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NHT bookshelf
speakers are acoustic suspension designs
that use nature's perfect spring force...
air... to control the cone motion
instead of a heavy, unpredictable
mechanical suspension. It takes a
little more development time and amplifier
power to do an acoustic suspension
design justice, but the greatly decreased
distortion, deeper bass response,
and increased detail are well worth
it
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Fig 1. This
is clearly demonstrated in the "impulse
response" test where a speaker
is sent a momentary pulse and then
observing the resulting "ringing".
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Fig 2. Notice how the midrange is
cut sharply as the listener moves
farther off-axis.
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While
small, 2-way three-driver center speakers
are very popular, this design is really
more about creating a low profile
speaker than one that’s suited
for center channel use. A traditional
center’s frequency response
changes hugely as the listener moves
away from the cabinet’s center.
This dramatic dip in the critical
midrange is clearly visible in Figure
3. NHT’s 3-way design, detailed
in Figure 4 below, eliminates this
huge dip, ensuring that every seat
in your home theater is the best seat
in the house
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Fig
3. NHT’s three way design maintains
smooth response over a much wider listening
area. |
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While the Classic series of products
are certainly beautiful, their shape
is all about the business of making
great sound. The graceful cabinets
place every driver into a consistent,
predictable acoustical environment.
For example, variable radius edges
on the cabinet sides randomize diffraction
from the midrange and tweeter drivers,
aiding the speakers dispersion of
midrange and high frequency sounds,
while careful placement of the Four's
built-in subwoofer guarantees tremendous
deep bass response in almost any room.
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Our cabinets are
made with MDF, a board manufactured
primarily of wood residues from the
production of lumber and plywood with
a low percentage of virgin tree wood.
We finish them with 7 coats of hand-finished
polyurethane applied in a "solid
particle" method that's safe
for the environment. This finish is
then sealed with 2 coats of automotive
grade clear- coat to protect the finish
for years. By avoiding exotic wood
veneers, and using materials such
as MDF in the construction of our
cabinets, we're not sacrificing scarce
natural resources to make acoustically
sound, furniture grade cabinets.
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A subwoofer
is the most difficult speaker in your
system to find a home for. Subwoofers
are often placed where they look best
in the room, not where they sound
best. Placement in a corner can make
the bass boom while moving it away
from the walls can rob your system
of the deepest bass. With NHT's exclusive
Boundary EQ control placement and
performance can finally coexist.
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By using two low distortion drivers
mounted close together on a single
plate, we are able to produce a
speaker with a larger listening
area, lower distortion, and higher
power handling than previous 2-way
designs
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All of the 5.25"
and 6.5" woofers in the Classic
line feature frames made from BMC
(Bulk Molding Compound). Usually a
designer has to choose between inexpensive,
mechanically sound materials such
as ABS plastic and stamped steel,
or expensive materials such as machined
aluminum or magnesium that are ideal
acoustically and mechanically. BMC
gives us the best of both worlds:
a material that is immensely stiff,
and easily shaped into acoustically
ideal shapes.
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