JBL Summit's 3.5-way flagship reference loudspeaker — a compression driver on an HDI Sonoglass acoustic horn handles high frequencies, two 250 mm JMW250SC HC4 mid-bass drivers cover the mids, and two 380 mm JW380SC HC4 woofers handle the bass (one with extended 0.5-way low-end bandpass at 270 Hz). 4 Ω nominal (2.7 Ω min), 96 dB sensitivity, 25–1,200 W RMS amplifier window, 237 kg per cabinet; dual rear flared bass ports, OCC silver-plated copper internal wiring, tri-amp/tri-wire capable.