Speaker & Subwoofer Test
Verify channel wiring, locate subwoofer frequency limits, test acoustic phase polarity, and eliminate cabinet rattles.
Left / Right Channel Separation
Verify stereo speaker wiring and channel orientation.
Click below to test individual channels. If clicking "Left Speaker" plays sound from your right speaker, your audio cables or speaker terminals are swapped.
Subwoofer Extension Ladder
Determine your subwoofer's low-end physical cutoff.
High-end subwoofers reach 20 Hz. Budget subwoofers roll off around 35-45 Hz. Bookshelf speakers usually stop at 50-60 Hz.
Speaker Phase & Polarity Diagnostic
Check if speaker wires are reversed (+ and - inverted).
When speakers are In-Phase (+ wired to +, - wired to -), both speaker cones move forward together. The sound feels tight, centered directly between your ears, and low-end bass is strong.
When Out-of-Phase (180°), one cone moves forward while the other moves backward. Sound waves cancel each other out in the middle of the room, creating a hollow, diffuse sound with almost zero bass.