Designs and simulates the Crossover Filter of your car stereo system or home in a simple and professional way at the same time.

Features and Functions:
• Crossover Filter Calculation for Two-Way 6 / 12 / 18 and 24dB / octave.

• Crossover Filter Calculation for Tweeter to 6 / 12 / 18 and 24dB / octave.

• Crossover Filter Calculation for Mid-range to 6 / 12 and 18dB / octave.

• Crossover Filter Calculation for Subwoofer / Woofer to 6 / 12 / 18 and 24dB / octave.
Ability to select the "Q factor of Merit" in Two-Way, Tweeter and Subwoofer / Woofer (Butterworth, Bessel, Chebyshev, Linkwitz-Riley and Linear Phase).

• Zobel Circuit Calculation.

• Speaker Attenuation Calculation.

• "Check Projects" of filters already existing.

• Notch Circuit Parallel Calculation.

• Notch Circuit Series Calculation.

• Calculating Resistances, Coils and Capacitors in series or parallel connections.

• Calculation Speaker Cable Attenuation and Cable Resistance with selection of metal cable (Copper, OFC Copper, LC-OFC Copper, Tin-Plated Copper, Nichel-Plated Copper, Silver and Aluminium).

• Conversion table for AWG / mm / mm2.

• Signal Generator, slide to select the Frequency from 20Hz to 20KHz, Sweep Up and Sweep Down to 20Hz/20KHz, Ascending tones, Descending tones, Pink Noise and White Noise.

• Assembly diagram of Crossover.

• Generates PDF files or image files to share or save your project.

• Sharing of projects through Mail, iMessage and Social networks.

• Saving of project in Photo, iBooks, Note, Dropbox, Google Drive, Evernote, etc.

• Printing of project.

What’s New

Version 4.24.8

Bug fix Two-Way 12/18 db Butterworth.
Add Butterworth in Midrange 12/18 db.

Ratings and Reviews

4.5 out of 5
4 Ratings

4 Ratings

Bovles ,

Calcolo filtri

App fatta molto bene ed intuitiva benché l’argomento trattato sia molto molto complesso

Developer Response ,

Grazie Mille, l'intendo era proprio quello. I consigli per migliorare sono sempre ben accetti.

Alfio1 ,


Veramente comodo, rapido, bello, utile! Bravo Pasquale, inserisci se puoi i segnali acustici per il test è poi é completo.

Birraio Novello ,

Questa versione non funziona

Purtroppo in questa versione sono presenti molti errori di calcolo, dai vìcalcoli del filtro midrange, alla sezione dei cavi, inoltre il generatore audio va su iphone ma non su iPad, da migliorare velocemente.

Developer Response ,

Grazie per feedback. Per una sezione di calcolo errato ne sono al corrente e a giorni sarà rilasciato un update. Per quando riguarda il Generatore di Segnale su iPad non risultano problemi. Se invii una mail dall’app con le caratteristiche dell’iPad che usi sarà mia premura nel risolvere il problema.


Pasquale Puglisi
29.4 MB

Requires iOS 8.2 or later. Compatible with iPhone, iPad, and iPod touch.


English, French, Italian, Spanish

Age Rating
3,49 €


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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