SoundXtreme ST-694 6x9" 4-Way Coaxial Car Speakers

The SoundXtreme ST-694 is a pair of 6x9-inch, 4-way coaxial car speakers designed for replacing compatible factory speakers or completing an aftermarket audio upgrade. Each pair combines a full-size oval woofer with dedicated midrange and tweeter elements in a single speaker assembly. Its 4-ohm load is suited to car audio head units and compatible external amplifiers.

With 140 watts RMS handling per pair and 520 watts peak handling per pair, the ST-694 is intended for systems that need more output capability than many original-equipment speakers. The rated 92 dB sensitivity supports useful output from modest-power sources when the system is set up properly. Its 30 Hz to 20 kHz frequency-response rating is designed to cover bass, midrange, and high-frequency content from one coaxial location.

The 6x9-inch polypropylene woofer cone provides the primary low- and mid-frequency foundation, while the polyester foam surround supports cone movement. A 2-inch midrange and 1/2-inch PEI balanced-dome tweeter handle upper-frequency detail within the coaxial assembly. This layout makes the ST-694 a practical choice for listeners seeking a straightforward full-range speaker replacement.

SoundXtreme specifies an aluminum 1-inch voice coil and an Electric Crystal Motor tweeter magnet. The speakers use spade terminals for conventional speaker-wire connections. Protective grilles are included, providing an option for exposed or custom installations.

Before ordering, compare the vehicle's available mounting opening and rear clearance with the ST-694's published cutout and depth measurements. The speakers can be connected to a compatible head unit or amplifier, but clean power and correct polarity are important for proper operation. They can serve as a rear-deck, door, or custom-installation upgrade where the mounting dimensions and clearance are suitable.

Key Features

• 4-Way Coaxial Design: Integrates woofer, midrange, and tweeter elements into each speaker.
• 6x9-Inch Woofer: Provides an oval cone area for full-range car audio use.
• 140W RMS Per Pair: Supports sustained playback within the published pair rating.
• 4-Ohm Impedance: Matches many common car audio speaker outputs.
• Polypropylene Cone: Provides a durable woofer diaphragm material.
• PEI Balanced-Dome Tweeter: Handles high-frequency reproduction in the coaxial assembly.

Design & Installation

The ST-694 uses a polypropylene woofer cone, polyester foam woofer surround, PEI tweeter dome, and aluminum voice coil. Its coaxial layout places the midrange and tweeter components over the woofer, helping consolidate full-range reproduction into a 6x9-inch speaker location. Included grilles can help protect the speaker faces where clearance permits their use.

Verify the 5-5/8 x 8-7/16-inch mounting cutout, 3-3/16-inch bottom-mount depth, and 7/16-inch top-mount depth before installation. Connect positive and negative speaker leads to the corresponding spade terminals, and avoid operating the speakers at audible distortion. Disconnect the vehicle battery before electrical work and use mounting hardware suitable for the vehicle's speaker location.