This is an assembled 2-way electronic crossover board. Filtering function is Linkwitz-Riley type with -24dB/Oct. Linkwiz-Riley filtering is regarded as the best type of filtering for audio crossover due to the excellent phase response, zero phase difference at crossover junction and absolutely flat amplitude response. We do air shipping worldwide at US$6.50. PCB Dimension : 173mm x 69mm.Supply voltage : 14Vx2 ac to 19Vx2 ac.We provide schematic and a component diagram to users to change component values to frequency they prefer to buyers by email.