JBL Summit's 3-way reference floorstander — three D2815 dual-motor compression drivers feed an HDI Sonoglass acoustic horn through a 3-into-1 manifold, paired with a 250 mm JMW250SC HC4 mid-bass and a 380 mm JW380SC HC4 woofer. 4 Ω nominal (3.27 Ω min), 92 dB sensitivity, 25–600 W RMS amplifier window, 108 kg per cabinet; dual rear flared bass ports, internally-offset multi-braced pressed curved walls, tri-amp/tri-wire capable.