Groove: Turntable Setup Calculator — Support

Need help?

Email roman.kopaliani@gmail.com with your question. Please include:

• What you were trying to do
• What happened
• The iOS version and iPhone or iPad model you're using (Settings → General → About)
• The app version (Groove → Settings → About)

Common questions

What does Groove do?

Groove is a turntable setup calculator. It computes cartridge alignment (overhang, offset angle, and null points), the tonearm/cartridge resonance frequency, and electrical loading, then saves each deck's numbers in a profile. Every figure names its authority — Löfgren and Baerwald for alignment, Hi-Fi News for the resonance window, the IEC/DIN groove standards, and Vinyl Engine and Korf Audio for the reference tables — with a Sources screen that links them.

What's free, and what's in Groove Pro?

Free forever, with no time limit: Baerwald alignment (IEC and DIN), the full resonance calculator, the setup reference, and one saved turntable. Groove Pro is a single one-time purchase — no subscription — that adds Löfgren B and Stevenson alignments, cartridge loading (moving-magnet capacitance budget and moving-coil load impedance), and unlimited saved turntables.

I already bought Groove Pro on another device. How do I restore?

On the new device, open Settings → Restore Purchases (or tap "Restore Purchases" on the paywall). Your unlock is restored from the App Store account that originally purchased.

Which alignment geometry should I use?

Baerwald (Löfgren A) minimizes average distortion across the record and is the common default — it's the free geometry. Löfgren B lowers distortion across most of the side at the cost of slightly more at the very ends; Stevenson puts the inner null right at the run-out to favor the final grooves. Löfgren B and Stevenson are part of Groove Pro. All three are computed from the same verified two-null solution.

What is the resonance "sweet spot"?

The tonearm and cartridge form a spring-mass system with a resonant frequency set by the arm's effective mass and the cartridge's compliance and mass. You want it to land roughly between 8 and 11 Hz — below that invites warp and footfall trouble, above it creeps into the audible band. Groove computes the frequency and tells you which zone you're in. If your cartridge's compliance is specified at 100 Hz, one toggle converts it to the 10 Hz figure the formula needs.

How does cartridge loading work?

For moving-magnet cartridges, Groove adds your tonearm cable and phono-stage capacitance and compares the total to the cartridge's target, so you can pick the right loading. For moving-coil cartridges, it gives the recommended load impedance. Loading is part of Groove Pro.

Does the app work offline?

Yes. Groove never makes general network requests; the only exception is Apple's StoreKit for the Pro price and restoring purchases. All calculations are local.

How do I delete my data?

Delete the app from your iPhone or iPad. All local data, including saved turntable profiles, is removed along with it.

Good to know

Groove is a setup aid, not a substitute for your tonearm and cartridge manuals. Compliance and mass figures come from your cartridge's published specs; confirm them against the manufacturer. A printable on-screen protractor is planned for a future update — for now Groove gives you the precise numbers to set on your own protractor.