A few users had experienced a crash with the new Sub Alignment wizard. This fixes that issue.

SUB ALIGNMENT WIZARD Line your subs up with your tops, step by step. Measure the tops on their own, then the subs on their own, from one mic position. Spektral works out the delay and polarity that make them add up at the crossover, and tells you which box to delay and by how much: in milliseconds, in samples at 48k and 96k, and in metres. Put the number into your DSP and a third capture checks that it worked, by measuring subs and tops together against what a perfect sum would give. Open it from the Subs button in the transfer function, or with Shift-Command-U. Built for real gigs. Nothing is captured until you press Capture, a box left on by mistake is caught and named, and the timing lock is watched throughout, so a stray click on Re-detect fails the step with a plain reason rather than handing you a wrong number. LIMIT GUARD HEADROOM METER Limit Guard now shows your headroom on a meter: twelve blocks from +6 to -6 dB, counting down as the room runs out, the scale engineers already know. Around it, a marker for the last minute's level shows which way the average is heading, a tick shows where the Leq will sit in five minutes, and when you are close or over, a recovery line tells you what level to hold under and for how long. It pulses amber only while the margin is shrinking, and holds steady while you are pulling it back. The warning margin is now yours to set, at 1, 2, 3 or 6 dB. The same meter appears on the SPL page, the RTA Leq strip and the HUD, so they always agree. TRANSFER FUNCTION Auto EQ corrects towards the target curve you have chosen. It used to aim at a fixed shape of its own, so with a house curve loaded it proposed cutting out the very low end you had dialled in on purpose. The panel now names the target it is aiming at. The target tolerance band can be turned off, leaving the target line on its own. Target and calibration files saved as rich text (.rtf) now import. A spreadsheet, which cannot be read directly, is recognised and named as one, and a file that cannot be read says what layout Spektral expects. DELAY ALIGNMENT Each zone now has a full minute to find its timing, so someone stopping to talk to you mid-measurement no longer costs you the session. If a zone still cannot lock, the wizard lists the usual causes and lets you retry that zone, keeping every zone already measured. FIXES Removing a zone in the delay alignment wizard no longer crashes Spektral. Your chosen input channels are no longer lost after a crash. If your interface was slow to reappear, Spektral fell back to inputs 1 and 2 and saved that over your choice. It now uses 1 and 2 only until your interface is back, then returns to the channels you picked. Remote monitoring only reports readings as synced once iCloud has confirmed them. If iCloud refuses them, Spektral keeps them and says so plainly.

