Introduction
The Infinity Kappa Perfect 300m is a 3.5-inch midrange speaker designed for high-performance car audio systems. This component is engineered to integrate into existing 2-way systems, allowing for an upgrade to a 3-way configuration by adding this dedicated midrange speaker. As part of Infinity's Kappa Perfect series, it is built for precise audio reproduction and robust construction, aiming to deliver clear and detailed midrange frequencies within your vehicle's sound system.
What's in the Box
- Two (2) Infinity Kappa Perfect 300m 3.5-inch Midrange Speakers
- Mounting hardware
- Owner’s manual

Image: The retail packaging for the Infinity Kappa Perfect 300m speakers, showing one speaker and the "Plus One™ woofer cone" feature.
Setup and Installation
Proper installation is crucial for optimal performance and safety. It is highly recommended that installation be performed by a qualified professional car audio installer. Incorrect wiring or mounting can damage the speakers, your vehicle's electrical system, or cause personal injury.
Safety Precautions
- Always disconnect the vehicle's battery negative terminal before beginning any electrical work.
- Ensure all wiring is properly insulated and secured to prevent short circuits and damage.
- Wear appropriate safety gear, including eye protection, during installation.
- Verify speaker polarity before making final connections.
Mounting Considerations
The Kappa Perfect 300m speakers are designed for flush mounting. Ensure adequate depth and clearance are available at the chosen installation location. Refer to the "Specifications" section for detailed dimensions.

Image: Front view of the Infinity Kappa Perfect 300m midrange speaker, showcasing its carbon fiber woofer cone and sleek design.

Image: Side profile of the Infinity Kappa Perfect 300m speaker, illustrating its mounting depth and frame structure.
Wiring
Connect the speaker terminals to the appropriate outputs of your amplifier or crossover network. Pay close attention to positive (+) and negative (-) terminals to maintain correct audio phase. The speaker has an impedance of 3.5 Ohms. Ensure your amplifier is stable at this impedance. When connecting wires to the speaker terminals, apply gentle, firm pressure to secure the connection without overtightening, which can damage the terminals.

Image: The Infinity Kappa Perfect 300m midrange speaker shown alongside a separate tweeter, demonstrating its role in a multi-component audio system.
Operating Guidelines
The Kappa Perfect 300m speakers are designed to reproduce midrange frequencies (150 - 10,000 Hz) within your car audio system. They function as passive components, receiving amplified signals from your car amplifier, often routed through a crossover network to ensure they only receive the appropriate frequency range.
Power Handling
- RMS Power Handling: 37.5 watts per speaker (75 watts per pair)
- Peak Power Handling: 150 watts per speaker (300 watts per pair)
- Recommended Power Range: 45 - 75 watts RMS per channel
To prevent damage, ensure your amplifier's output power does not consistently exceed the speaker's RMS power handling. Operating within the recommended power range will provide the best sound quality and speaker longevity.
Maintenance
The Infinity Kappa Perfect 300m speakers require minimal maintenance to ensure long-term performance.
- Cleaning: Gently wipe the speaker grilles and surrounds with a soft, dry cloth. Avoid using harsh chemicals, solvents, or abrasive cleaners, as these can damage the speaker materials.
- Connections: Periodically check all wiring connections to ensure they are secure and free from corrosion. Loose connections can lead to signal loss or distortion.
- Environment: While designed for automotive use, avoid exposing the speakers to excessive moisture or extreme temperatures beyond normal vehicle operating conditions.
Troubleshooting
If you experience issues with your Kappa Perfect 300m speakers, consult the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from speaker |
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| Distorted or unclear sound |
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| Intermittent sound |
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If these steps do not resolve the issue, contact Infinity customer support or a certified car audio technician for further assistance.
Specifications
| Feature | Detail |
|---|---|
| Model Name | Perfect 300m |
| Speaker Type | Component Midrange Speaker |
| Speaker Size | 3.5 Inches |
| RMS Power Handling | 37.5 Watts (each) / 75 Watts (pair) |
| Peak Power Handling | 150 Watts (each) / 300 Watts (pair) |
| Recommended Power Range | 45 - 75 watts RMS per channel |
| Impedance | 3.5 Ohms |
| Frequency Response | 150 - 10,000 Hz |
| Sensitivity | 88dB |
| Woofer Cone Material | Plus One™ carbon fiber |
| Voice Coil | Oversized 1-inch |
| Product Dimensions (D x W x H) | 3.5"D x 3.5"W x 1.75"H |
| Item Weight | 2.78 Pounds |
| Color | Black |
| Included Components | 2 speakers, Mounting hardware, Owner’s manual |
Warranty Information
The Infinity Kappa Perfect 300m speakers are covered by a limited warranty. Specific terms and conditions of this warranty are detailed in the owner's manual included with your product. Please retain your proof of purchase for warranty claims. The warranty typically covers manufacturing defects and workmanship under normal use. It does not cover damage resulting from improper installation, abuse, accident, or unauthorized modifications.
Support
For technical assistance, product inquiries, or warranty service, please contact Infinity customer support. You can find contact information and additional resources on the official Infinity website or by referring to the contact details provided in your owner's manual.
Visit the Infinity Store for more products and information.