JBL VT4889-1 User Manual

Fullsize Three-Way High Directivity

VT4889-1

VERTEC® Series

Application:

The VT4889-1 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 ﬁ xed venue installations.

Key Features:

䉴 Advanced construction techniques and JBL

PlyMax™ engineered wood materials provide rigid, yet lightweight enclosure

䉴 Advanced technology components: Differential

Drive®, neodymium magnet, dual voice coil, Direct Cooled™ cone transducers for low weight and high output.

䉴 Industry’s smallest, lightest, most powerful 1.5˝

exit, 3˝ diaphragm high frequency compression driver

䉴 Proprietary waveguides couple to create

precision HF vertical slot aperture

䉴 Radiation Boundary Integrator® (RBI): Patented

technology integrates output of individual bandpass elements

䉴 Rugged DuraFlex™ exterior ﬁ nish; weatherized

components

䉴 Integrated S.A.F.E.™ suspension system:

premium heat-treated alloys provide rigid, reliable hanging arrays

䉴 Pre-engineered to accept optional ampliﬁ ed

electronics package. Rear-panel mechanical attachments and electrical connections ensure upgrade path for DrivePack™ self-powered system modules with integral signal processing

The above features come together in a line array system with performance advantages offering beneﬁ ts for both portable system users and ﬁ xed-venue installations. The VT4889-1 combines time tested acoustical physics with JBL’s innovative transducer research and design in a premium-grade system package. JBL’s V (Vertical Technology) builds on proven line array theory as demonstrated in JBL’s line array systems in the early 1970’s. The VT4889-1 is a rugged, lightweight enclosure housing two 15˝ woofers, four 8˝ midrange radiators, and three high frequency compression drivers. Extremely high power-to-weight ratio.

The PlyMax™ enclosure features foam-backed low frequency grilles, dense protective foam inserts for midrange apertures, and a ﬁ ne steel mesh grille to protect high-frequency apertures. All speaker cones are treated with weatherresistant compounds. Rigging frames and hinge bars are made from premium-grade chromoly alloy steel, with epoxy powder coating over plated surfaces; hinge pins are plated and quickrelease pin restraining lanyards are stainless steel to resist corrosion and weather damage. V arrays are rigid for maximum support strength, yet ﬂ exible in design and application. The VT4889-1’s release pins and end-mounted metal frames to couple adjacent VT4889-1’s together. Enclosure ships with available front and rear hinge bar set (VT4889-RIG). Available padded soft bag and protective grille cover/wheel-board ensure handy transport for rough road conditions (purchased separately as VT4889-1-ACC).

suspension hardware relies on quick-

ERTEC

Line Array Element

Speciﬁ cations:

Line Array Element

Frequency Range (-10 dB): 40 Hz - 18 kHz Frequency Response (+/- 3 dB): 45 Hz - 16 kHz Horizontal Coverage Angle (-6 dB): 90 degrees nominal (250 Hz - 16 kHz) Vertical Coverage Angle (-6 dB): Varies with array size and conﬁ guration System Input Power Rating: LF: 2000 W Continuous, 8000 W Peak (AES / 2 hour)

Maximum Peak Output

Recommended Ampliﬁ cation: LF: 2 x 1000 - 2000 W into 8 ohms (2 x LF transducers

Recommended Signal Processing: dbx

Transducer Sections

Low Frequency: Two 2255H, 380 mm (15 in) dia., 76 mm (3 in) dual coil,

Bandpass Nominal Impedance: 2 x 8 ohms (LF transducers wired individually) Input Power Rating (each driver)

Bandpass Sensitivity: 99 dB, 1W / 1m (2.83 Vrms at 3.3 ft) Mid Frequency: Four 2250H, 203 mm (8 in) dia., 76 mm (3 in) dual coil,

Bandpass Nominal Impedance: 8 ohms (MF transducers wired in series parallel) Input Power Rating

Bandpass Sensitivity: 102 dB, 1W / 1m (2.83 Vrms at 3.3 ft) High Frequency: Three 2435H, 76 mm (3 in) diameter beryllium diaphragm,

Bandpass Nominal Impedance: 16 ohms (HF drivers wired in series) Input Power Rating: 225 W Continuous, 900 W Peak (AES / 2 hour) Bandpass Sensitivity: 116 dB, 1W / 1m (2.83 Vrms at 3.3 ft)

