JL Audio ACP112LG-TW1 12TW1 MicroSub+™ Single 12" Subwoofer with 400W 0.25 Ohms, Class-D Amplified Loaded in a Slot-Ported Enclosure
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What's Inside?
- • 12" 12TW1 MicroSub Class-D Amplified Loaded in a Slot-Ported Enclosure
- • 30-amp ATO fuse (installed)
- • 12" Speaker level input harness
- • Black metal grille (installed)
- • Power connection plug (installed)
- • Owner's Manual
Why Choose JL Audio ACP112LG-TW1 Powered Subwoofer?
Direct Power Conversion
With MicroSub+™ systems, the power is built right into the subwoofer system. Housing a proprietary Class D amplifier, this incredible subwoofer system utilizes JL Audio's exclusive DCD™ amplifier technology to extract maximum output from its specially engineered, ultra low-impedance TW1 driver.
By combining direct power conversion with an ultra-high current output section, DCD™ amplifiers are free of conventional switching power supplies, enabling them to generate remarkable power with unprecedented efficiency.
Key to the enclosure’s performance is its efficient slot-ported design and precise tuning of its 12TW1 subwoofer driver. Extensive interior bracing permits the use of thinner wall material that maximizes the enclosure's internal volume relative to its exterior volume.
Low Tuning Frequency
The port wraps around two walls of the enclosure to produce the necessary low tuning frequency that ensures excellent extension and response smoothness. The flared port entry and exit further enhance sound quality by minimizing air-flow noises through the port.
Integration to OEM and aftermarket head units is a snap thanks to a variety of input options and automatic turn-on capability (via signal sensing or DC offset sensing). Also included is a variable frequency low-pass filter (50-200 Hz), along with output polarity control switch.
Adding an optional RBC-1 remote level control (sold separately) lets you control subwoofer levels directly from the driver’s seat. A quick-disconnect power connector makes it easy to remove the subwoofer when you need the extra space.
High-grade Automotive
As with all MicroSub™ systems, these amplified versions produce the kind of output and extension normally associated with much larger systems. Note: DCD™ amplified systems use very specific components. Never use a DCD™ amplifier or its companion subwoofer(s) with incompatible, non-DCD™ products.
Doing so will void the warranty and may cause severe damage. Finish: Black, high-grade automotive carpet with silver "JL AUDIO" embroidery on front baffle. A steel mesh grille is included to protect the subwoofer driver
Frequently Asked Questions (FAQ)
- • Why won't my JL Audio ACP112LG-TW1 produce any bass even though the power light is on?
Check the input signal, crossover settings, and speaker wiring. A disconnected RCA cable or incorrect input selection is a common cause.
- • Can I use the ACP112LG-TW1 with my factory infotainment system?
Yes. The built-in amplifier supports high-level speaker inputs for easy integration with most factory audio systems.
- • Why does the powered enclosure shut off during extended listening?
The amplifier may be overheating due to poor ventilation or entering protection because of low battery voltage.
- • Is the ACP112LG-TW1 suitable for hatchbacks and SUVs?
Yes. Its compact enclosure fits well in trunks, cargo areas, and many SUV applications.
- • Why does my bass sound muddy instead of tight?
The low-pass crossover or gain may be set too high. Adjusting both controls usually improves bass definition.
- • Can I mount the enclosure facing the rear seats?
Yes. The enclosure can be mounted in different orientations as long as it is securely fastened.
- • Why do I hear a clicking sound every time the amplifier powers on?
This is commonly caused by the remote turn-on circuit or an unstable power connection. Check all wiring and battery terminals.
- • Can I replace the built-in amplifier with a more powerful model?
While possible, the enclosure is engineered as a complete powered system, so modifications are not generally recommended.
- • Why doesn't the Auto Turn-On feature work with my aftermarket head unit?
Some radios do not output a strong enough signal for signal sensing. Using the remote turn-on wire provides the most reliable operation.
- • Will adding sound deadening improve the ACP112LG-TW1's bass performance?
Yes. Reducing vibrations in the trunk or cargo area often results in cleaner and more controlled bass response.
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Learn how to wire subwoofers

- Diameter : 12 Inch
- Impedance : 0.25 Ohm
Features:
- Powerful 12" Subwoofer: The ACP112LG-TW1 features a 12TW1 low-impedance subwoofer (0.25Ω) in a compact ported enclosure, perfect for vehicles with limited space.
- 400W RMS Class D Amplifier: Built-in amplifier delivers 400 watts RMS at 0.25 ohms with high efficiency (91–94%), producing deep, clean bass with minimal heat.
- JL Audio DCD Technology: Direct power conversion with ultra-high current output ensures maximum efficiency and performance.
- Ported Enclosure with Flared Slot Port: Side-firing port reduces turbulence and enhances bass fidelity.
- Durable Build: MDF cabinet covered in automotive-grade carpeting, with a black steel-mesh grille protecting the driver.
- Flexible Inputs: Accepts RCA line-level or speaker-level signals; includes 12" speaker-level input harness.
- Quick-Disconnect Terminal Block: Power, ground, and remote wires plug into a removable terminal block for easy removal or storage access.
- Remote Bass Ready: Optional JL Audio RBC-1 wired Remote Bass Control allows front-seat bass adjustments (sold separately).
- Customizable Controls: Variable input sensitivity, adjustable low-pass crossover (50–200 Hz, 12 dB/octave), turn-on mode selection, and phase switch (0°/180°).
- Thermal Protection: Built-in protection circuit shuts down amplifier in case of overheating.
Specifications:
- Subwoofer: 1 × 12TW1 low-impedance (0.25Ω)
- Enclosure Type: Ported
- Amplifier Type: Built-in Class D
- Power Output: 400 Watts RMS at 0.25 ohms
- Low-Pass Filter: 50–200 Hz, 12 dB/octave
- Woofer Material: Injection-Molded Poly
- Enclosure Material: MDF with automotive carpeting
- Inputs: RCA line-level and speaker-level
- Wiring Requirement: 8-Gauge Amp Kit (sold separately)
- Fuse Rating: 30A
- Dimensions: 23-3/4" W × 15-3/4" H × 9-1/4" D (10-1/4" D including grille)
- Condition: Brand New
- UPC: 699440933339
- Weight: 25
- Authorized Internet Dealer
Warranty: 2 Year(s) Warranty.
This item is accompanied by a manufacturer's warranty. If it is found to be defective, it may be returned to OnlineCarstereo.com for repair within 1 year from the original date of purchase with proper return authorization.
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This thing sounds like two 12’s. Very good product. I gave it an 8 because JL claims it can be installed without a line out converter. I ended up needing and LOC in my 2018 Yukon Denali. Other than that it’s amazing.
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Compact sub! The enclosure’s build quality is also pretty great. One the best powered subs I’ve ever owned.
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One of the best subwoofers I've ever owned if not the best. Both build and sound quality is truly top notch. Fits right well in my Cherokee. Might be more on the expensive side but I can say that this one best-value loaded enclosures in the market today! Hands down