MICROPHONE CALIBRATION Calibrate from your microphone's certificate. A measurement mic ships with a sensitivity figure, and that figure is enough to read true dB SPL without owning a calibrator. Enter it once and Spektral works out the offset for you. If you have a calibrator, that route is unchanged and remains the more accurate of the two. Load your microphone's calibration file. The response file supplied with your mic can now be imported, and the correction is applied to the spectrum itself, so the RTA and the transfer function show the room rather than the microphone. Spektral reads the files the common measurement microphones ship with, including the sensitivity figure many of them carry in the header, so a file you already have works as it is. A calibration that cannot quietly go wrong. Certificate calibration depends on the input volume being where it was when the figure was measured, so Spektral checks it first and says so plainly rather than handing back an offset that is wrong by however far the fader has moved. TARGET CURVES Tune towards a shape, not a flat line. Choose a curve, load one from a file, or take the coherence-weighted average of your captured positions as the target and tune the next rig to match it. Spektral reads the frequency response files other analysers write, so targets you already have work as they are. A Concert PA house curve ships with the app, contributed by a Spektral user from a large-format concert system. Loaded curves are saved into the Target menu and can be renamed, so a file is imported once rather than once per show. Tolerance is selectable from 1 to 6 dB and the band follows the curve. TRANSFER FUNCTION Zoom the magnitude plot: 30, 15 or 10 dB, with the grid following at ten labelled divisions. Comb filtering that was an illegible squiggle at 30 dB reads clearly at 15. Captured traces, their average and their phase now follow the Smoothing control like the live trace. Captures store the raw measurement, so ones you have already taken re-smooth as you change the setting. SPL The report, redesigned. A cleaner document throughout, with the session's headline figures, every rolling Leq window, a wall-clock time axis and a data-quality panel that says plainly what is missing before a report is used as evidence. With Limit Guard configured it states the verdict against the worst rolling window of the whole session, not merely the level at the moment you exported. See the PDF before you save it. Every report, SPL, RT60 and STIPA alike, opens in a preview window first, and cancelling writes nothing. Sessions record in every mode, so the history graph, minimum, maximum and average cover the whole show even while you work in RTA or Transfer. Pause and resume a session between sets, so a support act or an interval does not have to be counted as measured programme. Reset the Leq averages on demand, from the Leq strip, the SPL page or the L key, so a show is averaged from its downbeat rather than from whenever the app was opened. REFINEMENTS The spectrograph fills from the bottom at its final resolution, so a fresh window scrolls smoothly from the first row. The SPL history graph advances at a steady scale over its first quarter hour and is labelled in clock time, matching the report. Limit Guard shows its verdict and countdown on the SPL page as well as the RTA Leq strip. Coherence blanking has hysteresis, so marginal regions fade out instead of flickering. Level colours fade between zones instead of snapping. Gain moves the whole RTA window rather than only its floor, so a hot low end can be brought down the plot.

Ring-Out: Spektral now watches for feedback as you push the system, names the frequency the moment it starts to grow, and builds a list with suggested notch and Q to copy straight to the console. Gain tracking: change your preamp gain mid-show and the SPL calibration follows it, so your readings stay true without recalibrating. Calibration is now remembered per device and per input channel, and survives an interface being moved to a different port. Transfer function phase is more accurate at high frequencies, with sub-sample delay compensation so the delay you read is the delay that was applied. SPL reports now include every Leq window, and the window fits properly on scaled displays.

Feedback Sentinel Spektral now watches for feedback as it forms. Growing tones are flagged on the RTA before they take off, each with a suggested notch (cut and Q), and every confirmed ring is collected into a session ring-out list you can copy straight to the console. Instant replay Right-click the spectrograph (long-press on iPhone) to replay the audio behind any moment in the last minute. Heard something odd? Scroll back and listen again. iPhone wireless probe Run Spektral on your iPhone and it becomes a wireless measurement mic. Its spectrum overlays the Mac RTA in violet, and in Transfer mode the new Probe Mic button uses the phone as the measurement input: walk the room and run the Align wizard with no cable run. Delays over the link read as relative between positions. SPL: rolling Leq and Limit Guard Every Leq readout is now a true rolling window, the last N minutes exactly as a licensing officer measures. The SPL overlay readouts are tappable to pick 1 to 60 minute windows, the SPL page adds a five-tile Leq grid (1m, 15m, 30m, 1h, 8h), and the new Limit Guard counts down to your venue limit with an exact time-to-limit forecast. iPhone SPL meter The iOS app gains a full SPL Monitor mode: hero readout, rolling Leq, min, max, average and history graph from your calibrated phone. Multi-position captures Capture up to 12 positions (up from 6) into the redesigned sidebar, with per-position quality scoring, a coherence-weighted average trace, a position spread band, and show/hide for every trace. Sessions autosave and restore between launches. Delay finder, rebuilt Finds delays up to 1.4 seconds using whitened correlation with a quality gate, locks reliably on music or noise, and the impulse response view anchors the direct arrival at zero with labelled reflections and comb-filter prediction. Refinements Run and pause are now a transport pair with the active state highlighted. Fullscreen keeps the mode tabs as part of the app rather than a detached system bar, and Ctrl+Cmd+F toggles fullscreen. Uncalibrated SPL readouts are labelled dBFS(A) with a clear warning until you calibrate. RT60 and STIPA measurement accuracy tightened after a standards audit. Fixes Major performance work: captures on screen now cost nothing while measuring, menus stay responsive during heavy sessions, and long-running sessions no longer slow down over time. Thanks to our beta testers for the detective work. Keyboard shortcuts no longer fire while typing in text fields or while holding modifier keys.