Enclosure

Box Construction: Wedge frustum 5 degree side angle enclosure. PlyMax™

Suspension System: S.A.F.E. hardware, integral hinge bars nest in rigging

Grille: Separate LF and HF, black perforated steel. LF grilles foam

Input Connectors: Neutrik

Dimensions (W x H x D): 1213 mm x 489 mm x 546 mm

Net Weight: 79.8 kg (176 lb) Shipping Weight: 86.2 kg (190 lb)

Calculated maximum SPL based on rated peak power and measured sensitivity

AES Standard one decade pink noise with 6 dB crest factor within devices operational band, free air. Standard AES 2 hr rating

plus tong term 100 hr rating are speciﬁ ed for cone transducers.

JBL continually engages in research related to product improvement. Some materials, production methods and design reﬁ nements 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 speciﬁ cations unless otherwise stated.

MF: 1400 W Continuous, 5600 W Peak (AES / 2 hour) HF: 225 W Continuous, 900 W Peak (AES / 2 hour)

: 138 to 146 dB SPL, 1m (frequency/bandpass dependent)

powered independently) MF: 1400 - 2800 W into 8 ohms HF: 450 - 900 W into 8 ohms

4800, Crown® I-Tech, BSS FDS-366T, and other

Digital System Controllers supported

Neodymium Differential Drive

: 2 x 1000 W Continuous, 2 x 4000 W Peak (AES / 2 hour)

2 x 650 W Continuous, 2 x 2600 W Peak (100 hour)

Neodymium Differential Drive

: 1400 W Continuous, 5600 W Peak (AES / 2 hour)

1200 W Continuous, 4800 W Peak (100 hour)

38 mm (1.5 in) throat diameter Neodymium compression drivers

engineered wood composite structure, DuraFlex™ ﬁ nish, 10 handles

frames on box ends. Quick release pins with restraining lanyards. Set of 4 hinge bars included. Suspend with VT4889-AF or VT4889-SF Array Frame.

backed

Speakon® NL-8 (2x) Pins 1+/- & 2+/- for Lows,

Pin 3+/- for Mids, Pin 4+/- for Highs

(47.8 in x 19.3 in x 21 in)

, Direct Cooled™

䉴 VT4889-1 Fullsize Three-Way High Directivity Line Array Element

360

100

Vertical

-6 dB Beamwidth (degrees)

Normalized Frequency Response (Individual bandpasses with composite overlay)

360

20 100 1000 10000 20000

Vertical Beamwidth, Single Line Array Element

360

Frequency (Hz)

100

Horizontal

-6 dB Beamwidth (degrees)

20 100 1000 10000 20000

Frequency (Hz)

Horizontal Beamwidth, Single Element and Typical Array

VT4889-1 Acoustical Measurements

The acoustical performance of line array elements must be considered within the context of a multi-box vertical array, in which format they are designed to be used. The frequency response measurement shows individual bandpass responses with composite response overlay. The Vertical Beamwidth results range from a single box up to an 8-box array with 10° splay angles between adjacent array elements. All measurements provided herewith are derived from data gathered with a calibrated measurement microphone centered on-axis of the box or array, with polar data points taken symmetrically around the measurement axis. All polars were taken as groundplane measurements at a distance of 20 meters, with data gathered on 5-degree intervals from 0-355° using the MLSSA measurement system.

100

Vertical

-6 dB Beamwidth (degrees)

20 100 1000 10000 20000

Frequency (Hz)

Vertical Beamwidth, Two Element Array (10° splay between cabinets)

360

100

Vertical

-6 dB Beamwidth (degrees)

20 100 1000 10000 20000

Frequency (Hz)

Vertical Beamwidth, Four Element Array (10° splay between cabinets)

360

100

1213 mm (47.75 in)

546 mm (21.5 in)

489 mm

(19.25 in)

403 mm

(15.88 in)

System Dimensions (WxHxD): 1213 mm x 489 mm x 546 mm

Including attached suspension hardware

Vertical

-6 dB Beamwidth (degrees)

20 100 1000 10000 20000

Frequency (Hz)

Vertical Beamwidth, Six Element Array (10° splay between cabinets)

360

100

Vertical

-6 dB Beamwidth (degrees)

20 100 1000 10000 20000

Frequency (Hz)

Vertical Beamwidth, Eight Element Array (10° splay between cabinets)

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