slightly more forward and detailed midrange. The lowered crossover points put less demand on each driver, which means lower distortion and better clarity across the frequency spectrum.

The 4313B does its best work in mid-field monitoring, where its greater output and extended bass response give it a real advantage over smaller monitors. It sits between compact nearfield monitors and massive main monitors, and it suits medium-sized control rooms.

Studio Applications

The 4313B found a place in several professional applications:

Mid-field Monitoring: Positioned 6-10 feet from the listening position for larger control rooms
Mastering Suites: Valued for its balanced presentation and extended frequency response
Broadcast Master Control: Used in television and radio facilities requiring higher output
Post-Production: Employed in film and video editing for accurate dialogue and effects monitoring

Technical Improvements

The 4313B incorporated several meaningful technical refinements:

Revised Crossover Topology: Lower crossover frequencies with improved phase alignment
Updated Driver Complement: LE5-12 midrange and LE25-4 tweeter with enhanced reliability
Improved Cabinet Construction: Enhanced internal bracing reduced resonances
Professional Connectivity: Heavy-duty binding posts designed for studio use

Collector's Notes

Vintage JBL enthusiasts hold the 4313B in high regard:

Relative Rarity: Shorter production run than some other 43xx models
Performance Advantage: Meaningful improvements over the original 4313
Build Quality: Professional-grade construction throughout
Modern Utility: Fully capable for contemporary studio or home use when properly restored

Common Issues to Check:

Ferrofluid condition in LE25-4 tweeters (may need replacement after decades)
Crossover capacitor condition (electrolytics should be replaced)
Woofer surround integrity (rubber surrounds generally age well)
L-pad controls for midrange and tweeter level adjustment
Cabinet structural integrity and veneer condition

Variant Notes: The driver complement and crossover characteristics separate the 4313B from earlier 4313 models. The LE5-12 midrange and LE25-4 tweeter are the specific identifiers.

Listening Tips: The 4313B needs adequate space. Leave at least 18 inches from rear walls for proper bass response. It also needs quality amplification with good current delivery to get the full dynamic capability out of the monitor.

Similar items on eBay

No exact JBL 4313B Control Monitor listings are live right now — these searches show current JBL and similar vintage audio gear on eBay:

Search JBL 4313B Control Monitor on eBay Browse JBL audio gear on eBay

As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.