KEF B139 Woofer Speaker Driver SP1044

( Brand: Kef ), ( Manufacturer Part Number: B139 ), ( Model: KEF B139 ), ( Type: Woofer Speaker ), ( Shape: Oval ), ( Connectivity: Wired ), ( Impedance: 8 Ohms ), ( Country Of Origin: United Kingdom )

Review KEF Oval Woofer Ohm Vintage Speaker Driver Tested Working England

The KEF B139 SP1044 woofer speaker driver is a high-performance component that delivers accurate and detailed mid-range sound for various audio applications. This 6.5-inch driver boasts several advanced technologies that ensure exceptional sonic quality and durability.

The woofer cone is made of KEF's proprietary Uni-Q matrix material. This lightweight and rigid material ensures excellent stiffness-to-weight ratio, allowing the cone to respond quickly and accurately to input signals. The cone's unique design, featuring a tangerine waveguide, helps to disperse the sound evenly in all directions, creating a wider, more immersive listening experience.

The KEF B139 SP1044 driver utilizes a powerful neodymium magnet system, which provides a strong magnetic field to move the cone efficiently. This results in increased power handling and improved dynamic range, allowing the driver to reproduce deep, powerful bass notes with ease.

The driver's voice coil is made of aluminum, which is an excellent heat conductor. This feature helps to dissipate heat generated during high-performance use, ensuring stable and consistent performance over long periods.

The KEF B139 SP1044 woofer speaker driver also features a vented pole piece design, which helps to reduce distortion and improve efficiency. The driver's termination is compatible with both 4- and 8-ohm speakers, making it a versatile option for various systems.

The driver's sturdy cast-aluminum basket provides rigidity and strength, reducing unwanted vibrations and ensuring accurate sound reproduction. The driver's mounting holes are also adjustable, allowing for precise alignment and secure installation in various enclosures.

Overall, the KEF B139 SP1044 woofer speaker driver is a high-performance component that delivers accurate, detailed, and powerful mid-range sound for a wide range of audio applications. Its advanced technologies, including Uni-Q cone design, powerful neodymium magnet system, and aluminum voice coil, make it a reliable and versatile option for audiophiles and professional sound engineers alike.

The KEF B139 SP1044 woofer speaker driver is a popular choice among audio enthusiasts due to its high-quality sound and advanced design. Here are some pros and cons that might help you make an informed decision about purchasing this woofer driver:

1. High-performance: The KEF B139 SP1044 woofer driver is known for its exceptional sound quality. It offers a wide frequency response range, high sensitivity, and low distortion, making it ideal for producing clear, detailed, and accurate sound.

2. Advanced design: This woofer driver features a unique Uni-Q design, which places the tweeter in the center of the woofer cone. This design helps to create a more natural and cohesive sound by minimizing the time difference between the sounds produced by the woofer and tweeter.

3. Durable construction: The KEF B139 SP1044 woofer driver is built to last. It has a robust aluminum cone and a strong magnet structure, which help to ensure that the driver can handle high power levels and withstand the rigors of regular use.

4. Versatile: This woofer driver can be used in a variety of applications, including home audio systems, studio monitors, and professional sound reinforcement systems.

1. Expensive: The KEF B139 SP1044 woofer driver is not an inexpensive option. It is priced at the higher end of the market, which may make it out of reach for some budget-conscious buyers.

2. Complex installation: Installing this woofer driver may require some technical expertise. It has a number of terminals and connectors, which can make the installation process more complicated than with some other drivers.

3. Size: The KEF B139 SP1044 woofer driver is larger than some other drivers on the market, which may make it more difficult to integrate into smaller systems or install in confined spaces.

The KEF B139 SP1044 woofer driver is a high-performance, advanced, and durable option for anyone looking for exceptional sound quality. Its unique Uni-Q design, wide frequency response range, and low distortion make it an ideal choice for audiophiles and professionals. However, its high price tag, complex installation process, and size may make it a less practical option for some buyers.

If you are looking for a high-quality woofer driver that offers exceptional sound performance, the KEF B139 SP1044 is an excellent choice. Its advanced design, durability, and versatility make it a worthwhile investment for anyone who is serious about audio. However, if you are on a tight budget or have limited space, you may want to consider other options that are more affordable or compact.

Details:

Cone is very clean with no cracks or tears. Strong output and sounds great. Very clean overall with only light cosmetic wear from age. Fully tested and working exactly as it should.

Desirable original KEF B139 SP1044 driver used in sought-after vintage British hi-fie systems and custom builds. Surround is in excellent shape with no deterioration. Frame is straight and terminals are solid. Ships securely packed.

Approximate dimensions: 11.5 x 8.5 overall, cone approximately 11 7. Please review photos for exact condition. Up for sale is a KEF B139 SP1044 oval woofer in fantastic condition.

part #: b139 prices

• $189.99-$4500.00

specifications shuspea:

• brand: Kef
• mpn: B139
• model: Kef B139
• type: Woofer Speaker
• shape: Oval
• connectivity: Wired
• impedance: 8 Ohms
• country of origin: United Kingdom

returns shuspea:

• policy: Returns Accepted
• time: 30 Days
• paid by: Buyer
• method: Money back

general shuspea:

• TV, Video Home Audio > Home Audio > Home Speakers Subwoofers
• condition: Used

offer shuspea:

• options: Ship-to-home
• started: March 27, 2026
• availability: In Stock
• sold: 0
• best offers: True
• quantity: 1

shipping shuspea:

• type: Fixed
• transit: 4-7 Days
• service: FedEx Ground / FedEx Home Delivery
• carrier: FedEx
• cost: $32.00
• class: Standard

payments shuspea:

• wallet: Google-pay
• credit card: Mastercard
• other

seller shuspea:

• rating: 99.4%
• city: Lake Oswego, Oregon
• # reviews: 1331

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