Speaker Polarity / Phase Tester FH168 — Safe, fast troubleshooting for car and home audio systems Key benefits Quickly identify speaker polarity and phase issues to prevent weak or canceled sound, especially in multispeaker setups. Reduce time spent diagnosing audio problems by confirming correct wiring and speaker orientation before installation. Protect equipment and speakers by testing without applying full system power or risking damage during adjustments. What it does Tests speaker polarity and phase to verify correct +/– connections and speaker phase relationships. Works with a wide range of speakers found in cars and audio systems, including tweeters, door speakers, midranges and subwoofers. Designed for safe troubleshooting and routine checks of audio systems. Why customers need it Ensures accurate sound imaging and fullfrequency performance by detecting reversed wiring or outofphase speakers. Helps installers and hobbyists confirm correct wiring during upgrades, repairs, or system builds. Useful for quick checks when investigating weak bass, hollow sound, or inconsistent stereo imaging. Important attributes Function: Speaker polarity and phase verification (polarity tester / phase meter). Model: FH168. Compatibility: Suitable for testing all common car speakers and most audio speakers including small treble units, door speakers, and subwoofers. Safety and ease: Intended for safe troubleshooting and testing of audio systems without risking component damage. Typical applications Car stereo installation: Verify speaker wiring and phase before final assembly to avoid canceled bass or poor stereo imaging. System troubleshooting: Diagnose whether poor sound is caused by reversed polarity or outofphase speakers. Multispeaker tuning: Check phase relationships across front, rear and subwoofer channels during system setup or upgrades. Simple use cases After installing a amplifier or replacing speakers, use the FH168 to confirm each speaker's polarity so the system reproduces bass and stereo imaging correctly. When a vehicle owner reports weak bass, test the subwoofer and door speakers to determine whether wiring polarity or phase alignment is the cause. During tuning of a multidriver system, verify that tweeters and woofers are in phase to maintain accurate transient response and soundstage. What you can expect Clear, reliable indication of speaker polarity and relative phase to support correct wiring and system performance. Broad applicability across automotive and general audio speaker types, helping both professionals and DIY users diagnose and verify audio installations. Usage note Follow common safety precautions when working with vehicle or home audio systems. Use the FH168 as part of a systematic check of wiring and speaker connections to ensure consistent, accurate results.