96kHz support Spektral now runs at 96kHz on interfaces that support it, for finer resolution in the top end. Refinements Hide the spectrograph for a full-height RTA when you want maximum spectrum detail. New toggle to let the cursor free-run instead of snapping to peaks, for pinpointing an exact frequency. Gain and Floor, along with the Peak, Identify and Snapshot tools, now appear only in RTA mode where they apply. Mode tabs respond to a click anywhere on the button, not just the text. The sample rate now reads in kHz in the status bar. Fixes Fixed pink noise stuttering on high channel count interfaces. Transfer function now locks onto the built-in pink noise reliably, since the noise is correlated across channels. The Remote Monitoring window can now be closed with a button, not just the Escape key.

Independent spectrum and SPL weighting — keep the spectrum flat for full bandwidth while still reading an A-weighted (or C, or Z) SPL level. Both are set in Settings. Transfer function with the built-in noise — the pink noise generator is now correlated across channels, so the reference and mic line up and the delay locks when you drive the system from even if there is any output channel mixing.

Multichannel interfaces, done right Switching to a multichannel interface or mixer now works directly in the app, delivering every channel at the correct sample rate, with no need to relaunch. Spektral now remembers your selected input and output device across launches. Reliable signal routing Pink noise and the STIPA test signal now play out of the interface you choose, not whatever the system default happens to be, and pink noise stays on your chosen device even when the macOS default output changes. Sharper readouts and measurement SPL calibration is now saved per device, so switching mics or interfaces and back restores the right calibration. Frequency weighting (A, C and Z) is now a click to change control in the status bar. More accurate RT60 measurements. Transfer function Reflections now stand out clearly from the direct sound in the impulse response, with their predicted comb filtering colour matched to the reflection that causes it. Other improvements Save Session now opens a standard save dialog. Layout fixes so the toolbar controls stay clear on smaller and scaled displays. Stability and performance improvements.

Fixes the pink noise generator cutting out on audio interfaces, adds a dB SPL readout on the RTA when calibrated, and makes switching audio devices smoother.

More accurate SPL We have refined the SPL weighting so dB(A) readings now closely track reference meters. Recalibrate with your calibrator and levels should line up with the house meter. Reference overlay on the RTA With a dual-channel input connected, the new Ref button overlays the reference channel's live spectrum on the RTA, so you can compare a mic against a console feed at a glance. Faster input and FFT switching The input routing and FFT readouts in the status bar are now click-to-change. Set your input device, output device, measurement and reference channels, or FFT size in one tap, no trip to Settings. Refreshed toolbar A cleaner, grouped layout with quick toggles for the input meters and the SPL overlay. RT60 improvements The overall reverberation figure now uses only the high-confidence bands, and low-confidence readings are dimmed so they are easy to spot. Also Spectrogram range handles can no longer be dragged off screen, plus various refinements and fixes.

New • Input level meters — confirm signal at a glance. A floating mic/reference meter for the analyser, plus a per-channel input ladder in Settings that shows exactly which inputs are live (and flags when your interface gives the app fewer channels than it advertises). • Selectable FFT size — choose resolution up to 16,384 points for finer low-frequency detail in both RTA and Transfer Function. • Adjustable generator level — set the pink-noise and STIPA output level from a quick pop-up, in the toolbar and the RT60/STIPA panels. Transfer Function Fixed a regression that stopped Transfer Function working on interfaces with two inputs. Dual-channel capture works correctly again. STIPA (Beta) Speech intelligibility now measures accurately from end to end, with per-band detail, honest no-signal detection, and a generator level control. RT60 More accurate reverberation times, with low-confidence bands clearly flagged. Also new Input level metering for mic and reference, plus a per-channel ladder. Selectable FFT size (2048 to 16384). Output device selection. Adjustable signal generator level. Smoothing and averaging fixes in Transfer Function.

