Atlantic Technology 5018SL Брошюра

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Atlantic Technology Innovations for In-Wall Loudspeakers

Low-Resonance Tweeter (LRT™) and Directional Vector Control (DVC™)

It is obvious that people choose in-walls

because they don't want to see speaker

boxes in their room. Furthermore, most

people mount in-walls high off the floor—

above the sight line—again, because

people don't want to see the speakers. The

result of this is that much of the sound is

focused above the listener's head and

distorted in terms of the frequency

response balance of the sound reaching

the listener's ears.

Previous attempts to compensate for this

non-optimal positioning have used some

variant of the "pivoting tweeter" approach.

But pivoting tweeters don't work very well.

Here's why: two-way tweeters cross over

too high in frequency—about 3,500-4,000

Hz—so it is the woofer, not the tweeter,

that plays most of the midrange, and it's

the midrange that your ear uses to

determine directionality.

Woofers beam badly in the upper

midrange. If the woofer is above ear level,

it's going to beam the upper midrange like

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a flashlight right over the listener's head.

The so-called "pivoting tweeter" is not

much help, because it doesn't play the

midrange! And to make matters worse,

when you pivot a tweeter, you introduce a

ledge or shelf that diffracts the tweeter's

output and smears the propagation of the

treble frequencies.

It's a messy,

inelegant solution

that probably does

more harm than

good.

So here's what we

did instead: We

modified our

tweeter so it can

play lower

frequencies; far

down into the midrange, about a full octave

lower than a conventional tweeter to

around 2,000 Hz. It's a very highly-

engineered tweeter system with a vented

backplate, playing into its own sub-

enclosure (complete with internal stuffing!),

and special heat-sinking. We call it the

Low-Resonance Tweeter (LRT™). Now the

woofer doesn't have to struggle to reach

into the upper midrange, and we get a

much smoother blend of radiation

coverage angles as we transition from the

woofer to the tweeter.

One of the characteristics of speaker

performance is what engineers call

"lobing." A speaker's output will lobe up or

down, depending on things like crossover

topology, driver positioning, etc. It can be

very frustrating to develop, say, a new 35-

inch tall floor-standing speaker and find