JBL 4313B Control Monitor
1980 - 1983
The JBL 4313B Control Monitor represents the refined pinnacle of the 4313 series, incorporating evolutionary improvements that enhanced an already outstanding large-format monitor design. Introduced in 1980, the "B" version refined the crossover network and driver complement that had made the 4313 a favorite in professional studios requiring greater output capability than compact monitors could provide.
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 4313B emerged from JBL's ongoing commitment to refining their professional monitor lineup based on extensive field experience. While the original 4313 had established itself as a capable mid-field monitor, the "B" revision addressed specific areas where improvements could yield meaningful performance gains:
- 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 during an era of significant change in recording technology. Digital recording was beginning to emerge, and engineers needed monitors capable of revealing the new format's strengths while remaining compatible with analog production workflows. The 4313B's refined character made it well-suited to this transitional period.
The lowered crossover frequencies (1,000 Hz and 4,000 Hz versus 800 Hz and 5,000 Hz in earlier versions) represented a thoughtful rethinking of driver responsibilities. By reducing the midrange driver's bandwidth, JBL engineers achieved lower distortion in the critical vocal range while the refined tweeter comfortably handled the extended high-frequency duties.
Sound Character
The 4313B delivers a commanding yet refined sonic presentation that builds upon the 4313's strengths:
- 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 offers a slightly more forward and detailed midrange presentation. The lowered crossover points place less demand on individual drivers, resulting in lower distortion and improved clarity across the frequency spectrum.
The 4313B excels in mid-field monitoring applications where its greater output capability and extended bass response provide tangible benefits over smaller monitors. It fills the gap between compact nearfield monitors and massive main monitors, offering a practical solution for medium-sized control rooms.
Studio Applications
The 4313B found its niche 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
The 4313B is highly regarded among vintage JBL enthusiasts:
- 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 4313B can be distinguished from earlier 4313 models by its driver complement and crossover characteristics. The LE5-12 midrange and LE25-4 tweeter are specific identifiers.
Listening Tips: The 4313B requires adequate space to perform optimally. Allow at least 18 inches from rear walls for proper bass response. Quality amplification with good current delivery is essential to realize the monitor's dynamic capabilities.
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The 4313B represents JBL's dedication to continuous improvement in their professional monitor lineup. By thoughtfully refining the already capable 4313 platform, engineers created a monitor that offered genuine performance advantages while maintaining the reliability and sonic character that professionals depended upon. For collectors seeking a vintage monitor with substantial output capability and refined performance, the 4313B offers a compelling combination of professional pedigree and enduring sonic excellence.
Related Models
- JBL 4310 (1970)
- JBL 4315 Control Monitor (1977)
- JBL L110A (1975)
- JBL 4311B (1975)
- JBL 4408 (1975)
- Akai AM-2850 (1975)
- Akai AP-206 (1975)
- Nakamichi BX-1 (1985)
- Acoustic Research research-ar-17 (1978)
- Acoustic Research AR-19 (1994)