Infinity Prelude Forty Manual

Infinity Højttaler Prelude Forty

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Side 1/7

INFINITY®PRELUDE®FORTY

LOUDSPEAKER

OWNER’SGUIDE

INFINITY®PRELUDE®FORTY

This loudspeaker system represents a refinement of the principles that

have guided Infinity®loudspeaker designs for more than 40 years.

Loudspeaker development is generally an evolutionary process. New models

usually perform slightly better than the ones they replace. Over time, the

subtle advances add up and, when the latest model is compared to a loud-

speaker that is 10 or 12 years old, the improvement is unmistakable.

Every once in a while, a loudspeaker is developed that transcends this

pattern – its performance so remarkable, its design so stunning, its tech-

nology so advanced, it can truly be described as revolutionary.The new

Infinity Prelude

®Forty loudspeaker system is an elegant case in point.

The Infinity Prelude Forty 3-1/2-way design utilizes dual 8" CMMD

®woofers,

four patent-pending Maximum Radiating Surface

™(MRS™) mid-bass/midrange

drivers and an all-new 1" CMMD high-frequency driver. With its proprietary

Ceramic Metal Matrix Diaphragms,flat-panel MRS drivers and a sophisticated,

yet refined, crossover network, the Prelude Forty speaker will breathe

life into any musical performance and touch the soul of the listener. The

Infinity Prelude Forty system is one more landmark in a 40-year quest

to apply “science in the service of art.”

TECHNOLOGY

The Prelude Forty system incorporates several innovative technologies that,

when implemented by exceptional engineering talent after hours upon hours

of subjective listening evaluations, result in a loudspeaker that realistically

and accurately reproduces the signal source with minimal distortion

and coloration.

C MERAMIC ETAL MATRIX IAPHRAGMSD (CMMD®)

For decades, loudspeaker engineers have known that the ideal transducer

should be stiff, yet light, and have high internal damping (i.e., a material’s

ability to absorb energy).The Infinity CMMD transducer is a significant

advance in transducer technology. Ceramic offers better performance

than that of other materials. Ceramic is stiffer than metals and lighter

than plastics and typical composite materials, in addition to offering

improved damping.These ceramic-based transducers take us a giant

step closer to the ever-elusive “ideal transducer.”

CMMD technology offers accurate pistonic operation over the entire audible

frequency range of the driver, completely eliminating coloration due

to diaphragm breakup and dramatically reducing distortion. And when

ceramic-metal-matrix transducers are exposed to moisture, sunlight or

extreme temperatures, their performance does not deteriorate.

M RAXIMUM ADIATING SURFACE™(MRS™) DRIVERS

The appeal of flat-panel transducers has never been more obvious, and

the basic technology behind them is straightforward enough. But earlier

flat panels had performance limitations in the low frequencies, and were

prone to thermal compression. In developing the MRS transducers, Infinity

engineers incorporated new materials and technologies that have overcome

the drawbacks and deliver significant performance benefits.

CMMD TECHNOLOGY

Optimizing the parameters of the Prelude Forty flat-panel diaphragms

presented a serious engineering challenge. But by reinforcing the patented

Ceramic Metal Matrix Diaphragms with strategic ribs and gussets, Infinity

engineers were able to strike the perfect balance between electro-acoustic

efficiency and reliability.

DUAL ELLIPTICAL OILSVOICE C

Another flat-panel challenge was finding a way to uniformly drive as much

of the diaphragm’s radiating surface as possible.A traditional cone is only

driven by a small voice coil at its apex, but flat panels require a completely

different approach. Infinity engineers developed dual elliptical voice coils

for the MRS drivers. With more than six times the voice-coil contact of a

typical cone transducer, they move the diaphragm much like an ideal piston,

for superior operation throughout the driver’s entire frequency range.

GREATER ANGEDYNAMIC R

In addition to driving the flat diaphragm more uniformly, the dual elliptical

voice coils offer another benefit.The greatly increased surface area of

the coils allows them to dissipate heat more efficiently, reducing thermal

compression and dramatically increasing the speaker’s dynamic range.

The result is increased sonic clarity with reduced distortion.

TRANSDUCERS

In addition to CMMD technology, all the transducers incorporate advanced

neodymium motors that are inherently magnetically shielded.The 8" and

MRS frames are constructed of cast aluminum and have been optimized

to reduce resonances through proprietary FEA computer modeling and

scanning laser vibrometer measurements.This ensures minimal distortion

and incomparable performance.

The 8" low-frequency transducers are the embodiment of uncompromised

driver design.The ceramic-metalmatrix cone is attached to a rigid cast-

aluminum frame, through a compression-molded, butyl-rubber surround.

The motor assembly incorporates a vented polepiece for maximum heat

dissipation with negligible air turbulence.The motor structure uses a 2,"

edge-wound, copper voice coil for high power handling and minimal

power compression.

To maximize system performance, the flat-spider assembly and the cone are

mounted to different points on the fiberglass former, increasing reliability

and reducing distortion, especially at high output levels.An extra-thick top

plate and dual-magnet structure are utilized to allow for huge peak-to-peak

driver excursions, with significantly lower distortion and a more linear

frequency response than is true of typical drivers.

ROOM-FRIENDLY ACOUSTICAL ESIGND

Driver quality is not the only requirement for exceptional performance.

Infinity engineers understand that the room in which the loudspeaker

is placed can greatly affect its performance.To ensure that the Prelude

Forty system will sound exceptional in even the most unexceptional listening

environment, Infinity engineers have developed techniques to solve the

most serious room-generated problems having to do with loudspeaker

2INFINITY PRELUDE FORTY

Produkt Specifikationer

Mærke:	Infinity
Kategori:	Højttaler
Model:	Prelude Forty

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