Sweep: Speaker Tuning

Get exact receiver settings from a guided measurement, or plot full frequency response yourself. No laptop, no mic stand — just your iPhone. Free, on-device, no account.

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.

TWO WAYS IN No audiophile experience required. Tune My Receiver runs a guided measurement, then hands back actual settings — "Bass +5, Treble +8" — instead of a chart to interpret. A plain-language results tour walks through what it found, and Balance Speakers checks your channels match before you start. Measure Again starts a new before-and-after round without losing the first. Prefer the full picture? Everything above is one tap away, from the same library.

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. Pinch to zoom into any band; hold near the edge to pan. • Target curves — overlay Harman Room, B&K, a tilt, or Room Gain as a dashed reference so you know what "good" looks like, not just what you measured. • Aim at what you listen to — pick a listening style (Bass-forward, Warm, Bright, and more) and Tune My Receiver's recommendation steers toward it, not just flat. • Average or Difference — power-average two or more captures (walk the room, average the seats) or compute A − B to see exactly what a change did, both as new measurements you can keep comparing. • Real smoothing, applied after the fact — every capture keeps its full resolution; change 1/24 to 1/3-octave anytime and every trace redraws, no re-measuring. • 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. From Tune My Receiver, the card carries your verdict and knob settings too. • Handoff to your Mac — pair once, and send a capture straight to Sweep for Mac's library: device to device, encrypted, no internet, no cable. Off by default; turn it on in Settings. • Undo delete — swipe away a measurement by mistake? Undo is right there for a few seconds.

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 are processed entirely on your iPhone. They go only where you send them — a paired Mac in the same room, or a file you share.

Free. No in-app purchases, no account.

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