What is the power rating of the Celestion CF1840JD?

The driver is capable of handling 1200 watts of continuous power. This makes it suitable for high-output professional audio applications.

What is the nominal impedance of this driver?

The CF1840JD has a nominal impedance of 8 ohms. This is a standard specification for professional PA components, allowing for flexible wiring configurations.

What is the frequency response range?

The driver provides a frequency range from 30Hz to 2500Hz. It is specifically designed to cover the low to low-mid spectrum.

What material is used for the cone?

The driver features a carbon-fibre loaded paper cone. This construction offers increased rigidity and durability compared to standard paper cones.

What type of chassis does the CF1840JD use?

It is constructed with a lightweight cast aluminium chassis. This design provides structural integrity while ensuring minimal interference with the magnet.

What type of magnet is used in this driver?

The CF1840JD utilises a ferrite magnet. Ferrite is a common and reliable material for high-power subwoofer drivers.

Is this driver suitable for full-range speaker cabinets?

While it can reach up to 2500Hz, it is designed specifically for subwoofers. It is best used for low-frequency reproduction in multi-way systems.

How does the carbon-fibre loading benefit the sound?

The carbon fibre strengthens the cone, allowing for incredibly deep bass responses. This helps maintain clarity and prevent cone deformation at high volumes.

What is the diameter of the driver?

The CF1840JD is an 18-inch (457mm) low-frequency driver. This large diameter is standard for professional-grade subwoofers.

Can this driver be used in large venues?

Yes, it is specifically designed to fill large venues with deep bass. Its high power handling and large cone area make it ideal for high-SPL environments.

Is the CF1840JD an active or passive component?

It is a passive raw driver component. It requires an external enclosure and a power amplifier to function.

What is the typical price for this driver?

The typical price range for the Celestion CF1840JD is approximately GBP 259. Prices may vary slightly depending on the retailer.

Gear article

Celestion CF1840JD 18" Low Frequency Subwoofer Driver

The Celestion CF1840JD is an 18-inch low-frequency driver designed specifically for professional PA subwoofer applications. It features an 8-ohm nominal impedance and is capable of handling 1200 watts of continuous power, utilising a carbon-fibre loaded paper cone for enhanced structural rigidity.

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Overview

The Celestion CF1840JD is a high-performance subwoofer component designed for integration into professional sound reinforcement systems. As a dedicated low-frequency transducer, it is engineered to deliver high-output bass responses in large-scale environments. The unit is typically priced around £259, positioning it as a professional-grade replacement or custom-build driver for high-SPL applications.

Design and Construction

The driver is built around a lightweight cast aluminium chassis, which provides significant structural integrity without adding excessive weight. This material choice also ensures minimal magnetic interference with the large ferrite magnet assembly. A defining feature of the CF1840JD is its carbon-fibre loaded paper cone. The inclusion of carbon fibre reinforces the paper, allowing the cone to maintain its shape under the intense mechanical stress of 1200-watt power handling, thereby reducing distortion at high volumes.

Technical Performance

Operating within a frequency range of 30Hz to 2500Hz, the CF1840JD is optimised for the lowest octaves of the audible spectrum. Its 8-ohm impedance makes it compatible with a wide variety of professional power amplifiers. The driver is capable of handling 1200 watts of continuous power, providing the thermal and mechanical headroom required for sustained use in demanding live sound or club environments.

Sound Character and Application

The CF1840JD is characterised by its ability to produce deep, impactful bass that can effectively fill large venues. Because of its narrow frequency range and high power handling, it is ideally suited for dedicated subwoofer enclosures rather than full-range cabinets. It is frequently employed by sound engineers looking to achieve a 'big' low-end foundation for modern music styles that demand significant sub-bass presence.

Comparative Context

While active subwoofers like the QSC KLA181 provide a complete, powered solution, the CF1840JD offers a component-level choice for those building or repairing passive systems. Compared to smaller drivers found in units like the SubZero P15X (15") or the AVCOM 8" Active Subwoofer, the CF1840JD's 18-inch diameter and carbon-fibre construction allow for greater air displacement and lower frequency extension, essential for professional touring and permanent installations.

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Frequently asked questions

What is the power rating of the Celestion CF1840JD?: The driver is capable of handling 1200 watts of continuous power. This makes it suitable for high-output professional audio applications.
What is the nominal impedance of this driver?: The CF1840JD has a nominal impedance of 8 ohms. This is a standard specification for professional PA components, allowing for flexible wiring configurations.
What is the frequency response range?: The driver provides a frequency range from 30Hz to 2500Hz. It is specifically designed to cover the low to low-mid spectrum.
What material is used for the cone?: The driver features a carbon-fibre loaded paper cone. This construction offers increased rigidity and durability compared to standard paper cones.
What type of chassis does the CF1840JD use?: It is constructed with a lightweight cast aluminium chassis. This design provides structural integrity while ensuring minimal interference with the magnet.
What type of magnet is used in this driver?: The CF1840JD utilises a ferrite magnet. Ferrite is a common and reliable material for high-power subwoofer drivers.
Is this driver suitable for full-range speaker cabinets?: While it can reach up to 2500Hz, it is designed specifically for subwoofers. It is best used for low-frequency reproduction in multi-way systems.
How does the carbon-fibre loading benefit the sound?: The carbon fibre strengthens the cone, allowing for incredibly deep bass responses. This helps maintain clarity and prevent cone deformation at high volumes.
What is the diameter of the driver?: The CF1840JD is an 18-inch (457mm) low-frequency driver. This large diameter is standard for professional-grade subwoofers.
Can this driver be used in large venues?: Yes, it is specifically designed to fill large venues with deep bass. Its high power handling and large cone area make it ideal for high-SPL environments.
Is the CF1840JD an active or passive component?: It is a passive raw driver component. It requires an external enclosure and a power amplifier to function.
What is the typical price for this driver?: The typical price range for the Celestion CF1840JD is approximately GBP 259. Prices may vary slightly depending on the retailer.