JBL HLA 4895 Manuel utilisateur

HLA 4895 & 4897

Horn Loaded Array

System Owner Manual

Cover photo taken at Werchter Music Festival July 5, 1997. EML Belgium provided 48 HLA 4895s and

24 HLA 4897s for coverage of 50,000 European music fans. Photo credit: Bill Gelow; Guy Hawley photo model.

Table of Contents

Section 1. Introduction and system overview Page 12

Section 2. Getting started with system setup Page 13

Section 3. Using system controllers Page 17

Section 4. Matching transducers to power amplifiers Page 15

Section 5. Input / output connector panels and cabling Page 17

Section 6. HLA system array design setups Page 19

Section 7. Hanging and rigging information for HLA arrays Page 29

Section 8. System transport and truck-pack information Page 32

Section 9. System maintenance and repair tips Page 35

Appendix A, HLA Polarity Issues Page 42

Appendix B, DSC280 system controller settings Page 43

Appendix C, Available JBL parts and accessories Page 44

Appendix D, Supplemental Info - ATM Fly-WareTM Page 45

Appendix E, Additional information resources Page 46

Appendix F, Typical HLA Array Setups Page 47

HLA System Owner Manual

Section 1. - INTRODUCTION AND SYSTEM OVERVIEW

Congratulations on purchasing the latest in sound reinforcement speaker technology from JBL

Professional. HLA’s high acoustical power output capabilities and pattern-controlled coverage characteristics

allow fewer speakers to achieve superior results with significant weight savings when compared to systems that

rely on traditional speaker technology. HLA’s superior performance is derived from not one, but a collection of

several new technologies, each offering a unique advantage over conventional speaker designs.

HLA’s New Technologies

Differential Coil Drive (DCD) New voice coil and motor assemblies have twice the thermal surface area of

traditional speakers. This enables HLA systems to provide higher peak output with less power compression, better

heat dissipation and a flatter impedance curve at higher frequencies. These transducers are one-third the weight

of a traditional speaker, with 16-ohm impedance ratings which enable more efficient use of today’s high-powered

amplifiers.

Direct cooling of DCD drivers provides a simple method for greater thermal transfer of heat away from the voice

coil. This allows for long-term high-power operation.

Composite magazine A non-wood speaker enclosure made of space-age man-made material contributes lighter

overall system weight and improved rigidity. Benefits include better transducer loading for low distortion, direct

cooling, and weather resistance.

MultiBand WaveguideTM Triple-section horn combines low, midrange and high-frequency waveguides into a

single device, offering wide-band acoustical pattern control with low distortion, and reduced interference from

adjacent elements. The benefit: better-sounding loudspeaker arrays.

SpaceframeTM A rigid aluminum frame structure that distributes weight and lifting stress, enabling pull tests of

25,000 pounds (11,400 kg) without failure or structural deformation. The Waveguide is tiltable within

Spaceframe.

Linear Dynamics ApertureTM Contoured subwoofer ports virtually eliminate high-level turbulence found in

traditional subwoofer port designs. At 25 Hz, this provides for 8 dB less port compression at full output, and offers

3 dB greater output than conventional subwoofers. Approximately one-half the number of HLA Model 4897

subwoofers will typically be required for equivalent acoustical output compared to conventional subwoofers.

Any of the above technical innovations would give a sound system a competitive advantage. JBL’s HLA

system combines them to provide an unprecedented high-performance package for portable sound

reinforcement.

Section 2. - GETTING STARTED WITH SYSTEM SETUP

The 4895 three-way HLA full-range speaker has a shipping weight of 230 pounds (105 kg). The 4897

dual-eighteen HLA subwoofer speaker, shipping weight of 240 pounds (110 kg). Both speakers are shipped

wrapped in cardboard and fit two per shipping pallet. At least one 4897 subwoofer is recommended for every two

4895 full-range speakers.

Wheel Bars (HLA-WHEELS) are used for moving portable or touring HLA speaker systems. Each speaker

can be ordered with pairs of Wheel Bars for use in moving HLA speakers from the truck or storage to the position

in the venue where the array will be assembled.

