JBL VT4887A Manual

VT4887A
V T ® Series
ER EC
Application:
The VT4887A Three-Way Line Array Element
is designed to deliver high-quality
reinforcement of music and speech in a
variety of applications including concert
audio and corporate A/V presentations of all
types for both portable users and fixed
venue installations.

Key Features:

Advanced technology components:
Differential Drive ® , neodymium magnet,
dual voice coil, Direct Cooled™ cone
transducers for low weight and high
output.
New 2168J-1 8" low frequency drivers
offer improved performance and
extended low frequency response
Proprietary waveguides couple to create
precision HF vertical slot aperture
Radiation Boundary Integrator
Patented technology integrates output of
individual bandpass elements
Advanced construction techniques using
JBL PlyMax ® engineered wood materials
provide rigid, lightweight enclosure
Rugged DuraFlex™ exterior finish;
weatherized components
Integrated S.A.F.E.™ suspension system:
premium heat-treated alloys provide
rigid, reliable hanging arrays
Pre-engineered to accept optional
amplified electronics package. Rear-panel
mechanical attachments and electrical
connections ensure upgrade path for
DrivePack™ self-powered system
modules with integral signal processing
For use in stand-alone arrays or in
combination with other V
ER
models
The VT4887A is a rugged, compact and
lightweight enclosure housing two 8"
woofers, four 4" midrange radiators, and
two high frequency compression drivers.
V T 's advanced components provide an
ER EC
extremely high power-to-weight ratio.
Enclosure features foam-backed low
frequency grilles, dense protective foam
inserts for midrange apertures and fine steel
mesh grille to protect high-frequency
apertures. Speaker cones are treated with
weather-resistant compounds.
V T arrays are rigid for maximum
ER EC
support strength, yet flexible in design and
application. The VT4887A's suspension
hardware relies on quick-release pins and
end-mounted metal tubes to couple
adjacent VT4887A's together. Rigging tubes
made of hard-black anodized 6061-T6
Aluminum. Hinge bars made from
premium-grade chromoly alloy steel, with
epoxy powder coating over plated surfaces.
Plated hinge pins and stainless steel quick-
release pin lanyards to resist corrosion and
weather damage. Enclosure ships with
integral front and rear hinge bar set.
Protective grille cover/wheel board and soft
cover ensure handy transport for rough
road conditions, (purchased separately as
VT4887-ACC).
® (RBI):
Specifications:
Line Array Element
Frequency Range (-10 dB): 55 Hz – 22 kHz
Frequency Response (+/- 3 dB): 67 Hz – 20 kHz
Horizontal Coverage Angle (-6 dB): 100 degrees nominal (500 Hz – 16 kHz)
Vertical Coverage Angle (-6 dB): Varies with array size and configuration
System Input Power Rating: LF: 1000 W Continuous, 4000 W Peak (AES / 2 hour)
Recommended Amplification: LF: 1000 – 2000 W into 8 ohms
Recommended Signal Processing: dbx
Transducer Sections
T system
EC
Bandpass Nominal Impedance: 8 ohms (16 ohms each transducer, wired in parallel)
Bandpass Nominal Impedance: 8 ohms (drivers wired in series-parallel, passive network)
Enclosure
1 Calculated maximum SPL based on rated peak power and measured sensitivity
2 AES Standard, one decade pink noise with 6 dB crest factor within device's operational band, free air. Standard AES 2 hr
rating plus long term 100 hr rating are specified for cone transducers
JBL continually engages in research related to product improvement. Some materials, production methods and design
refinements are introduced into existing products without notice as a routine expression of that philosophy. For this
reason, any current JBL product may differ in some respect from its published description, but will always equal or
exceed the original design specifications unless otherwise stated.
Compact Bi-Amplified
Three-Way High Directivity
Line Array Element
MF/HF: 225 W Continuous, 900 W Peak (AES / 2 hour)
Maximum Peak Output 1 : 131 to 141 dB SPL, 1m (frequency/bandpass dependent)
MF/HF: 450 – 900 W into 8 ohms
®
Digital System Controllers supported
Low Frequency: Two 2168J-1, 203 mm (8 in) dia., 76 mm (3 in) Dual Coil,
neodymium Differential Drive
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 coil
HIGH: Two 2408H, 25 mm (1 in) exit compression driver,
38 mm (1.5 in) voice coil
Input Power Rating : 225 W Continuous, 900 W Peak (100 hour)
2
Bandpass Sensitivity: 103 dB, 1W / 1m (2.83 Vrms at 3.3 ft)
Box Construction: Wedge frustum 5 degree side angle enclosure. PlyMax
engineered wood composite structure, DuraFlex
2 handles with integrated LF ports
Suspension System: S.A.F.E. hardware, integral hinge bars nest in rigging
tubes on box ends. Quick release pins with restraining
lanyards. Set of 4 hinge bars included. Suspend with
VT4887-AF or VT4887-SF Array Frame.
Grille: Black perforated steel, foam backed
Input Connectors: Neutrik
Lows & Pin 4+/- for Mid-Highs
Dimensions (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)
4800, Crown ® I-Tech, BSS FDS-366T, and other
® , Direct Cooled™
® Speakon ® NL-8 and NL-4 (2x each), Pin 3+/- for
®
finish,
TM