Speaker Test: Subwoofer & Bass
Left Right, Sweep & Tone Maker
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Find your subwoofer's real low limit: the new guided test steps down from 100 Hz to 15 Hz and keeps the lowest step you actually heard.
Speaker test for any speaker, soundbar, car stereo or subwoofer. Play clean test tones, sweep the whole range, check left and right, and find how low your sub really goes.
NEW: GUIDED SUBWOOFER TEST
The test steps down from 100 Hz to 15 Hz in 5 Hz steps. Each step plays on its own, and you answer only after it has actually played for 2 seconds: I hear a steady tone, Not sure (replay) or Can't hear. Near the edge it plays the step again to confirm. The result is the lowest step you heard on this speaker at this volume, not a grade. Buzzing, rattling or only feeling vibration counts as Can't hear.
QUICK SOUND CHECK
One tap on the home screen plays a 440 Hz tone for 5 seconds, so you know sound is coming out before you start.
TEST SIGNALS
• Frequency sweep: 20 Hz to 20 kHz across the whole audible range. Tap the live Hz reading to mark a rattle or dropout at that frequency, then replay the mark.
• Subwoofer sweep: 20 to 200 Hz to audition the low end and find rattles.
• Left channel and right channel: sound from one side only, so you know which speaker is which.
• Stereo: the same tone in both speakers, centred.
• Polarity A/B: 100 Hz in phase (A), then inverted (B), three rounds. On a correctly wired pair, B is clearly quieter.
TONE GENERATOR
Any tone from 20 Hz to 20 kHz on a logarithmic slider, with fine steps and quick presets. Sine, square, triangle, sawtooth, white noise and pink noise. Send it to the left, right or both speakers, or play it inverted.
TEST REPORT
Tick what sounded right: left and right channel, stereo balance, bass, mids, treble, no distortion, no rattle. A "played" tag shows which related test ran to the end. Share the report when you are done.
GUIDE
Short steps for setup, sweeps, the subwoofer test, left/right, polarity and safe volume.
GOOD FOR
Car audio installs, home theater and hi-fi setups, new soundbars and Bluetooth speakers, checking a used speaker before you buy it, and tracking down a buzz in a door panel.
SAFE VOLUME
Start with your phone and any amplifier turned down, then raise slowly. Test tones can be loud and can stress speakers and ears. Phone speakers cannot play deep bass; for the subwoofer test, connect the system you want to check.
Ratings & Reviews
New guided subwoofer test: it steps down from 100 Hz to 15 Hz, lets you answer once each step has played for 2 seconds, and keeps the lowest step you heard.
Quick 440 Hz sound check on the home screen.
The test report now shows which tests played to the end.
Missing translations filled in for every language.
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
- 52.2 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