Focal K2 POWER Serie Manuel D'utilisation page 11

Installation
Running-in period
K2 Power subwoofers incorporate the
very latest components. To ensure
such complex mechanical elements
work in harmony with the rest of
your system, they must be allowed to
function correctly in this environment.
Such changes in temperature and
humidity are regarded as very hostile.
For K2 Power subwoofers to benefit,
a running-in period must be used to
ensure they are prepared for this. We
recommend that once the system is
ready for listening the subwoofers
should be run-in at medium volume
setting. The use of audio material
that contains good low frequencies
is ideal to gain their full potential.
We recommend this running period
be used for at least one week. After
which the excellent performance of
your K2 Power subwoofers can be
fully appreciated.
Fitting
Each subwoofer kit comes complete
with its fixing kit. This consists of self-
tapping wood screws, metal inserts
and threaded bolts, plus a reel of
foam gasket material.
Depending on whether the subwoofer
is to be installed standard recessed
flush-fit or inverted, requires careful
examination before any cutting is
attempted for example a rear panel
installation (fig. A). The desired baffle
location or custom made enclosure
must be rigid and strong enough to
hold the weight of the driver. We
recommend the sealing gasket is
attached to the driver, then the driver
placed into position and attached
securely in place.
Connecting-up (general)
It is imperative the correct connection
is always maintained to the subwoofer.
The correct phase is important,
especially when integrating it into
a broad-bandwidth or component
speaker system; such in the case of
a 2 or 3 way set up. Not doing so
will drastically reduce the overall
performance.
Connection to the subwoofer use
the standardised system of, RED =
positive +, and BLACK = negative -.
This must be followed and inverted
if the driver is installed in the reverse
(inverted install).
For those subwoofers with twin (33 KX
and 40 KX) or quadruple connection
(46 KX 4), careful understanding of
the various parallel and series circuits
must be determined first, by verifying
compatibility with the amplifier load
characteristics, and overall system
integration.
Connections (27 KX)
The 27 KX subwoofer uses a single
4 ohms voice coil, thus consists of a
single input terminal (fig. B). Verify the
output stage and if your amplifier has
a bridging function, to gain further
benefit, use it. Ensure it is compatible
with a 4 ohms impedance load.
Connections (33 KX and 40 KX)
Both 33 KX and 40 KX subwoofers,
use a dual voice coil, thus each
consist of two input connectors. To
achieve high power integration to
your system, we recommend the
two connectors, are connected in a
parallel circuit formation (fig. C). In
this situation, an impedance load of
approximately 1 ohms will be present.
For connection to the amplifier, it is
important to ensure such low load
is compatible. It is also possible to
connect the voice coil into a series
type circuit, producing an impedance
load of approximately 4 ohms (fig. D).
This is generally recommended if your
amplifier is not compatible to low load
impedances of less that 1 ohms. The
33 KX and 40 KX can also benefit from
"Bi-amping" configurations (fig. E). It
is important to ensure both amplifiers
are of the same specification and
power rating. Also a traditional 2
channel stereo amplifier (high power
recommended) can also be used,
allowing further installation flexibility.
11 English