Owner's Manual
Table Of Contents
ACCESS
SUBWOOFERS
_U_s_e_r
_M_a_n_u_a_I
_
Congratulations on choosing Focal automobile vented box.
To
gain the best results tl'
-n
your
speaker, please ensure
you
follow these recommendations, and keep carefully this user manual
so
that
you
can consult it later. If not followed correctly any fault observed may not be covered
by the guarantee.
Cables
For optimum performance the
use
of
OFC
cable (Oxygen
Free
Cablel, to a sufficient thickness (2.5mm
L
)
is
highly recommended.
This
is
particularly important
in
the case
of
long cable lengths being used
in
the
installation.
We
recommend the
use
of
Focal cables
FC500
or
FC700. Check with your local Focal dealer for
further advice.
Connecting up
Always check the polarity to the subwoofer, and that
of
the other speakers
used
in
your installation.
The
polarity
is
important to ensure the phase characteristics remain correct, otherwise a "loss"
of
performance can result.
The spring action input terminals are clearly marked red spot
= positive (+) and black spot = negative
(-).
These subwoofers can
be
mounted
in
the traditional
sense
with the membrane on view externally,
or
inverted
mounting with the motor unit and
its
chrome back plate on display. Inverted mounting helps increasing the
volume for the given space available. When choosing inverted mounting the phase must be inverted (thus swap
the positive / to negative connections)
so
that the polarity
is
correctly observed.
""
Warning
~
The
30
A1
DB
subwoofer
uses
two voice coils
of
4 Ohms each.
Please
refer to cage 3 to connect
this product.
Multi-subwoofer installations
To
obtain a more powerful acoustic presence,
we
recommend the introduction of multiple subwoofers for your
chosen installation. Using multiple subwoofers, various series
or
parallel
or
combinations
of
both can
be
used,
but always check the specifications
of
the power source (amplifier) before attempting any installation.
It
is
worth
remembering if low impedance
of
2
or
even 1 ohm
is
chosen an amplifier
of
high quality should always
be
used for such installation.
Connections
in
parallel
Normally the terminal positive (+) on the subwoofer will
be
connected to the equally marked positive (+) on
the amplifier, and the terminal negative
(-)
on the subwoofer to the equally marked negative
(-)
on the amplif,e'
Calculation
of
the impedance
is
(Z),
for the given impedance value nominal
(R),
is
4 ohms.
• 2 subwoofers:
l/Z
=
1/R1
+ 1/R2 Z= 2 Q
• 3 subwoofers :
l/Z
= 1/R1 + 1/R2 + 1/R3 Z =
1,33
Q
THE
FOCAL GUARANTEE ONLY
APPLIES
IF
PAGE
31
IS
I
RETURNED
TO
US
WITHIN
10
DAYS
OF PURCHASE.
I~.
i::fr
-1--"--
_
..
-
I
CE:
Focal®
is
a trademark of
Focal·JMlab®
.
BP
374
-
108,
rue
de
I'Avenir
. 42353
La
Talaudiere
cedex·
France
-
Tel.
(+33)
04
77
43
57
00 •
Fax
(+33)
04
77
43
57
04
. www.focal-fr.com
t h t" S D i r 1 I 0 f
Sou
n d
Due to constant technological advances, Focal
reserves
its
right to modify specifications without notice. Images may not conform exactly to specific produd.