JBL VT4887A Manual

Contents

key features

VT4887ASpecifications:Line Array ElementFrequency Range (-10 dB): 55 Hz – 22 kHzFrequency Response (+/- 3 dB): 67 Hz – 20 kHzHorizontal Coverage Angle (-6 dB): 100 degrees nominal (500 Hz – 16 kHz)Vertical Coverage Angle (-6 dB): Varies with array size and configurationSystem Input Power Rating: LF: 1000 W Continuous, 4000 W Peak (AES / 2 hour)MF/HF: 225 W Continuous, 900 W Peak (AES / 2 hour)Maximum Peak Output 1: 131 to 141 dB SPL, 1m (frequency/bandpass dependent)Recommended Amplification: LF: 1000 – 2000 W into 8 ohmsMF/HF: 450 – 900 W into 8 ohmsRecommended Signal Processing: dbx® 4800, Crown ® I-Tech, BSS FDS-366T, and otherDigital System Controllers supportedTransducer SectionsLow Frequency: Two 2168J-1, 203 mm (8 in) dia., 76 mm (3 in) Dual Coil,neodymium Differential Drive®, Direct Cooled™Bandpass Nominal Impedance: 8 ohms (16 ohms each transducer, wired in parallel)Input Power Rating 2: 1000 W Continuous, 4000 W Peak (AES / 2 hour)700 W Continuous, 2800 W Peak (100 hour)Bandpass Sensitivity: 97 dB, 1W / 1m (2.83 Vrms at 3.3 ft)Mid & High Frequency: MID: Four 2104H, 101 mm (4 in) with 25.4 mm (1 in) dia.voice coilHIGH: Two 2408H, 25 mm (1 in) exit compression driver,38 mm (1.5 in) voice coilBandpass Nominal Impedance: 8 ohms (drivers wired in series-parallel, passive network)Input Power Rating 2: 225 W Continuous, 900 W Peak (100 hour)Bandpass Sensitivity: 103 dB, 1W / 1m (2.83 Vrms at 3.3 ft)EnclosureBox Construction: Wedge frustum 5 degree side angle enclosure. PlyMax ®engineered wood composite structure, DuraFlex TM finish,2 handles with integrated LF portsSuspension System: S.A.F.E. hardware, integral hinge bars nest in riggingtubes on box ends. Quick release pins with restraininglanyards. Set of 4 hinge bars included. Suspend withVT4887-AF or VT4887-SF Array Frame.Grille: Black perforated steel, foam backedInput Connectors: Neutrik ® Speakon® NL-8 and NL-4 (2x each), Pin 3+/- forLows & Pin 4+/- for Mid-HighsDimensions (W x H x D): 787 mm x 281 mm x 415 mm(31 in x 11 in x 16.3 in)Net Weight: 30.4 kg (67 lb)Shipping Weight: 40.8 kg (90 lb)1Calculated maximum SPL based on rated peak power and measured sensitivity2AES Standard, one decade pink noise with 6 dB crest factor within device's operational band, free air. Standard AES 2 hrrating plus long term 100 hr rating are specified for cone transducersJBL continually engages in research related to product improvement. Some materials, production methods and designrefinements are introduced into existing products without notice as a routine expression of that philosophy. For thisreason, any current JBL product may differ in some respect from its published description, but will always equal orexceed the original design specifications unless otherwise stated.Compact Bi-AmplifiedThree-Way High DirectivityLine Array ElementApplication:The VT4887A Three-Way Line Array Elementis designed to deliver high-qualityreinforcement of music and speech in avariety of applications including concertaudio and corporate A/V presentations of alltypes for both portable users and fixedvenue installations.Key Features: Advanced technology components:Differential Drive®, neodymium magnet,dual voice coil, Direct Cooled™ conetransducers for low weight and highoutput. New 2168J-1 8" low frequency driversoffer improved performance andextended low frequency response Proprietary waveguides couple to createprecision HF vertical slot aperture Radiation Boundary Integrator ® (RBI):Patented technology integrates output ofindividual bandpass elements Advanced construction techniques usingJBL PlyMax ® engineered wood materialsprovide rigid, lightweight enclosure Rugged DuraFlex™ exterior finish;weatherized components Integrated S.A.F.E.™ suspension system:premium heat-treated alloys providerigid, reliable hanging arrays Pre-engineered to accept optionalamplified electronics package. Rear-panelmechanical attachments and electricalconnections ensure upgrade path forDrivePack™ self-powered systemmodules with integral signal processing For use in stand-alone arrays or incombination with other V ER TEC systemmodelsThe VT4887A is a rugged, compact andlightweight enclosure housing two 8"woofers, four 4" midrange radiators, andtwo high frequency compression drivers.VER TEC ’s advanced components provide anextremely high power-to-weight ratio.Enclosure features foam-backed lowfrequency grilles, dense protective foaminserts for midrange apertures and fine steelmesh grille to protect high-frequencyapertures. Speaker cones are treated withweather-resistant compounds.VER TEC arrays are rigid for maximumsupport strength, yet flexible in design andapplication. The VT4887A’s suspensionhardware relies on quick-release pins andend-mounted metal tubes to coupleadjacent VT4887A’s together. Rigging tubesmade of hard-black anodized 6061-T6Aluminum. Hinge bars made frompremium-grade chromoly alloy steel, withepoxy powder coating over plated surfaces.Plated hinge pins and stainless steel quick-release pin lanyards to resist corrosion andweather damage. Enclosure ships withintegral front and rear hinge bar set.Protective grille cover/wheel board and softcover ensure handy transport for roughroad conditions, (purchased separately asVT4887-ACC).V ER T EC ® Series