Support

There are two possible reasons, and both are Android's own constraint:

1. Your phone does not allow system-wide effects. Android does not support this on every device; it depends on the manufacturer's audio implementation. When that is the case, Amplia tells you plainly on the boost screen. The answer is Amplia's own player, where the effects are guaranteed to apply.

2. The app you are playing in has its own equalizer switched on. When an app installs its own audio effect, Android silently disables ours. In Spotify, turn off Settings → Audio quality → Equalizer and try again.

Three possibilities:

You are on the free tier. Free tops out at +6 dB; Pro goes to +20 dB.

Your device refused it. The dial shows the gain your phone actually applied. If the phone will not give you all of what you asked for, the reading stops there — because we do not display a number that did not happen.

You are on Android 8.0 or 8.1. The DynamicsProcessing API the limiter relies on arrived in Android 9. Below that we cannot guarantee distortion is held back, so we deliberately keep the ceiling lower.

That is a bug, not a tradeoff. There is always a limiter in the chain and its entire job is to prevent exactly this.

Please write to us with: phone model, Android version, which app you were playing in, and what the dial read in dB. With those four we can reproduce it.

Because it genuinely is an estimate. Measuring the sound pressure at your ear would require microphone permission, and we do not ask for it — a volume booster has no business listening to your microphone.

The estimate is computed from your device volume, the gain applied and the typical behaviour of the connected output, then assessed against the WHO/ITU-T H.870 guideline. It is trustworthy as a guide, not as a measurement — and the screen says so.

Play Store → your profile picture → Payments and subscriptions → Subscriptions → Amplia → Cancel.

The Manage subscription row inside the app takes you to the same screen.

Deleting the app does not cancel the subscription. A Play subscription keeps renewing whether or not the app is on the phone.

The monthly and yearly plans start with a 7-day free trial; the weekly plan has no trial. When the trial ends, your Play account is charged unless you cancelled at least 24 hours beforehand.

Two days before that first charge Amplia sends you a notification naming the date and the amount. We do not want you to be surprised.

Use “Restore purchases” in the app. You need to be signed in with the same Google account you bought it with.

Moving to a new phone works the same way: same Google account, then restore. If it still does not appear, write to us — including the Play order number gets it solved faster.

Your settings, presets, profiles and exposure history are only ever on your phone. Uninstalling the app deletes all of it.

If you subscribed, there is a purchase record at RevenueCat. You can ask for it to be deleted by writing to [email protected]; we forward the request and confirm when it is done. Deleting that record also ends Pro access on that installation.

The detail is in the Privacy Policy.

Android 8.0 and newer. The limiter guarantee holds on Android 9 and above; on 8.0–8.1 the gain ceiling is deliberately lower.