Stain Acoustics: RT60 Meter

1.6.0

House of Stain

0.00

0 reviews

10+
Downloads

$10.99

RT60, frequency response & SPL meter — speaker & room acoustics tools.

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10+ downloads

Pros & Cons

Privacy-first design: no ads, no analytics, and data stays on-device.
USB microphone support with .cal files and automatic calibration.
One-time purchase: all features unlocked with no subscriptions.
Exports FRD for industry tools (XSim, VituixCAD) and supports multi-angle measurements.

Very limited initial adoption with 10+ downloads and no ratings yet.
Best accuracy requires a USB measurement mic; phone mic alone is not measurement-grade.
Price may be a barrier for casual users.

About Stain Acoustics: RT60 Meter

Stain Acoustics: RT60 Meter is a music & audio app developed by House of Stain.

Download Statistics

Stain Acoustics: RT60 Meter has been downloaded 21 times. In the last 30 days, the app was downloaded 7 times. It is ranked in the top 100 music & audio apps.

User Ratings

The app has no ratings yet.

App Information

Stain Acoustics: RT60 Meter costs $10.99 to download. The APK download size is 8.60 MB. The latest version available is 1.6.0. The last update was on July 28, 2026.

Technical Requirements

The app has a content rating of Everyone. The app has been available on Google Play May 2026.

Description

Stain Acoustics is an acoustic measurement and loudspeaker analysis tool for Android. Use your phone's microphone — or plug in a USB measurement mic with a .cal file — and get the numbers that matter: RT60, frequency response, harmonic distortion, and more, all computed from a single log-sweep recording.

WHAT'S INSIDE

Room Analyser
Measure reverberation time (RT60) using the ISO 3382 T20 method, clarity (C80), early decay time (EDT), definition (D50), signal-to-noise ratio, per-octave RT60, and the full frequency response. See the Schroeder decay curve on a tappable chart, compare octave bands side by side, and read interpretive notes on what the numbers mean for your room. Diagnostics flag room modes and speaker-boundary interference (SBIR) notches with predicted boundary distances.

Simple Sweep
A fast single-speaker test. Measure frequency response (with selectable 1/12, 1/6, 1/3 and 1/1 octave smoothing), harmonic distortion (THD plus H2, H3, H5), step response, impulse response, energy-time curve (ETC), waterfall (cumulative spectral decay), unwrapped phase, and group delay. Export results as FRD for XSim, VituixCAD, or any industry-standard crossover tool.

Speaker Lab
Build a library of speaker profiles and take multi-angle measurements (0°, ±15°, ±30°, ±45°...) to study directivity and off-axis response.

Sound Check
A calibrated C-weighted SPL meter (dB(C) per IEC 61672) with automatic level adjustment — finds the right playback volume for a sweep so you get a clean measurement every time.

Microphone calibration
Upload a .cal file for your USB measurement microphone; the sensitivity header is parsed automatically. No USB mic? Run the phone-microphone calibration wizard, which compares your phone against a USB reference and generates a correction curve. A manual sensitivity override is also available for users who can compare against a known SPL reference.

Recommended hardware
The Dayton Audio iMM-6C is a calibrated USB-C measurement microphone we recommend for accurate readings — drop in its .cal file and the app applies the per-unit correction automatically. The iMM-6C is one example among other calibrated USB measurement mics the app supports; any mic with a standard .cal file will work.

TECHNICAL DETAIL

• Farina exponential log-sine sweep (20 Hz – 20 kHz, 10 s, 48 kHz)
• Wiener-regularized frequency-domain deconvolution with SNR-adaptive regularization
• 1 kHz acoustic sync pulse + cross-correlation to eliminate Android, USB, and Bluetooth playback-latency jitter
• Zero-phase 2nd-order Butterworth bandpass per ISO octave band
• T20 RT60 estimation with T30 fallback (×3 / ×2 extrapolation)
• Schroeder backward integration
• Farina harmonic extraction from time-shifted echoes in the deconvolved impulse response
• C-weighting filter per IEC 61672, normalized to 0 dB at 1 kHz

Plays through the built-in speaker, 3.5 mm jack, USB DAC, or Bluetooth. Records through the phone mic or a USB audio interface using the Unprocessed input preset — AGC and noise-suppression are disabled.

BE REALISTIC ABOUT PHONE MICS

A phone microphone is not a measurement-grade instrument. For qualitative room diagnostics, A/B speaker comparisons, and setting playback levels it works well, especially after running the phone-mic calibration wizard. For quantitative work — reports, certifications, or any claim backed by numbers — plug in a proper USB measurement microphone with its .cal file.

PRIVACY

No ads. No analytics. No trackers. No network calls at all. Recordings and measurements stay on your device. The full privacy policy is linked on this Play Store listing.

ONE-TIME PURCHASE

Stain Acoustics is a paid app. No subscriptions, no in-app purchases, no ads — one price, all features unlocked.

COMING SOON

• Sub Crawl — optimal subwoofer placement via bass-only multi-point SPL minimization.

Questions or bug reports? Email sales@houseofstain.com — you'll reach me, the developer, directly.

Recent changes:
What's new in 1.6.0

Measurement accuracy overhauled:
• Room Analyser RT60 spectrum fixed — bands no longer vanish or read too long
• Noise floor read correctly, validated against pro tools
• MEASUREMENT SUSPECT flags corrupted captures
• Results explain themselves — findings, verdicts, honest figures

The response graph, redesigned:
• Bigger, full-width, REW-style smoothing, clearer charts
• Distortion shows H2/H3/H5 harmonic curves

Plus: phone-mic wizard fix, targets Android 16

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More data about Stain Acoustics: RT60 Meter

Price	$10.99
Total downloads	21
Recent downloads	7
Rating	No ratings
Ranking	Top ranked
Version	1.6.0
APK size	8.60 MB
Number of libraries	?
Suitable for	Everyone
Ads	NO ads

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Alternative downloads for the Stain Acoustics: RT60 Meter app

Stain Acoustics: RT60 Meter compared with similar apps

Common keywords of similar apps

Usb Room Mic Cal File Acoustics Harmonic Khz Stain Numbers Distortion Decay Full Read Calibrated Playback Wizard Tools Acoustic Tool Plug Single Log Analyser Iso Schroeder Compare Bands Side Diagnostics Boundary Smoothing Measurement Response Speaker Microphone Phone Time Frequency Spl Sweep Octave App Meter Noise Curve Calibration Measure Impulse

Keywords missing from this app

Sound Audio Db Signal Level Spectrum Measurements Display Data Device Analyzer Real Test Polarity Generator Phase Recent Decibel Rta Function Spectrogram Shows Hz Fast Audiotool Frequencies Button Values Pulse Speakers Peak Pink Check

Downloads over time

Stain Acoustics: RT60 Meter has been downloaded 21 times. Over the past 30 days, it has been downloaded 7 times.

Changelog of Stain Acoustics: RT60 Meter

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Developer information for House of Stain

House of Stain

sales@houseofstain.com

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Google Play Rankings for Stain Acoustics: RT60 Meter

Top rankings

Rank	Country	Category	List
19	Norway	Music & Audio	Top Grossing
197	Switzerland	Music & Audio	Top Paid
197	India	Music & Audio	Top Paid
197	Mexico	Music & Audio	Top Paid
198	Austria	Music & Audio	Top Paid
198	Belgium	Music & Audio	Top Paid
198	Indonesia	Music & Audio	Top Paid
199	Denmark	Music & Audio	Top Paid
199	Finland	Music & Audio	Top Paid
199	Netherlands	Music & Audio	Top Paid

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Ranking history in Norway

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