Gallery

I2C Interface

Variable crossover frequency automated by latched relays

Arduino DUE shield

Graphic Interface

First audio test of the filter module (one channel 2 ways)

2 X Linear center tapped dual power supply units for the filter modules

Filter Module

Again the filter module

in red the I2C addressing DIP-switch

LED Bar switchable debugging tool

State variable filter core

State variable filter core from another angle

Populated for 3-bit (8-steps) variable frequency

The Xover44 original logo

2 X 3A Single voltage power supply units for Arduino DUE, relays, and a DC/DC converter to lower the voltage for MCP23017s

The digital controller of the board

Finding the best arrangement in the chassis

The complete testing configuration

My previous project, a 2nd order 3-Way state variable crossover all controlled by military rotary switches. Also here we can control frequencies, resonances and volumes, but it is fixed at 12db/oct. Sounds good but I definitely like better the Xover44 sound till now, probably because the shorter signal paths and the better passive audio elements selection. Anyway I believe that now days a 24db/oct roll-off filter is preferable with the most speaker drivers available on the market.