ESX VX21PRO- SPL CAR SUBWOOFER. With the VX21PRO from the VISION PRO series ESX offers an SPL subwoofer of the superclass. Resilient up to 6,000 watts RMS and 12,000 watts of music power. Alone the key data of this giant are more than impressive and let the SPL fans fall into ecstasy. Mighty Aluminum Basket with high stability – a must with this with these mighty dimensions. 4 x 150 oz Quad Magnet Driver with a total weight of 17 kg. Double Stitched High-Roll Foam Surround, which allows a very high excursion of the cone. Fiberglass reinforced Paper Cone with an effective surface of 1662 cm2. 6-layer Nomex Spider, which ensures a good and long-lasting cone. 8-layer 10 cm (4) Voice Coil (Made in the USA), which was wounded with copper sheathed ribbon aluminum wire, 80 mm high and is thus very light and efficient. Voice Coil Former made of black anodized aluminum. +/- 23 mm linear stroke, +/- 35 mm X-Max. Integrated 10 mm2 speaker cables with 1,5 m length. 53 cm (21) SPL Subwoofer. SPL up to 160 dB. Installation depth 335 mm. Installation diameter 495 mm.