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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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