JL Audio CF-350MT Custom Fit Series 3.5" 9cm Mid-Tweeter Speaker System 35w RMS
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The JL Audio CF-350MT is a pair of 3.5" (90 mm) Custom Fit Series mid-tweeter speakers rated at 35W RMS, designed to drop into factory dashboard and trim locations with minimal modification.
Shallow polymer frames and breakaway mounting tabs help these speakers fit factory locations. Need a different size? The Custom Fit Series is also available in the JL Audio CF-275MT 2.75" mid-tweeter.
Key specifications
- Type: 3.5" (90 mm) mid-tweeter, sold as a pair
- Power handling: 35W RMS
- Recommended amplifier power: 10–50W RMS per channel
- Sensitivity: 86 dB @ 1W / 1m
- Impedance: 4 ohm
- Passive use: in-line second order high-pass filters included
- Grilles: built-in, low-profile perforated metal
Custom Fit (CF) Speaker System: CF-350MT 3.5" (90 mm) Mid-Tweeter
CF speakers are engineered to deliver improved sound from factory locations. Shallow polymer frames and breakaway mounting tabs maximise compatibility with popular vehicles including those from Chevrolet, GMC, Cadillac, Dodge, Jeep, RAM, Toyota and many more.
At the core of the CF-350MT is a proprietary 3.5" (90 mm) composite frame and a DMA-optimised motor system. An ultralight, fibre-reinforced pulp cone with a custom "S" roll surround delivers efficiency and extended high-frequency response. A flat, progressive-roll spider ensures linear compliance, while the neodymium motor provides strong output from an ultracompact, lightweight package. The glass-filled, high-temperature polymer frame features insert-moulded terminals and a low-profile perforated metal grille, suitable for fitting behind factory trim and offering UV protection in exposed dashboard locations.
For passive use as mid-treble speakers, in-line second order high-pass filters are included to improve smoothness and power handling. The CF-350MT can also be used actively as true midrange or mid-tweeter drivers in two-way or three-way systems. For active applications, JL Audio recommend a high-quality digital signal processor (DSP) such as the JL Audio TwK® DSP or a VXi amplifier with built-in DSP.
Speakers are sold as a pair and include built-in grilles.
Explore the full range in JL Audio Speakers.
Specification
| Continuous Power Handling (RMS) | 35 W |
|---|---|
| Recommended Amplifier Power (RMS) | 10 - 50 W / Ch. |
| System Efficiency | 86 dB @ 1 W / 1 m |
| System Nominal Impedance | 4 Ω |
| System Frequency Response | 450 Hz - 20 KHz ± 3 dB |
| Design Bandwidth | With 24 dB / octave filters: 400 Hz - 20 kHz; With 12 dB / octave filters: 500 Hz - 20 kHz |
What's Included
- CF-350MT Speakers are sold as a pair and include built-in grilles.
JL Audio
About the JL Audio CF-350MT
From our tech experts at CEN
A JL Audio CF Series mid-tweeter unit, 3.5 inch, handling 30w RMS.
Who it suits
Drivers building a multi-way active front stage, where each driver covers a defined band and a processor sets the crossover points. Custom Fit drivers are designed for tight factory locations where nothing standard will go.
Our tech experts advise
Drivers like this are part of a system rather than a straight swap: they assume amplification and processing, and the crossover points matter as much as the hardware. get in touch and we will help specify the whole front stage. See car audio installation.
Explore the full JL Audio range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all JL Audio
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Have it Fitted By Our Team
Our team fits car audio, stereos, dash cams and vehicle security at our workshop in Beeston, Nottingham. Tell us your vehicle and we'll confirm the parts and a fitted price.
- 1
Tell us your vehicle
Make, model and year, and what you'd like fitted.
- 2
We confirm the parts
Fascia, wiring and interfaces checked for your car, with a fitted price.
- 3
Fitted at our workshop
Bring it to our Beeston workshop and we do the rest.
Unit 25 Technology Drive, Beeston, Nottingham NG9 1LA
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Frequently Asked Questions
Q: Will these speakers fit my car?
A: Most car speakers are standard sizes, but mounting depth and fitting rings vary by vehicle. Check the size in the Specification tab against your vehicle, or contact CEN with your registration and we will confirm fitment and any adapters or fitting kits you need.
Q: Do I need an amplifier to run these speakers?
A: Not always. Most speakers will run from a standard head unit, but a dedicated amplifier lets them perform at their best, particularly for component sets and higher power handling models. The RMS figure in the Specification tab is the guide to how much clean power they can use.
Q: What is the difference between coaxial and component speakers?
A: Coaxial speakers combine the tweeter and woofer in one unit for a simple like-for-like upgrade. Component sets separate the tweeter and woofer with a crossover for better imaging and detail, and suit installs where sound quality is the priority.
Q: Do these come as a pair?
A: Unless stated otherwise, car speakers are sold in pairs. Check the product title and What's Included tab, which lists exactly what is in the box.
Q: Can CEN fit these speakers for me?
A: Yes. CEN offers professional installation from our Nottingham premises. Contact us to book an installation slot or ask for a fitting quote.
Q: Are the JL Audio CF-350MT speakers sold as a pair?
A: Yes. They are sold as a pair and include built-in grilles.
Q: Can the CF-350MT be used without a DSP?
A: Yes. For passive use as mid-treble speakers, in-line second order high-pass filters are included to enhance smoothness and improve power handling. They can also be run actively as true midrange or mid-tweeter drivers with a DSP, such as the JL Audio TwK DSP or a VXi amplifier with built-in DSP.
Q: Where are the CF-350MT speakers designed to fit?
A: They are designed for factory locations such as the dashboard, with shallow polymer frames, breakaway mounting tabs and a low-profile perforated metal grille that fits behind factory trim and gives UV protection in exposed dashboard positions.
Q: How much power can the CF-350MT handle?
A: JL Audio rates the 3.5 inch CF-350MT at 35W RMS continuous power handling, with a recommended amplifier power of 10 - 50W RMS per channel.
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