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Sweep: Speaker Tuning

Sweep: Speaker Tuning

Frequency response, untethered

2 ratings
1 review
🔧 Utilities
Free

Details

  • Released
  • Updated
  • July 7, 2026
  • August 25, 2026

Features

Developer

Carl Sieber
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About

Analyze your speaker's frequency response directly from your listening position. This app plays a log sweep and captures the sound with your iPhone's mic or a calibrated external mic, then displays the results. Easily compare multiple measurements to fine-tune your audio setup.

✓Log sweep playback (20 Hz–20 kHz)
✓Frequency response plotting
✓Overlay up to 5 measurement runs
✓Frequency scrubbing with peak/trough snapping
✓Adjustable real-time smoothing
✓Built-in test tone and live meter
✓Export capture charts as images
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+1

What's New in Sweep

1.5

August 25, 2026

Untethered, literally. • Wireless output — send the sweep to any AirPlay or Bluetooth speaker and measure it from where you sit. A short warm-up chuff primes the connection, then the sweep plays. • Honest labels — every wireless trace is marked, right next to the uncalibrated badge, so you always know how a curve was made. Tap either badge for a plain-English explanation. • Smarter under pressure — the short sweep is selected automatically over wireless, a just-switched speaker gets extra settling time, and a sweep that doesn't fully arrive is caught and reported instead of plotted. • A bigger measurement library — tap the handle under the list to expand it over the chart; tap again to bring the chart back. Scroll the collapsed list too. • Capture range (Gated / Full range) moved to Settings, alongside the time gate it belongs with. • Full support for smaller iPhones, and a consistent panel layout across every screen size.

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User reviews

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Has promise

This looks like a really interesting app, and the price is right. Currently, however, I can’t get the sound to play over AirPlay/Bluetooth through my speakers while the app is using my phone’s microphone. Consequently, I’m measuring my phone speakers instead of my regular speakers. So, it isn’t useful for me yet. But, as this is a new app, I hope future updates will make it possible to measure with the iPhone mic while playing through AirPlay/Bluetooth.
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phoneteijnphoneteijn

Response from developer

Thanks for the thoughtful review - and for describing exactly what's missing, which makes it easy to prioritize. You're right: right now Sweep can't play the sweep through AirPlay or Bluetooth while recording with the iPhone mic, so it falls back to measuring the phone's own speaker instead of your actual system. Good news: that's exactly what we're building right now - the ability to play through AirPlay or Bluetooth while the iPhone mic listens, so you can measure your real speakers from your seat, no cables. It's already working in testing. Thanks again for taking the time to write this - it's exactly the kind of feedback that shapes what gets built next.

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FAQ

What is Sweep: Speaker Tuning?

Sweep: Speaker Tuning is a utility app that allows you to measure and visualize the frequency response of your speakers directly from your listening position using your iPhone. It plays a log sweep and analyzes the captured audio to provide a clear graph of your speaker's performance.

How does Sweep: Speaker Tuning work?

The app plays a 20 Hz–20 kHz log sweep through your speakers. It then uses your iPhone's microphone or a calibrated external microphone to capture the sound. On-device processing extracts the impulse response and plots the frequency response curve.

Can I compare different speaker settings with Sweep: Speaker Tuning?

Yes, Sweep: Speaker Tuning allows you to overlay up to five different measurement runs, each displayed in a unique color. This makes it easy to visually compare the impact of adjustments you make to your speaker's DSP or EQ.

What kind of microphone should I use with Sweep: Speaker Tuning?

While the app can use your iPhone's built-in microphone, it recommends using a calibrated USB-C microphone such as the Dayton iMM-6C for more accurate results. The accuracy of the measurements depends on the calibration of the microphone file you import.

Does Sweep: Speaker Tuning have ads?

No, Sweep: Speaker Tuning is completely ad-free. It is designed to be a focused instrument and does not contain advertisements.

Is Sweep: Speaker Tuning available on Android or other platforms?

Currently, Sweep: Speaker Tuning is only supported on iPhone. The app is designed to run entirely on your device and does not require an account or cloud services.

How often is Sweep: Speaker Tuning updated?

Sweep: Speaker Tuning was last updated on July 7, 2026, with version 1.2. The developer, Carl Sieber, focuses on creating specialized instruments, suggesting updates will likely focus on refining existing features and ensuring compatibility.

What are the privacy features of Sweep: Speaker Tuning?

Sweep: Speaker Tuning is private by default. It runs entirely on your device, requires no account or signup, and does not use cloud services, tracking, or analytics SDKs. Your measurements and audio are processed and never leave your iPhone.