Bedienungsanleitung Alpine SPX-Z18M (Seite 11 von 48) (Englisch, Französisch)

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Crossover Network Introduction

It is common knowledge that the automotive interior is one of the most inhospitable

environments for high-fidelity sound, and that every vehicle poses its own unique set of

installation and acoustic challenges. While many of these problems can often be over-

come with proper speaker placement, equalization, or other techniques, the attempt is

a time consuming task without guaranteed results. Yet with all these tools and methods

available, it is surprising to realize that one of the most powerful tuning tools has been

misunderstood or neglected by so many for so long. It is for this reason that Alpine has

developed the most advanced crossover network design in the history of car audio.

Much of the difference between demo-board and in-car performance can be attributed

to the fact that crossover networks have been traditionally tuned for only one specific

application – usually the demo-board. Without taking into account typical real world

installations, the transition between drivers and resultant frequency response will be

degraded for the majority of vehicles that installers are confronted with today. Through

Alpine’s unique phase coherent flat summation design methodology, however, it is now

possible to optimize performance for a variety of installations by intentionally altering

various filter characteristics. By achieving an “in-phase” condition between drivers in

the overlapping frequency range at the listening position, image smear, response aber-

rations and other typical problems can be dramatically reduced or eliminated altogether.

This “phase linkage” technique can be thought of as a kind of passive time correction in

the crossover region.

With Alpine’s introduction of such revolutionary processing technologies as digital time

correction and adaptive equalization, all of this may seem superlative. Unfortunately

however, such processing can significantly increase system complexity and therefore

may not be practical for every situation. Additionally, without careful use of time correc-

tion for each individual speaker in the system, integration problems between them can

remain. Subsequently, it may be advantageous to use such processing to compensate

for seating position bias in conjunction with the phase correction of the passive network

for the transition between individual drivers. Simply stated, the flexibility of the

AlpineF#1Status™ crossover network allows it to be a complimentary solution for achiev-

ing the best of both worlds, either as a stand alone solution or an integral component of

a partially active system.

As with all AlpineF#1Status™ products, it is the attention to the smallest details that

truly brings out ultimate performance... or in a word, MicroDynamics™. From the hand

coated crosscut wood fiber cones to the symmetric drive motor structures, nothing is

left to chance. This philosophy is carried throughout every aspect of the SPX-Z18T

speaker system, including the components, layout and design of the crossover network.

All series capacitors are the highest grade metalized polypropylene, and all series

inductors are heavy gauge air core. Even parallel inductors are of powder core con-

struction, to maximize consistancy and sound quality. All elements are intentionally placed

in such a way to as to minimize any chance for magnetic or thermal influence, and all

signal path lengths are minimized with extra heavy circuit board traces. In the end, this

level of quality and attention to detail has but one purpose, to bring true sonic realism to

the automotive environment once and for all.

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