• Voice-coil overheating and burning due to
overexcursion is often caused by overdriving an
amplifier into “clipping.” A severely clipped signal,
or square wave, contains nearly twice the power
of a clean sine wave at the same level. Bass that
sounds broken up and distorted at higher volumes
usually indicates that the amplifier clipping (i.e.,
being asked to deliver power beyond its rated
power).
• Infinite-baffle or “free air” mounting applications
allow for greater cone excursion than subwoofers
mounted in an enclosure. In order to compensate,
recognize that the power-rating value of the sub-
woofer will likely be half its rated power in this
application.
• Study the excursion curves on the enclosed
Kappa series data sheet and note the differences
for different enclosure applications. The type and
size of box used will produce different excursion
demands on the enclosed subwoofer and, conse-
quently, different levels of power handling. As
long as recommended parameters are used the
subwoofer will perform properly in its enclosed
environment. However, any design deviation
may result in less than optimum performance and
may also subject the subwoofer to overexcursion
(i.e., where the voice coil leaves the gap) that can
eventually damage the speaker. For additional
help with this issue, please contact your autho-
rized Infinity dealer.
1
2
3
4
5
6
7
8
9
)
!
K
APPA
P
ERFECT
P
ERFORMANCE
In addition to keeping the voice coil in the
magnetic gap and ensuring uniform frequency
response throughout the speaker’s range of
excursion, an important factor for optimal sub-
woofer performance is distortion-free reproduc-
tion. Kappa Perfect subwoofers feature a number
of designed-in features that help to ensure these
three conditions.
1
Cast-Aluminum Basket – ensures perfect
alignment of speaker’s moving parts, provides
non-resonant frame and, because aluminum is
non-ferrous, the basket helps keep the magnet’s
flux in the gap.
2
Curvilinear™ aluminum cone and dustcap –
low mass for good transient response, rigid for
reduced distortion caused by cone flexing.
3
High-roll butyl surround – damps cone reso-
nance, ensures longevity.
4
Flat uniform-roll spider – ensures maximum
control over cone motion at the limits of the
speaker’s excursion, and reduces even-order
harmonic distortion compared to cupped spiders.
5
Thick top-plate – reduces the ability of musical
transients to push the coil past the magnetic gap
at high power levels.
6
1-1/2-inch-long four-layer voice coil – when
combined with stacked magnets (#7), provides
high motor force (BL) and ultralong excursion.
7
Stacked magnets – provide high motor force
(BL) and room for ultralong excursion
8
Vented voice-coil former and basket – provide
cooling for voice coil.
9
Extended pole piece and bottom plate –
large, radiused and polished pole-piece vent
reduces mechanical losses (Qms) and turbulence
at the vent’s mouth for improved low-frequency
extension free of mechanical noise. Extended pole
piece (above top plate) provides uniform flux
lines above and below the magnetic gap.
)
Insulated tinsel leads – protect against short
circuits at excursion limits.
!
Gold 5-way binding posts with standard
banana-plug spacing – accept high-end dual
banana plugs.
Kappa Perfect10 OM 9/15/98 5:01 PM Page 3
Summary of Contents for Perfect10
Page 1: ... KAPPASERIES ...
