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JBL 4425 Bi-Radial Studio Monitor Speakers – Walnut – Original Pair – Restored – 1-Year Warranty
$3,299
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- Authentic JBL 4425 Bi-Radial Studio Monitor Speakers
- 2-Way, 2-Driver Professional Studio Monitor design developed for demanding studio and audio-production applications.
- 12-inch JBL 2214H Low-Frequency Driver provides strong, controlled bass response and substantial low-frequency output.
- JBL 2416H Compression Driver uses a high-performance titanium diaphragm for efficient and detailed high-frequency reproduction.
- JBL 2342 Bi-Radial Horn provides controlled and wide sound dispersion with the characteristic JBL professional-monitor presentation.
- 40 Hz – 16 kHz Frequency Response ±3 dB provides a wide operating range for music monitoring and serious listening.
- 91 dB SPL Sensitivity allows the JBL 4425 to achieve strong acoustic output without requiring excessive amplifier power.
- 8 Ohms Nominal Impedance provides compatibility with a broad range of quality amplifiers.
- 200W Maximum Power Input provides substantial power-handling capability for a compact professional monitor.
- 1.2 kHz Crossover Frequency provides the transition between the 2214H low-frequency driver and 2416H compression-driver section.
- 100° × 100° Bi-Radial Dispersion provides broad and controlled coverage for studio and listening-room applications.
- Oiled Walnut Cabinet Finish preserves the classic professional JBL appearance.
- Dark Blue Front Grilles provide the distinctive appearance associated with the JBL 4425.
- Professionally Restored and Fully Tested by HQaudios before being approved for sale.
JBL 4425 Bi-Radial Studio Monitor Speakers
Professionally Restored by HQaudios – Fully Tested – Backed by Our 1-Year Warranty.
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 |
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.
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
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.
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.
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 |
HQaudios Recommended Room Size & Music
Recommended Room Size: Approx. 150–350 sq ft.
Recommended Music: Jazz • Rock • Blues • Vocals • Live Recordings • Acoustic • Studio Monitoring
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.
What Is Included
- One pair of JBL 4425 Bi-Radial Studio Monitor Speakers
- Dark blue front grilles – as pictured
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
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.
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.
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.
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