Sweep: Speaker Tuning

Plot your speaker's frequency response from your listening position. No laptop, no audio interface, no mic stand — just your iPhone. On-device, no account, free.

See how your speakers really sound.

Sweep plays a log sweep through your speaker and plots its frequency response — measured from your listening position. No laptop, no audio interface, no mic stand. Just your iPhone, a calibrated mic, and a clear picture of what you're hearing.

The untethered scout between full bench sessions — the fast check from your chair you'll actually run. A minute, not an afternoon.

SWEEP. CAPTURE. COMPARE. • Sweep — tap once and a 20 Hz–20 kHz log sweep plays through your speaker (the Farina ESS method the bench tools use). • Capture — a calibrated measurement mic (Dayton iMM-6C, miniDSP UMIK-1/UMIK-2/EARS, Behringer ECM8000, or any REW .cal file) or your iPhone's built-in mic records it; on-device math extracts the impulse response and plots the curve. • Compare — overlay up to 5 runs, each its own color, to see exactly what a change did. Measure, adjust, measure again.

ALSO IN THE APP • Scrub any frequency — drag the cursor; it snaps to peaks and troughs and reads frequency · dB right where you need it. • Real smoothing — 1/24 to 1/3-octave, so you see the actual ripple, not a prettied-up line. • Set levels with confidence — a built-in test tone and live meter get your output where it should be before you measure. • Share your capture — export the chart as a labeled image card: color-coded traces, an optional cursor callout, one tap to send anywhere.

HONEST BY DESIGN Sweep shows relative frequency response — the shape you need to tune speaker DSP and EQ. A time-gate isolates the direct sound; the low end reflects your room, and the chart marks that region plainly. Results are only as calibrated as the mic file you import. Not an SPL meter, not a full bench replacement — it names its limits up front, so you can trust its strengths.

PRIVATE BY DEFAULT Everything runs on your device. No account, no signup, no cloud, no tracking, no analytics SDK. Your measurements and audio are processed entirely on iPhone and never leave it. Free. No in-app purchases, no account.

Sweep is part of a family of focused instruments alongside Pull, Grip, Lean, and Level.