A Wheel Bar is a 34-inch (86 cm) long L-shaped aluminum extrusion with two wheel-castors

mounted. Two Wheel Bars slide into guides along each side of the bottom of the speaker from the back. Wheel

Bars are shipped in pairs in a cardboard box weighing 25 lbs. (11 kg).

Connecting and lifting hardware

Connecting Bars (HLA-CB) are used in pairs to link one speaker to another. With one speaker

suspended above another, a Connecting Bar slides into both speakers’ guides, one Connecting Bar on each side.

Two Connecting Bars are needed for every speaker that is not in the top row of a speaker array.

Lifting Bars (HLA-LB) are used in pairs to connect each speaker in the top row of an array to the

individual Truss Module above it with 1/2-inch screw pin anchor (SPA) Shackles. Lifting Bars slide into the two

guides on either side of the top of the speaker and each has two reinforced holes to accept suspension clips, or

Shackles. Two Lifting Bars are needed for every speaker in the top row of a hanging speaker array. This is the only

approved method for hanging HLA speakers. Four 1/2-inch SPA Shackles or load-rated safety-hook assemblies

can be used to attach an HLA-LB to the Truss Module above it (see Section 6, “Hanging and rigging information

for HLA arrays”).

HLA Model 4895 Three-Way HLA Model 4897 Subwoofer

HLA-CB (Connecting Bar) HLA-CA, HLA-LB, and HLA-WHEELS

Connecting Bars and Lifting Bars are both black I-shaped aluminum bars that are 2.5 inches (6 cm)

tall, 3/16 inches (5 mm) thick and 34 inches (86 cm) long. Lifting Bars and Connecting Bars are sold by JBL in

pairs. Shipping weight is 7 lbs. (3 kg) per pair.

Speaker input signals: the system controller

The recommended system controller is the DSC280 Digital System Controller, which provides

processing for a stereo HLA speaker system. It is factory-loaded with presets that include the correct adjustments

for several different array configurations. The DSC280 is two rack-spaces (3.5 inches) high, 14 inches (36 cm)

deep and weighs 16 lbs. (7 kg). (See Section 3, “Using System Controllers”).

The back panel of the DSC280 has 2 female XLR input connectors, and two sets of four male XLR

output connectors, one for each band pass of a stereo system, for a total of 8 male XLR outputs. If the DSC280 is

located close to the power amplifiers, 8 short XLR cables will connect them.

If the DSC280 is located at a control position removed from the amplifiers’ location, 8 balanced (3-

wire) cables are needed to connect them. This can be accomplished using 8 XLR return lines in the microphone

snake, or preferably by using a separate, dedicated multi-pair cable with at least 8 channels total, terminating

inside the racks with XLR connectors.

A stereo HLA system requires 8 distinct channels of amplification, two channels for each band-pass

output. The subs, lows, midrange and high-frequency amplifier channels should be able to cleanly provide a

minimum of 1,600, 2,400, 1,600 and 800 watts respectively into four ohm loads. Three stereo amplifiers with

sufficient power, one each for lows, mids and highs, will work with eight 4895 three-way speakers, driving four

16-ohm transducers on each channel. Two additional amplifiers will power four 4897 subs, with two 8-ohm

transducers on each channel. Five amplifiers running 4-ohm loads can power a basic HLA block of eight 4895

speakers and four 4897 subs if the amplifiers can provide the required power for each type of transducer (See

Section 4, “Matching transducers to power amplifiers”).

Typical HLA System Configuration showing controller, amplifiers and loudspeakers

HLA Series Basic Module

One Channel Shown

Output D

Output C

Output B

Output A

MPA600, Stereo mode

MPX1200, Stereo mode

MPX1200, Bridged mode

MPX1200, Bridged Mode

Spare Amplifier Channels to be used for additional Speakers

JBL 4895

JBL 4897

Loop-through Connections

The HLA 4895 speakers and 4897 subwoofers come standard with Neutrik NL-8 Speakon connectors.

