I am going to build a pair of Open Baffle speakers . My tweeter is ESS Heil AMT 1 . I am trying to deicide on which one of these 4 woofers too use . SB Audience Bianco -150b350 , Goldwood 215/8 , Goldwood 212/4 or8 and Lii Song W15 . If anyone has used these send me a comment on using them . Please do not send me opions if you have not personally used any of these speakers . The Goldwood specs. look great and the price is the best. Thanks for any info.