Atlantic Technology In-Wall Loudspeakers Manual de usuario

343 Vanderbilt Ave Norwood, MA 02062 PH 781-762-6300 Fax 781-762-6868 www.atlantictechnology.com

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

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

343 Vanderbilt Ave Norwood, MA 02062 PH 781-762-6300 Fax 781-762-6868 www.atlantictechnology.com

that its smoothest response was 15

degrees down from straight ahead (aimed

right at the listener’s knees!), all because

you didn’t pay proper attention to lobing

behavior.

We all know that speakers lobe. So why

not take advantage of that fact instead of

fighting it? That’s what our exclusive

Directional Vector Control (DVC™) does.

By flipping the DVC switch to “on,” we

electronically manipulate the crossover so

that the speaker’s midrange output lobes

down about 15 degrees from the speaker.

This is perfect for when this speaker is

mounted above ear level and you want to

use them for front-channel LCR duty. The

midrange sounds—which determine

directionality and intelligibility—are directed

down at the seated listeners’ ears, even

though the speakers are six or seven feet

above the floor. The following graph shows

the measured response of this speaker at

the listening position; red is DVC off, blue

is DVC on.

Therefore, between the low crossover point

of LRT and the up-down midrange lobing

of the DVC, we’ve engineered a speaker

that covers the listening area more

effectively, without the drawbacks and

compromises of ordinary high-crossover

pivoting tweeters, and without having to

resort to the expense of a three-way

design.

We’ve also included a Boundary control to

compensate for the upper bass/lower

midrange buildup that occurs when a

speaker is mounted near a ceiling or wall

boundary, and there’s a three-position HF

level control to adjust tweeter level for

varying room acoustics.

_____________________________________

Steve Feinstein

Director of Marketing and Product Development

Atlantic Technology

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