STX Audio STX-650C 6.5" 2-Way Component Speakers

The STX Audio STX-650C is a 6.5-inch, 2-way car audio component speaker system designed as an upgrade from factory-installed speakers. It uses separate woofers, tweeters, and crossover networks to divide the audio signal between the drivers. This format is suited to vehicles with compatible 6.5-inch door or rear-deck speaker locations and separate tweeter mounting provisions.

The system is rated at 90 watts RMS per speaker, or 180 watts RMS for the pair. Published marketplace information also lists 325 watts maximum per speaker and 650 watts maximum for the pair. Its 4-ohm impedance is commonly compatible with aftermarket multichannel amplifiers and many factory speaker circuits.

The STX-650C combines a polypropylene-based woofer design with 1-inch balanced-dome tweeters. Published listings describe an IMPP cone with a carbon-fiber finish and butyl rubber surround, while also identifying an injection-molded polypropylene woofer and treated woven-cloth surround. Because these material descriptions vary between available listings, confirm the contents and finish of the specific package before installation.

A separate 2-way crossover network is included in the published product details to route appropriate frequency ranges to the woofer and tweeter. The crossover is described as having a 12 dB-per-octave roll-off and ferro-fluid cooling. Surface- and flush-mount hardware is listed for the tweeters, offering flexibility when choosing their final location.

This component set can be used with a factory head unit or paired with a multichannel amplifier as part of a larger vehicle-audio upgrade. One listing recommends an amplifier rated at least 700 watts to maximize the system, though amplifier selection should also be based on stable power output at the speakers' 4-ohm load. Match mounting dimensions, wiring routes, crossover placement, and vehicle-specific adapters before purchasing.

Key Features

• 6.5-Inch Component System: Separate drivers and crossovers support a more flexible installation layout.
• 180-Watt RMS Pair Rating: Provides a published continuous-power rating for amplifier matching.
• 4-Ohm Impedance: Fits common aftermarket car-audio amplifier configurations.
• 1-Inch Dome Tweeters: Dedicated high-frequency drivers handle upper-range reproduction.
• Included 2-Way Crossovers: Direct frequencies to the appropriate woofer and tweeter.
• Flexible Tweeter Mounting: Included hardware supports surface or flush installation.

Design & Installation

Published product details identify a 6.5-inch woofer with a polypropylene-based cone construction and a 1-inch balanced-dome tweeter. The system is also listed with aluminum voice coils, an 8-ounce magnet, ferro-fluid cooling, and transparent 2-way crossover housings. Marketplace descriptions differ on certain woofer-cone and surround materials, so package contents should be verified before ordering.

Install the woofers in compatible 6.5-inch speaker openings and mount the tweeters using the supplied surface- or flush-mount hardware where appropriate. Place each crossover in a protected, dry location and wire it between the amplifier or head-unit output and its corresponding woofer and tweeter. Verify vehicle fitment, polarity, mounting depth, and available space for the crossover modules before beginning installation.