Sansui has
again challenged traditional thinking in speaker system design. And again the
results mean spectacular improvements in reproduced sound under actual
listening conditions in your home. The new LM Series represents not just a
revolution in design but a re-evaluation of high fidelity reproduction
standards as well. Another great step in the realistic world of musical sound.
The unique
multi-radiation baffle for the LM (Linear Motion) tweeter driver utilizes back
radiated sound energy to enhance the overall sense of perspective sound image
resolution and location in actual stereo application. It features three
exponential horns to channel some of the out-of-phase backradiated sounds of
the tweeter into the listening field. Essentially this unusual design
emphasizes certain phase difference relationships in multi-channel music to
give us a greater sense of stereo perspective. The fact that the
separately-baffled LM tweeter driver has very free movement against input
signals means better transient response too much better.
The proof of
these improvements is yours to enjoy in three LM models.
LM-110 (35 watts
peak),
LM-220 (45 watts peak)
LM-330
(60 watts peak).
Linear
Motion Tweeter Driver
The LM
Tweeter itself is a Sansui-exclusive Linear Motion Driver with a CCAW
(Copper-Clad Aluminum Wire) voice coil to reduce moving mass and help improve
transient response. The diaphragm features a steeply convex phase equalizer to
eliminate phase interference inside the cone for better high-end response.
Improved
Transient Response
Since the LM
Tweeter is mounted on a separate baffle, as explained below, it requires no
back cap or cavity to block out the strong and potentially damaging high
pressure waves created by the woofer in the enclosure. The die-cast aluminium
frame on the tweeter itself is ported to correspond to the three openings in
the multi-radiation baffle, and the tweeter diaphragm is free to move to and
fro in linear response to input signals with fast rise time. The result is free
Linear Motion in the air on in technical terms, better transient response. The
pure sounds of the LM Tweeter prove the
advantages over the blurred and muddy effects of less transient types at
first hearing.
MULTI
RADIATION BAFFLE
Three
Horn-Shaped Ports
The special
baffle for the LM Tweeter is mounted independently on the upper front of the LM
enclosure. As illustrated its three ports in the tweeter assembly to channel
the back-radiated sounds of the tweeter into the listening area in three
directions - left, right and up. After testing over thirty full-scale LM
prototypes, and the baffle as it appears here has been proven to emit just
enough sound information in the high frequency range to achieve the unusually
effective results .
Greater
Stereo perspective
The sense of
presence and ambience in stereo sound is much improved by the unique LM
approach of course. But it is in the precise sound-image location effect that
the new design truly shows its stuff. The emphasis on the difference in sound
pressure levels inn the respective channels means that any and all between the
channels sound images can be located exactly as they were intended by the
recording engineer.
Enlarging
each image as some speaker systems claim to do is not the answer to better
stereo perspective. The LM approach in fact makes each individual image smaller
with no loss in perceived level. In this way each has a more distinct focus or
identity, more breathing room, more personality. And when they are located
along the sterohorizot the perspective itself seems to widen and deepen as it
does in live listening conditions.
Natural
Response Woofer
The
low-frequency driver in the LM has a number of unusually advanced features for
mor natural bass respons, making it the perfect mate for the improved LM
Tweeter system.
The
superlight woofer cone is formed by a special non-press molding process and
features a unique multi-corrugation design to achieve for proper stiffness and
internal loss to create a living bass tone. To suspend this cone without
defeating its best qualities. Sansui engineers designed an accordion-crease
surround itself of appropriate stiffness and acoustical properties. The concave
equalizer in the throat of the cone is still another new Sansui design and it
serves perfectly to improve response near the crossover frequency. Finally, the
LM woofer features a particularly strong magnetic circuit and voice coil,
further extending the unit's ability to respond with linear motion to even
extremely high level input signals with proper damping for improved linearity.
Special
Crossover network
The
crossover network in each LM model uses a special high-permeability core
inductor to reduce DC resistance. This in turn provides a high damping factor
and holds distortion to 1,0% or below even when maximum (peak) power is
introduced. The non-polarized electrolytic type capacitors of particularly
lower energy loss in the high (above 10,000 Hz) frequency are 1,500 Hz and high frequency response can be adjusted
by a rear panel control.
Luxurious
Cabinet
Every LM
Series speaker system regardless of size or power- handling capacity is crafted
to blend harmoniously with all room decors. The polished walnut grained wood
cabinet is solidly built and expertly finished with pride and the trim,
pleasingly-textured front grille is a one-piece, removeable unit which protects
both the separately-mounted LM Tweeter and the woofer cone.
SPECIFICATIONS
LM-330
Speakers:
Woofer: 255
mm (10") Cone Type
Tweeter: 65
mm (2 ⁹/₁₆") Cone Type
Power
Rating: 60 watts (peak)
Impedance: 8 ohms
Sensitivity: 92 dB/W (New JIS 1 m)
Frequency
Range: 31 to 20,000 Hz
Crossover
Network: 2-way 12 dB/oct L-C Parallel
Type
Crossover
Frequency: 1,500 Hz
Finish: Simulated wood grain
Dimensions
(W x H x D): 310 x 710 x 304 mm (12-
1/8" x 28" x 12")
Weight: 18,7 kg (41,2 lbs) net, 20,7 kg (45,6 lbs)
packed