Features & BenefitsLong throw flyable subwooferOperates down to 30HzCompact clam shell designArray up to 8 elements7:1 static load factorEasily ground stackablePowered version available ApplicationsTouring applicationsPortable entertainmentTheatersHouses of worshipBallroomsDiscos & clubs The C-218-12 is a long excursion subwoofer loaded with double 18″ woofers. Each enclosure is constructed of high grade birch ply-wood and is custom fitted with steel fly hardware that has been test rated for a 7:1 static load, hanging up to 8 enclosures in a single array. Our user friendly hardware allows for hanging and ground stacking applications, permitting the user to stack up to four enclosures. This subwoofer will also fly in an array with C-212x, C-210ii & C-208 line array. All C-218-12 enclosures are hand wired using premium 14 gauge wire and Neutrik brand NL4 connectors. All drivers are built with cast fame baskets for strength and longevity. The enclosure is a compact clam shell design that is great for longer throw touring applications. Our components are designed and built to a commercial standard and have a proven track record on tours ranging from stadiums to festivals of up to 30 shows per month with practically a nonexistent failure rate. All C-218-12 enclosures are equipped with a removable back panel that can be disconnected and replaced by an internal TVi two channel “Class D” power amplifier module. Each power amplifier has a built in multi-channel processor that has been chamber tuned for the C-218-12 to achieve a flat response curve with pre set limiters, DSP and crossover points. One amplified C-218-12 subwoofer enclosure will also power one additional non-powered C-218-12 subwoofer enclosure by daisy chaining an NL4 cable.specifications c-218-12 Long Excursion Sub (NL4) 2×18″ Frequency Response (+/-3 dB) 30 Hz – 250 Hz Program Power (watts) LF-2400 RMS Power (watts) LF-1200 SPL & Sensitivity (1w/1m) 137dB / 103dB Coverage Angle Long Excursion Nominal Impedance LF-4ohm Dimensions (HxWxD) 536.1″ x 31.4″ x 20.4″ Weight & Material 154.32 lbs 3/4″ birch plywood C-218 Amplification C-218 (1100 series) 2 channel amplifier module (Designed to power one or two C-218-10, 12 or 12ii enclosures in bi-amp) A single two channel “ICE” powered class D amplifier module can power one or two C-218 subwoofer enclosures. Amplifier channel one powers the right side driver and channel two powers the left side driver of one or two subwoofer enclosures. When powering one C-218 enclosure it is an 8 ohm load for each channel. When powering two C-218 enclosures it is a 4 ohm load for each channel. The amplifier module has been designed to fit securely into the enclosure and offers the ability of powering itself plus one additional non-powered C-218 by linking an NL4 connector cable. Each amplifier is powered by multiple “ICE” power modules and offers an integrated active crossover system along with DSP correction that has been fine tuned in an anechoic chamber to provide the user with chambered flat response. Powered using multiple “ICE” power modulesUltra light weight digital switching technology (8 lbs)Built in DSP correction softwareBuilt in digital crossovers to optimize power and clarityChamber tuned for suggested phasing a flat response correctionDurable and heat resistant design to eliminate pre-mature thermal protectionNon-powered enclosures are connected to powered enclosure with NL4 patch cablesLinkable “Neutrik Power-con” connection capable of 110v or 220v Installation Process When installing the amplifier pack, remove the passive panel on the back of the enclosure by un-screwing the t-nut bolts. Once the passive panel has been removed, connect the amplifier by following the simple color coded diagram provided. Once the amplifier has been properly connected, slide the amplifier module into the enclosure and secure with the t-nut bolts. Link the second passive C-218 to the first with standard NL4 patch cable. Amplifiers are powered by a linkable “Neutrik Power-con” connection and capable of 110v or 220v. Amplifiers ordered for a specific voltage must me slightly modified when changing voltage. Please contact a TVi reprehensive for more information about this. Please see the data sheets for more detailed information on this amplification.