Not too big a horn is a dicatomy (sp).Just about any of the required enclosures for the lowther drivers have a larger size cab.The Jericho horn or the Medallion 2 is about the best enclosures ,but the Medallion will only go down to around 60Hz,the Jericho around 45 hz (PM2a)when corner loaded so a sub may be required.If this is your first trip into HE drivers and unless your woodworking skills are fairly good, i would stick to the MLTL that Martin suggests. I am not a big fan of passive circuits but for a low Qts driver in a simple cab its about the only option (at present). ron