From the seller:

Bundle of 4 - pair\nThe SRX738 combines the performance of a subwoofer-equipped system with single-enclosure ease of use. The 2268H 18-inch patented Differential Drive woofer delivers impressive low-frequency extension without a sub. The midrange is covered by JBL's CMCD Cone Midrange Compression Driver technology using a 2169H 8-inch driver. The CMCD design provides very low midrange distortion, increased sensitivity, extended bandwidth and improved phase coherence. The multi-band, Progressive Transition waveguide assembly also hosts a 3-inch voice coil 2431H compression driver. Bi-amp or full-range passive operation may be selected by means of a recessed, high-current switch mounted on the input plate. The enclosure is constructed of top quality birch plywood and coated in JBL's rugged DuraFlex finish. The attractive CNC-machined, 16-gauge steel grille wraps around the sides of the enclosure so there are no protruding lips on the front of the box\nSystem Type: 18", three-way, bass-reflex,\nFrequency Range (-10 dB): 35 Hz - 20 kHz\nFrequency Response (±3 dB): 44 Hz - 20 kHz\nCoverage Pattern: 60° x 40° nominal\nCrossover Modes: Bi-amp / passive, externally switchable\nCrossover Frequencies: 2 kHz / 350 Hz\nPower Rating Passive: 800 W / 1600W / 3200 W\n(Continuous1/ Program/Peak): Bi-amp LF: 800 W / 1600W / 3200 W\nBi-amp MF/HF: 350W / 700W / 1400W\nMaximum SPL: 130 dB SPL peak\nSystem Sensitivity (1w @ 1m): 95 dB SPL (passive mode)\nMid / High Sensitivity (1w @ 1m): 108 dB SPL (bi-amp mode)\nLF Driver: 1 x JBL 2268H 18-inch Differential Drive woofer\nMF Driver: 1 x JBL CMCD-81H Cone Midrange Compression\nDriver with integral 2169H 8-inch Differential Drive driver\nHF Driver: 1 x JBL 2431H 4-inch voice coil, neodymium compression driver\nNominal Impedance: Passive: 8 ohms\nBi-amp LF: 8 ohms\nBi-amp HF: 8 ohms\nEnclosure: Trapezoidal, 15mm, 11-ply birch plywood\nSuspension / Mounting: 5 x suspension points, M10 or optional track kit\nTransport: 2 x steel handles\nFinish: Black DuraFlex finish\nGrille: black, 16 gauge perforated steel . Removable JBL\nbadge and punched JBL logo.\nInput Connectors: Neutrik Speakon NL-4 (x2)\nDimensions (H x W x D): 43 in x 21.3 in x 25.5 in\nNet Weight: 95 lbs.