Compression Guide Technology
‐
History
‐
Con nued
For
example,
with
a
bass
guitar,
you
can
feel
the
pick
of
the
string
along
with
the
bass
note.
With
a
kick
drum,
you
could
hear
the
wrap
of
the
mallet
against
the
skin
of
the
drum
and
your
body
could
feel
the
impact.
However,
with
conven onal
speakers
all
you’d
hear
was
an
ill-
de
fi
ned
boom.
Back
then,
the
only
speakers
that
seemed
to
get
it
right
were
the
big,
bulky
and
expensive
transmission-line
systems.
We
needed
to
know
why
there
was
a
disparity
between
live
bass
and
that
reproduced
by
speakers.
A er
some
research,
it
became
apparent
that
the
problem
was
due
to
the
way
the
woofer
was
tuned
in
the
enclosure.
As
was
the
case
then
just
as
it
is
now,
2
tuning
methods
were
used
by
most
speaker
companies.
In
one
case
the
cabinet
was
completely
sealed.
This
method
is
called
acous c
suspension
or
air
suspension.
In
the
other
method,
the
cabinet
had
a
calculated
opening
called
a
vent
or
port.
The
length,
width
and
height
of
the
port
was
de-
signed
to
reinforce
bass
at
the
lowest
frequencies.
The
problem
with
both
of
these
methods
is
that
they
rely
on
system
resonance
to
properly
load
the
woofer.
System
resonance
acts
like
a
spring
in
that
once
the
note
stops,
the
woofer
cone
wants
to
con nue
vibra ng.
This
results
in
what
we
call
woofer
overhang
and
results
in
muddy
bass.
A er
realizing
the
problem,
we
spent
years
a emp ng
to
lessen
the
e
ff
ects
of
system
resonance.
Eventually,
we
found
the
solu on
and
the
results
were
spectacular.
We
call
it
Compression
Guide
and
it
was
a
method
of
dividing
the
insides
of
the
speaker
enclosure
into
areas
of
compression
and
expansion.
As
the
sound
wave
passed
through
these
areas,
the
e
ff
ects
of
resonance
were
greatly
reduced.
We
discovered
that
Compression
Guide
also
paid
huge
dividends
in
the
midrange
and
treble
as
well.
Bookshelf
speakers
tuned
by
Compression
Guide
exhibited
much
cleaner
and
trans-
parent
sound
with
both
vocals
and
music.
In
comparison,
other
bookshelf
speakers
sounded
“boxy”.
It
also
helped
the
speakers
to
image
more
accurately.
Standard Enclosure
Compression Guide Enclosure
3
Summary of Contents for Speedwoofer 10S
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