JBL 4425 Bi-Radial Studio Monitors Pair – Walnut – Restored – 1-Year Warranty

JBL 4425 BI-RADIAL STUDIO MONITOR SPEAKERS

Original JBL Drivers – Fully Recapped – Woofers Refoamed – 1-Year HQaudios Warranty

1. QUICK BUYER SUMMARY

Model: JBL 4425
Type: 2-Way Professional Studio Monitor Pair
Drivers: Original JBL 2214H + 2416H / 2342 Bi-Radial Horn
Impedance: 8 Ohms Nominal
Sensitivity: 91 dB SPL / 1W / 1m
Frequency Response: 40Hz–16kHz ±3dB
Restoration: Woofers Refoamed • Crossovers Fully Recapped • Controls Serviced • Fully Tested
Finish: Oiled Walnut / Dark Blue Grilles
Warranty: 1-Year HQaudios Warranty

2. WHY THE JBL 4425 STANDS OUT

The JBL 4425 is a compact professional studio monitor from the mid-1980s, combining a 12-inch woofer with a compression driver and Bi-Radial horn.

Its design delivers high sensitivity, controlled dispersion, strong bass output, and the direct presentation associated with classic JBL professional monitors.

3. HQAUDIOS RESTORATION & MULTI-POINT QUALITY CONTROL

Original Drivers Preserved • Fully Recapped • Woofers Refoamed • Fully Tested

BEFORE RESTORATION

The pair was inspected mechanically, electrically, acoustically, and cosmetically.

Woofer cones, surrounds, spiders, compression drivers, horns, crossover networks, controls, and terminals were checked for condition and proper operation.

Driver DC resistance was measured as a continuity and consistency check; these readings were not treated as nominal impedance values.

DURING RESTORATION

Both original JBL 2214H woofers were professionally refoamed, retaining the original cones, voice coils, frames, and motor structures.

The original crossover/network boards were fully recapped with new capacitors while preserving the original JBL circuit architecture, inductors, resistors, and wiring layout.

The original 2416H compression drivers, 2342 horns, Mid Frequency and High Frequency controls, and rear terminals were retained, cleaned, inspected, and serviced as required.

The walnut cabinets and dark blue grilles were cleaned and detailed.

AFTER RESTORATION

Frequency response was checked with an RTA and calibrated sound-card setup to confirm balanced operation and close consistency between the two speakers.

Driver polarity was verified separately, and both level controls were checked through their operating ranges.

The pair then underwent an extended listening test to confirm dynamics, tonal balance, stereo imaging, and operational stability.

• Original JBL Drivers Retained
• Woofers Refoamed
• Crossovers Fully Recapped
• Controls Serviced
• RTA Checked
• Final Listening Test

4. LISTENING CHARACTER

The JBL 4425 is known for a dynamic, direct presentation with strong bass authority and broad controlled dispersion.

The 2214H woofer delivers punch and scale, while the 2416H / 2342 horn section provides clear, projecting mids and highs.

It is especially well suited to jazz, rock, blues, vocals, live recordings, acoustic music, and studio-monitoring applications.

5. ACTUAL COSMETIC CONDITION

This pair presents well overall for its age.

The walnut cabinets, dark blue grilles, horns, drivers, corners, and rear panels have been cleaned and detailed while preserving their vintage character.

Please review all listing photos closely for the exact cosmetic condition and any age-related marks visible in the photographs.

6. FACTORY SPECIFICATIONS

Model: JBL 4425 Bi-Radial Studio Monitor
Type: 2-Way Professional Studio Monitor
Era: Mid-1980s / Circa 1985
Low Frequency Driver: JBL 2214H 12-inch Woofer
High Frequency Driver: JBL 2416H Compression Driver
Horn: JBL 2342 Bi-Radial Horn
Nominal Impedance: 8 Ohms
Minimum Impedance: Greater than 6 Ohms
Power Handling: 200W Maximum / Continuous Program per JBL Specification
Frequency Response: 40Hz–16kHz ±3dB
Sensitivity: 91 dB SPL / 1W / 1m
Crossover: 1.2kHz
Dispersion: Approx. 100° H × 100° V
Controls: Mid Frequency / High Frequency Level Controls
Finish: Oiled Walnut
Grille: Dark Blue
Dimensions: Approx. 25 H × 16 W × 12¼ D inches each; approx. 14¾ D including horn
Weight: Approx. 57 lbs net each

7. HQAUDIOS RECOMMENDED ROOM SIZE & MUSIC

Recommended Room Size: Approx. 150–350 sq ft

Recommended Music: Jazz • Rock • Blues • Vocals • Live Recordings • Acoustic • Studio Monitoring

8. AMPLIFIER & SYSTEM COMPATIBILITY

With an 8-ohm nominal impedance and 91dB sensitivity, the JBL 4425 is compatible with a wide range of quality vintage and modern amplifiers.

Use a clean, stable amplifier with adequate headroom and avoid sustained clipping.

9. WHAT IS INCLUDED

• One pair of JBL 4425 Bi-Radial Studio Monitor Speakers
• Dark blue front grilles – as pictured

10. VIDEO TEST & BUYER SERVICES

• Additional photos or operational video may be available upon request
• Amplifier and system-matching guidance is available before purchase
• Multi-item discounts and selected vintage-audio trade-ins may be available

11. SHIPPING & PACKAGING

Each JBL 4425 weighs approximately 57 lbs net and will be individually protected with extra attention around the walnut cabinet, dark blue grille, Bi-Radial horn, driver area, cabinet corners, and rear terminals.

12. 1-YEAR HQAUDIOS WARRANTY

This JBL 4425 speaker pair is covered by our 1-Year HQaudios Warranty for qualifying functional issues under normal home use.

Coverage does not include misuse, physical damage, incorrect amplifier connection, sustained clipping, unauthorized repair, incorrect wiring, incompatible equipment, or cosmetic wear.

13. BUY WITH CONFIDENCE

Please review the complete description and all product photos before purchase.

Contact HQaudios if you need clarification regarding condition, amplifier matching, shipping, or warranty coverage.

HQaudios – Vintage Audio Restored with Care.