Speaker & Subwoofer Test
Tones, Sweeps & Bass Test
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Polarity A/B on Tests: 100 Hz, three rounds of in-phase then inverted. B quieter means the pair is wired correctly.
Test any speaker the right way. Speaker & Subwoofer Test plays clean, accurate audio so you can check headphones, phone speakers, soundbars, car audio and home subwoofers — and hear exactly what's working and what isn't.
Whether you're dialing in a new setup, hunting a buzz in the dash, or making sure both channels actually play, this app gives you the test signals the pros use.
WHAT YOU GET
• Tone generator — play a steady, pure tone at any frequency from deep bass to high treble, with adjustable level.
• Frequency sweep — glide smoothly from low to high to reveal weak spots, rattles, resonances and the true limits of your speakers.
• Left/right channel test — confirm stereo wiring and balance by sending sound to one side at a time, so you know which speaker is which.
• Polarity & phase check — make sure your speakers and subwoofer are wired in phase for tight, full bass instead of thin, hollow sound.
• Bass & subwoofer test — push low frequencies to find the lowest note your sub can really reproduce and check for distortion or port noise.
WHO IT'S FOR
Car audio installers and enthusiasts, home theater and hi-fi owners, DJs and musicians, studio and AV technicians, and anyone setting up new speakers or headphones who wants to find rattles, fix wiring mistakes, and get clean, balanced sound.
HOW TO USE IT
Start with the left/right test to confirm wiring, run a sweep to listen for rattles and buzzes, then use polarity and bass tests to lock in tight low end. Use moderate volume — test tones can be loud and may stress drivers at high levels.
A NOTE ON SAFETY
Protect your hearing and your gear. Begin at low volume and raise it gradually. Sustained loud tones can damage speakers, headphones and your ears.
Ratings & Reviews
Polarity A/B check.
Verify: Tests tab, tap Polarity A/B. The meter holds 100 Hz while the line under it alternates A · In phase and B · Inverted, three rounds, 13.5 s. On a correctly wired stereo pair B is clearly quieter than A. If B is as loud as A or louder, one speaker's + and - are swapped. A single phone or mono Bluetooth speaker goes silent on B — that is normal; see Guide step 5. Play Right Channel first if you only have one speaker; silence there means this test does not apply.
The developer, heekyung moon, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- heekyung moon
- Size
- 54.2 MB
- Category
- Music
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
18+
- 18+
- Contains
Advertising
- Copyright
- © 2026 Moon