JBL Loft 30 Two-Way 4″ Bookshelf Loudspeaker (Pair) for $34.88 shipped. Here is a screenshot for reference. The series’ Loft30 is a pair of compact, two-way speakers made for the bookshelf or the wall. (Either way, you’ll want to show off their elegant looks.) Each speaker in this pair features a 4-inch (100-millimeter) PolyBass woofer for clear, resounding bass and a 1-inch (25-millimeter) soft dome tweeter that can reach frequencies up to 20kHz. Most places have it for about $65.