JBL 4425 Studio Monitor Speakers – Professionally Restored – Fully Tested – 1-Year Warranty

Professionally Restored by HQaudios – Fully Tested – Backed by Our 1-Year Warranty.

Up for sale is a stunning pair of the legendary JBL 4425 Studio Monitors. Introduced as part of JBL’s groundbreaking series that brought the revolutionary Bi-Radial horn technology to compact studio monitors, the 4425 is a masterpiece of acoustic engineering.

Featuring a robust 12-inch woofer paired with JBL’s iconic Bi-Radial horn and compression driver, this 2-way system delivers the immense dynamic range and transient speed of a horn speaker, but with an incredibly wide and consistent sweet spot. Enclosed in beautiful real walnut veneer cabinets with the classic blue baffles, the 4425 provides the perfect balance between clinical studio accuracy and thrilling musicality.

Whether you are setting up a high-end vintage listening room or seeking the ultimate dynamic speaker for your audio system, the JBL 4425 delivers a massive, uncompressed soundstage that brings the live performance directly to your seat.

Key Highlights

• Authentic JBL 4425 2-Way Studio Monitors
• 12-inch (300mm) Low-Frequency Woofer for Deep, Authoritative Bass (2214H)
• Iconic Bi-Radial Horn with Compression Driver (2416H)
• Exceptionally Wide and Even Constant-Directivity Dispersion
• Front-Panel Mid and High Frequency Level Controls
• Beautiful Real Walnut Veneer Cabinets with Blue Baffles
• Professionally Restored and Serviced by HQaudios
• Acoustically Calibrated
• Carefully Packed for Safe Shipping
• Backed by Our 1-Year HQaudios Warranty

Sound Character

The JBL 4425 is famous for delivering the “best of both worlds”: the visceral slam of a large JBL 12-inch woofer combined with the startling clarity and speed of a horn-loaded compression driver.

Unlike traditional horns that can sometimes sound “honky” or beam high frequencies into a narrow space, the Bi-Radial horn ensures constant directivity. This means you get a massive, highly detailed 3D soundstage and a huge sweet spot. Vocals, brass, and percussion are rendered with breathtaking live-concert realism without the listening fatigue often associated with older horn designs.

Down low, the front-ported 12-inch woofer provides bass that is incredibly punchy, articulate, and fast, easily keeping up with the speed of the horn. The result is a highly energetic, transparent, and immersive listening experience.

HQaudios Restoration & Testing Process

Drivers, Crossovers & Cabinets

The magic of the 4425 lies in the seamless acoustic integration between the highly advanced Bi-Radial horn and the heavy-duty 12-inch woofer. Maintaining the integrity of these components is crucial to preserving the speaker’s ruler-flat frequency response and legendary dispersion characteristics.

Because the acoustic integrity of these parts dictates the final sound, they receive particular attention throughout HQaudios’ restoration process. Whenever possible, close-up photographs of the Bi-Radial horns and freshly re-foamed drivers are included, and additional photos or videos are available upon request.

Specifications

What Is Included

Pair of JBL 4425 Studio Monitor Speakers.

Original speaker grilles as pictured.

Only the items clearly shown in the photos or specifically listed in the description are included.

Video Test & Sound Demo

We understand that purchasing vintage audio equipment online requires confidence, especially with highly dynamic studio monitors.

If you would like to see these JBL 4425s in operation before purchasing, please contact us through our website. Whenever available, we are happy to provide additional photos, close-up images, operational videos, or sound demonstrations.

You are also welcome to visit the HQaudios YouTube channel to explore restoration projects, product demonstrations, and listening sessions featuring professionally restored vintage audio equipment.

Suggested Pairing

Due to the efficiency of the horn and the high-current demands of the robust 12-inch woofer, the JBL 4425 is remarkably versatile. It pairs brilliantly with both muscular solid-state equipment and high-quality tube amplification.

Basic Use Guide

To help maintain the long-term performance of your vintage monitors, we recommend the following:

• Place the speakers on heavy, low speaker stands to elevate the Bi-Radial horns to ear level for the ultimate stereo imaging.
• Use high-quality, properly gauged speaker wire.
• Periodically rotate the high-frequency level control back and forth to keep the internal contacts clean and prevent oxidation.
• Avoid pushing your amplifier into “clipping” (distortion at high volumes), as this can easily damage the compression driver diaphragms.
• Contact us anytime if you need assistance with room placement, amplifier matching, or setup.

Trade-In Program

Do you have vintage audio equipment you’d like to trade in?

HQaudios welcomes trade-ins on receivers, amplifiers, speakers, cassette decks, reel-to-reel decks, turntables, and other classic audio components.

Simply send us photos and basic information about your equipment. Our team will gladly review your items and discuss available trade-in options.

Build Your Vintage System

Looking to build a complete vintage audio system?

The JBL 4425 pairs beautifully with professionally restored receivers, amplifiers, turntables, and tape decks available from HQaudios.

If you’re planning to purchase multiple components, ask us about available package pricing and complete system recommendations tailored to your listening preferences.

Shipping & Packaging

Vintage speakers of this size are heavy and require careful packing. This pair will be professionally packed with strong protection to help ensure safe delivery.

• Custom foam padding to protect the drivers and Bi-Radial horns.
• Corners and real wood veneer protected with heavy-duty edge guards.
• Strong, multi-layered boxing for each speaker individually.
• Tracking information provided after shipment.

Local pickup is also available and highly recommended by appointment.

1-Year HQaudios Warranty

This item is backed by our 1-Year HQaudios Warranty, covering proper electronic and functional operation under normal home use.

Our goal is to provide a confident and comfortable buying experience. If you have any questions after receiving your item, please contact us first through our website. We are here to help.

Warranty does not cover misuse, physical damage, blown voice coils or diaphragms due to amplifier clipping, unauthorized repair, or shipping damage after delivery.

Important Note for Buyers

Vintage speakers are acoustic instruments. They require proper room placement and capable amplification to sound their best. The 4425 rewards careful placement with one of the most holographic soundstages in vintage audio.

We do our best to describe each unit clearly and provide detailed photos so you can buy with confidence. Please review all photos, read the full description, and contact us with any questions before purchase.

HQaudios – Vintage Audio Restored with Care.
Professionally Restored • Fully Tested • Carefully Packed • 1-Year Warranty