Transfer Function, levelled up. New impulse response view with ETC (log dB) display, auto-labelled reflections (time, distance, level), and comb-filter prediction that links dips in your magnitude trace to the reflections causing them. Manual delay control with sample-accurate nudges, plus a smarter auto delay finder that locks onto the direct sound even when a reflection is louder. Free channel routing. On multi-input interfaces, assign measurement and reference to any inputs — and the RTA now follows your measurement channel only. Tougher audio engine. Fixed crashes when switching audio devices, added automatic recovery when a device stops responding, and squashed a host of UI bugs — including text fields capturing keyboard shortcuts and menus misbehaving while audio runs. Thanks to the users whose detailed suggestions and reports shaped this release — keep them coming via support.spektral.app

• Optional SPL Overlay on RTA/Spectrograph Screen • Improvements to Remote Monitoring • RT60 Measurement • STIPA Analysis

Performance improvements • Significantly improved UI responsiveness, especially on macOS Sonoma and when using the built-in microphone • Smoother mode switching between RTA, Transfer Function, and SPL • Reduced rendering overhead in the spectrum and spectrograph views

Spectrograph range controls — Independent floor/ceiling range handles for the spectrograph heatmap, plus scrollable time history with drag-to-scroll and double-tap to return to live. Multi-position Transfer Function captures — Capture multiple measurement positions into a session, with quality scoring (coherence checks, anomaly detection), weighted averaging across positions, include/exclude individual captures, and PDF session report export. Relative delay reference — Delay finder can lock to a reference and show relative delay for multi-position work. IEC 61672 time weighting — Slow, Fast, and Impulse time weighting options for the SPL monitor (previously only had one mode). Remote Monitor improvements — Fixed background persistence when app is backgrounded, added idle timer lock to prevent session drops. Performance improvements — TimelineView pauses when the analyser is stopped (saves CPU), reduced SPL callback overhead. PDF report fixes — SPL calibration values now match the app display, tidied up summary statistics layout (the changes we just made, not yet committed).

What's New in Spektral 1.5 Improved SPL accuracy — time-domain RMS calculation with IEC 61672 A/C-weighting filters for professional-grade readings SPL calibration redesign — dedicated 3-second capture with stability validation and live progress display Frequency-weighted RTA & Spectrograph — apply A, C, or Z weighting to spectrum displays via Settings Improved microphone permission handling — graceful behaviour when access is denied Stability fix — resolved a crash on launch affecting certain Mac configurations Help menu now links directly to the support site

Improved loading state for Remote Monitoring purchase Performance and stability improvements

• Remote Monitoring add-on: deploy iPhones as wireless SPL stations and monitor every site live from your Mac • PDF compliance reports now include per-site pages for each remote location • Swap input channels for audio interfaces with phantom power on channel 2 • Performance and stability improvements

What's New in Spektral v1.2 SPL MONITOR MODE (NOW LIVE) • Professional environmental noise compliance monitoring • A/C/Z frequency weighting per IEC 61672 standards • Microphone calibration via reference meter or calibrator • Live VU meter with configurable caution/warning thresholds • Leq tracking (15min/1hr/8hr) for regulatory compliance • Session statistics and professional PDF export • SPL aura visual feedback in both RTA and SPL Monitor modes TRANSFER FUNCTION IMPROVEMENTS • Auto-EQ: Intelligent parametric EQ suggestions (up to 6 corrections) • Cursor tracking with frequency/magnitude readout • Smoother phase and coherence displays REFINEMENTS • Separate visual gain from SPL calibration for cleaner workflow • Improved SPL scales (40-120dB) with threshold-based colors • Better settings layout for calibration workflow Bug fixes and performance improvements.

Critical bug fixes