Great work! very impressed about your speaker! Thank you all for the informations, now i must take the necessary to try to make this tqwt!

Thanks! But i Need costruction Plan, and indication about notch filter. Now my sp200x was fitted in 60lt reflex accorded at 30-35 hz with notch serial (1mh, 2,5nf and 10ohm) in parallel to signal. But bass May Be Better i think...

Hi to all, my names Is Alex and i am italiano..i'm searcing for the project of the speaker for sp200x described at the beginning of the thread! Can someone give me some information about It? Thanks