The NL-8 Speakon connector has four pairs of speaker connections, but the two speaker models have different

circuit assignments. A different but identical speaker cable can be used for the two kinds of HLA speakers. Each

4897 sub-woofer is cabled individually to its amplifier channel. Note: only one of every four 4895 three-way

speakers must be cabled to the amplifiers. Up to three more 4895 speakers can be connected in parallel to the

first with short jumper cables. Speaker cables that will reach from the amp rack are needed for each 4895

subwoofer. Only one speaker cable that will reach from the amp rack is needed for one of every four 4895

speakers, and short jumpers are used to connect the remaining three out of four 4895 speakers together in

parallel.

Section 3. - USING SYSTEM CONTROLLERS

JBL’s HLA system requires the use of precision-adjusted system controllers for best results. These devices

combine crossover, signal delay, equalization and limiting functions in a single digitally-controlled analog signal

processing package.

The DSC280 system controller from JBL Professional is recommended for use with the HLA system.

Alternatively, a pair of DSC260 system controllers can be used, or a single DSC260 can be used for 4895’s in fill or

delay speaker applications.

DSC280 Digital System Controller DSC260 Digital System Controller

Using the Model DSC280 Digital System Controller

The DSC280 is a stereo 4-way programmable speaker controller with 60 memory locations. Refer to the

DSC-280 User Manual for complete operating instructions.

On the left of the front panel of the unit, each output has 8-segment LED signal meters and a mute

switch. On the right is the control screen surrounded by its menu keys, function keys, and cursor control.

The Edit key at the bottom right steps through the four display screens for each preset. The Utility key

displays the utility menu that corresponds to each of the four display screens. The Menu keys to the left of the

screen are assigned functions that are labeled on each screen. The Store and Recall keys are also used for

comparing changes made while in Edit mode

There are two switches that control the left and right linking of control. Users are cautioned against

accidentally adjusting only side of the system by inadvertently touching both buttons at once. To operate both

sides of a stereo system in the same manner, make sure that both the “L” and “R” indicators are lit at all times.

Multiple system files

The DSC280 digital controller has 60 user-programmable memories and files with pre-programmed

settings for different JBL products. HLA pre-sets are stored starting in memory location 20. The memory number

is indicated in the upper left corner of the display screen. Each of these files is set to fine tune the system for

particular configurations. Memory locations for different configurations of HLA arrays:

DSC280 Memory # 12 13 14 15 16 17

Array HLA HLA HLA HLA HLA HLA

Configuration SML 2x2 2x3 3x3 4x4 4x4

(4895 + 4897) 1 + 1 2 + 2 4 + 2 6 + 3 10+6 10+10 (extra subs)

The first preset in location #12 has less HF boost for shorter-distance applications of one 4895 and one

4897, intended for small-space demonstration only. Subsequent presets are for longer-distance, actual use

situations. Other presets can easily be configured by recalling one that is close to the desired performance

characteristics and then modifying it. For example, a preset for a 6 + 3 array (six 4895 speakers and three 4897

subwoofers) can be created by recalling location #15 (6 + 3) and then adjusting the output gain levels of each

crossover bandpass (lows, mids, highs, etc.) as required. Note that system tuning in DSC280 Memory Location

#17 is the same 4x4 array as in #16, but with additional subwoofers on the ground.

DSC280 Display Screen

Four display screens.

There is one default display screen that shows the combined response curves of the output bands, plus

three more display screens for inspecting and adjusting delay, equalization, and crossover parameters. Each band

output has parameters for setting parametric EQ, delay, phase and polarity. Some of these are used to pre-set the

system and, along with the crossover parameters, are locked in system software. Parameters that are critical to

HLA performance are locked into the OEM program and blanked out from being displayed.

Delay Display.

The delay screen has adjustments for individual Band outputs and the overall system delay, since the

subwoofers may not always be placed in alignment with the 4895 three-way speaker and thus could need minor

adjustments. The signal delay adjustments for the three transducers in the 4895 three-way speaker are linked and

locked, since all three transducers are physically aligned in the same speaker.

Four Utility Menus.

Each of the four display screens (Main, Delay, EQ and Xover) has its own utility menu screen for

inspecting and modifying additional parameters related to each display screen. From the Delay utility menu,

units for delay adjustment can be selected as milliseconds (ms), feet (ft) or meters (m).

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