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.