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Xb

X-Array™ Bass System

• Unprecedented acoustic output in

a small, lightweight package

• Ring-Mode Decoupling (RMD)™

provides accurate transient detail

• EVX-180B woofers
• Unique rear-hinge rigging
• Enclosure shell and rigging

identical to all of the full-size
X-Array™ systems

Description

The X-Array

 product line represents im-

portant advancements in concert-sound rein-

forcement technology. The design goals

called for the highest acoustic output capa-

bility with the highest fidelity in lightweight,

compact enclosures that were easy to array.

The development began with a clean sheet

of paper and took an integrated approach.

The individual loudspeaker drivers, horns,

enclosures, rigging hardware and system

configurations were designed from the

ground up specifically for this high-perfor-

mance application.

The Xb is a manifolded, vented-box bass

system utilizing two 457-mm (18-in.) woof-

ers. The two woofers face each other in a

manifold chamber at the center of the en-

closure. This manifolding technique (U.S.

Patent Number 4,733,749) increases the

acoustic loading, resulting in increased low-

frequency efficiency (at and slightly above

box tuning) and reduced distortion compared

to conventional direct-radiating designs. The

woofers were designed as part of the Xb

development and represent a step forward

in state-of-the-art loudspeaker design in

terms of high acoustic output with low

distortion and low power compression.

Electro-Voice engineers developed a new

technology dubbed Ring-Mode Decoupling

(RMD

) to substantially improve clarity and

intelligibility by reducing both linear and

nonlinear resonance modes that color the

sound.

The low-frequency driver in the Xb is the

EVX-180B. An improved version of the in-

dustry-standard EVX-180A high-excursion

467-mm (18-in.) woofer that has distin-

guished itself as an industry standard for

high-power, low-frequency reproduction.

During the X-Array

 development, the ther-

mal conduction of the motor was improved

and the suspension was redesigned, giving

the EVX-180B even lower power compres-

sion and a longer mechanical lifetime. In the

Xb, the woofers are manifolded in a vented

enclosure optimized for maximized output

from 37-160 Hz with minimized distortion.

Ring-Mode Decoupling, (RMD

), is a tech-

nique utilized and named by Electro-Voice

to describe a process used to improve sound

quality in loudspeaker systems. RMD offers

a solution to a very fundamental problem. It

has long been recognized that two different

loudspeaker systems can sound different

even though they both may be equalized to

have the same frequency response. This dif-

ference is due to a variety of resonances, or

ring modes that color the sound. Although

this ringing may be very low in level com-

pared to the program material, it is still au-

dible. The source of these resonances may

be mechanical or acoustical in nature, or a

combination of both. In addition, they may

be linear or nonlinear, resulting in their char-

acter changing with level. Furthermore, these

ring-modes may be aggravated when mul-

tiple loudspeaker enclosures are assembled

into arrays. The result is a coloration that de-

creases intelligibility and clarity, with the

nature of that coloration varying with level.

Often, the listener perceives that coloration

as imbalance in the frequency response, and

will attempt to electronically adjust the sys-

tem to restore the spectral balance. However

this electronic equalization has the negative

effect of changing the program material

itself.

Ring-Mode Decoupling (RMD

) addresses

mechanical resonances with mechanical

solutions, and acoustical resonances with

acoustical solutions. In the Xb development,

RMD was applied at every level – to the in-

dividual LF drivers, the LF enclosure cham-

bers and the interaction between multiple en-

closures. The design process included, for

example, the driver cone, suspension geom-

etry and materials, enclosure geometry and

materials, absorptive materials, etc. The re-

sult is a dramatic improvement in clarity and

with a much more neutral sound (a lack of

coloration) with the loudspeaker system

maintaining its sonic integrity from the very-

lowest sound pressure levels to the very-

Содержание X-Array XB

Страница 1: ...nsion was redesigned giving the EVX 180B even lower power compres sion and a longer mechanical lifetime In the Xb the woofers are manifolded in a vented enclosure optimized for maximized output from 37 160 Hz with minimized distortion Ring Mode Decoupling RMD is a tech nique utilized and named by Electro Voice to describe a process used to improve sound quality in loudspeaker systems RMD offers a ...

Страница 2: ...d to be used with other X Array systems for a full range response as an active system that requires an active electronic crossover Both the Electro Voice Dx38 and Klark Teknik DN8000 digital crossovers are recommended for signal control See the Crossover Equalization and Signal Delay Controller section The Electro Voice P3000 amplifier is recom mended for powering the Xb See the Amplifier Recommen...

Страница 3: ...ps avail able include those for linking two enclosures together securing the top enclosure in a col umn to a and for picking up the top enclo sure in a column without a grid Consult the X Array Accessories section for a complete listing of the available rigging accessories The total weight of a column of X Array loudspeaker systems that may be supported by the X Array rigging system varies from 45...

Страница 4: ...a Ave Hollywood CA 90068 USA 213 850 5042 or ATM Fly ware 2100 S Wilmington Ave Carson CA 90810 USA 310 834 5914 Electronic Accessories Klark Teknik DN8000 Digital Controller The DN8000 digital electronic loudspeaker controller has a two in five out architecture with each output having programmable high pass and low pass filters four band equal ization signal delay compressor limiter and noise gat...

Страница 5: ...tate Electro Voice Speakers and Speaker Sys tems are guaranteed against malfunction due to defects in materials or workmanship for a period of five 5 years from the date of origi nal purchase The Limited Warranty does not apply to burned voice coils or malfunc tions such as cone and or coil damage re sulting from improperly designed enclo sures Electro Voice active electronics asso ciated with the...

Страница 6: ...was applied to the mid band of the low frequency section The sound pressure level was normalized for an equivalent one meter distance Figure 3 Beamwidth The beamwidth of the Xb i e the included horizontal and vertical coverage angles at the 6 dB points was measured with a full spherical measurement system as de scribed in Figure 1 DIRECTIVITY FACTOR R θ Q Without Crossover and EQ With Crossover an...

Страница 7: ...tal electronic unit was used to provide the necessary crossover filters equalization and time de lay The sound pressure level was normal ized for an equivalent one meter distance Plots of second and third harmonic distor tion are shown referenced to the funda mental Figure 6 Impedance The impedance of each frequency band of the Xb was measured in an anechoic environment Figure 7 Wiring Diagram The...

Страница 8: ...200 Hz Average see Figure 4 2 2 0 8 0 4 Directivity Index Di 63 200 Hz Average see Figure 4 3 4 dB 1 4 dB 0 9 dB Distortion 115 dB SPL at one meter shaped spectrum see Figure 5 Second Harmonic 40 Hz 2 2 80 Hz 0 9 Third Harmonic 40 Hz 0 4 80 Hz 0 2 Transducer Complement Two EVX 180B 18 in woofers Impedance see Figure 6 Nominal Two 8 ohm loads Minimum Two 6 4 ohm loads Input Connections Two Neutrik ...

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