JBL 4310 Control Monitor
1968 – 1973
The JBL 4310 Control Monitor, introduced in 1968, is one of the most important studio monitors ever created. This compact three-way speaker became the standard by which all other studio monitors were judged throughout the 1970s and 1980s.
Overview
| Production | 1968–1970s |
|---|---|
| Type | Three-way studio monitor |
| Enclosure | Sealed (acoustic suspension) |
| Dimensions | 24.5" H × 14" W × 12" D |
| Weight | 45 lbs (20 kg) |
| Impedance | 8 ohms |
| Sensitivity | 91 dB (1W/1m) |
| Power Handling | 50 watts RMS |
| Crossover | 1,500 Hz and 7,000 Hz |
Driver Configuration
- Woofer: 10" JBL 123A-1 with white cone
- Midrange: 5" JBL LE5-2 phenolic ring radiator
- Tweeter: JBL LE25-4 1" dome tweeter
Historical Significance
The 4310 was designed to meet the needs of the growing number of small recording studios that couldn't accommodate large floorstanding monitors. Despite its compact size, the 4310 delivered:
- Flat frequency response for accurate mixing
- High sensitivity for uncompressed dynamics
- Wide dispersion for consistent monitoring positions
- Reliable, field-serviceable drivers
Evolution
The 4310 spawned an entire family of studio monitors:
- 4311: Updated version with improved woofer (123A-3)
- 4312: Further refinement with improved drivers
- L100 Century: Consumer version of the 4310 for home use
Studio Legacy
Countless hit records were mixed on 4310 monitors, including albums by:
- Steely Dan
- Queen
- Fleetwood Mac
- The Rolling Stones
The 4310's accurate, revealing character made it ideal for critical listening and mixing decisions.
Today
Vintage 4310 monitors are highly sought after by:
- Recording engineers seeking classic monitor sound
- Audiophiles who appreciate studio-grade accuracy
- Collectors of vintage JBL equipment
Well-maintained examples remain excellent monitors for both professional and home use.
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Service Manuals & Schematics
- Manual — archive.org
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)