# Filters — Calculating speaker filters > Calculates electronic filter components and designs speaker circuits with frequency and phase diagrams. (iPhone/iPad app by Gianluca Natalini.) - Source: https://appshunter.io/ios/app/filters/id369326771 (this page in markdown: same URL + `.md`) - Developer: [Gianluca Natalini](https://appshunter.io/developer/348380792) - Category: Productivity, Utilities - Price: $0.99 - Rating: 3.00/5 from 1 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 16.0 · 3 MB - Languages: American English - Released: 2010-04-25 - Data updated: 2026-09-07 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/filters/id369326771/reviews.md ## What is Filters? "Filters" is an application for the calculation of electronic filters for the construction of speaker systems. The program automatically calculates the values of electronic components (inductors, capacitors) of electronic filters depending by the desired speaker impedance and the cutoff frequency. The software can calculate and design the circuits (filters) for high, medium, low, sub woofer, etc... first and second order. Once calculated the filter’s circuit the app will automatically design for You the frequency and phase diagrams (Bode plots). Build the speakers of your dreams with "Filters"! Features: - Automatic calculation of the electronic components of the filters for high, medium, low, sub woofers etc... - Display of frequency and phase diagrams (Bode plots) for the calculated values of the circuit’s electronic components - Display electronic circuit’s schema (filter) - Complete theory for formulas/circuits for all the filters implemented in "Filters" ## Key features - Automatic electronic component calculation - Frequency and phase diagram display (Bode plots) - Electronic circuit schema display - Support for various speaker types (high, mid, low, sub) - First and second-order filter design - Complete filter theory and formulas ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/filters/id369326771/reviews.md ### 3/5 — Good but... *2012-05-17* It's a handy calculator but it's lacking a high pass 2nd order filter (12dB per octave). A Zobel calculator, attenuation calculator and third order filters would be nice too. ## Frequently asked questions about Filters ### What kind of filters can Filters calculate? Filters can calculate electronic filter components for high, medium, low, and subwoofer speaker systems. It supports both first and second-order filter designs. ### Does Filters display circuit diagrams? Yes, Filters displays the electronic circuit schema for the calculated filters. It also provides complete theory and formulas for all implemented filter types. ### What are the system requirements for Filters? Filters is available for iPhone. The latest version is 2.3, and it was last updated on January 9, 2026. ### How much does Filters cost? Filters is a paid application and costs $0.99. It does not appear to have any in-app purchases or advertisements. ### What is the user rating for Filters? Filters has a rating of 3.0 stars from 1 rating. This indicates a mixed reception from its current user base. ### Can Filters design filters for specific speaker impedances? Yes, the application automatically calculates electronic component values based on the desired speaker impedance and the cutoff frequency. ### Does Filters provide visual representations of the filter's performance? Yes, once a filter's circuit is calculated, the app automatically designs and displays frequency and phase diagrams (Bode plots) for the circuit's electronic components. ### Is Filters suitable for beginners in speaker building? Filters provides automatic calculations and circuit designs, along with complete theory for formulas. This can be helpful for beginners, but a basic understanding of electronics is still recommended. ## Version history (last 5 releases) ### 2.3 — 2026-01-09 * Minor bugs fixed ### 2.2 — 2022-11-28 * Minor bugs fixed ### 2.1 — 2019-10-07 * Minor bugs fixed ### 2.0 — 2016-05-06 * Widescreen display compatibility added * Fixed bugs for iOS 7.x , 8.x , 9.x, … ### 1.0 — 2010-04-24 No release notes. ## Apps similar to Filters | App | Rating | Price | Category | | --- | --- | --- | --- | | [QuikQRCode](https://appshunter.io/ios/app/quikqrcode/id1540488095) | 3.4 (5) | $2.99 | Productivity | | [Calctronics: Circuit Calc Pro](https://appshunter.io/ios/app/calctronics-circuit-calc-pro/id1583600520) | 4.3 (3) | $4.99 | Productivity | | [Mission Ctrl for DigitalOcean](https://appshunter.io/ios/app/mission-ctrl-for-digitalocean/id1671486255) | 3.8 (10) | Free | Productivity | | [EE ToolKit PRO](https://appshunter.io/ios/app/ee-toolkit-pro/id368780426) | 4.9 (293) | $12.99 | Productivity | | [Chrono Plus – Time Tracker](https://appshunter.io/ios/app/chrono-plus-time-tracker/id944992206) | 4.1 (75) | Free | Productivity | | [Good PDF Notebook - Pencil App](https://appshunter.io/ios/app/good-pdf-notebook-pencil-app/id6466286421) | 3.7 (3) | Free | Productivity | ## More apps by Gianluca Natalini - [Stroboscope Alarm Clock](https://appshunter.io/ios/app/stroboscope-alarm-clock/id348380789) - [Lightning Distance Calculator](https://appshunter.io/ios/app/lightning-distance-calculator/id348821275) - [Chronometer and Countdown](https://appshunter.io/ios/app/chronometer-and-countdown/id348852710) - [Basal Body Temperature Calc.](https://appshunter.io/ios/app/basal-body-temperature-calc/id351060251) - [Vibrometer](https://appshunter.io/ios/app/vibrometer/id353867884) - [myVibrometer](https://appshunter.io/ios/app/myvibrometer/id357421007) All apps by Gianluca Natalini: https://appshunter.io/developer/348380792 ## Related topics [mahle filters](https://appshunter.io/ios/topics/mahle-filters) · [nd filters](https://appshunter.io/ios/topics/nd-filters) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-07.*