Polyglass Enclosures Manual
Connecting-up
Always check the polarity to the subwoofer, also the other speakers used in your installation.
The polarity is important to ensure the phase characteristics remain correct, otherwise a "loose" of
performance can result. The input terminals are clearly marked: RED spot = positive (+) and BLACK
spot = negative (-).
The SB 21 V2 uses a single coil; thus, there is one set of input terminals. For the SB 27 V2, SB 33 V2
and SB 40V2, these all use a double coil system, thus have 2x2 input terminals incorporated. Refer to
the diagrams shown to understand the various series
/
parallel connections available, to fully optimise
your chosen installation.
Adjustment of low cut off frequency
The cut off frequency of a subwoofer is normally in the region of 60 to 100Hz. This is always dependent
on the particular installation and listening position. A frequency of 80Hz is a good compromise for
effective bass compared to listening quality. Not every installation is the same, for this reason we
recommend you experiment and slowly adjust the filtering level, for your required listening pleasure.
Recommended power ratings
Polyglass subwoofer systems are already highly efficient, with improved sensitivity.
Therefore, their use with amplifiers rated between 250 to 400 Watts RMS is recommended.
Our subwoofers equally can accept power transistor aligned amplifiers between 500 to 800 Watts.
Attention
The improved power handling has allowed Focal subwoofers to play at very
loud sound volumes. Because of this, we recommend caution be wisely applied,
especially during long listening periods. Excessive volume levels of more than
110dB can cause permanent hearing damage.
7
Guarantee
In the unlikely event of any problem, please contact your Focal Audiomobile retailer.
Outside France, all Focal speakers are covered by the guarantee drawn up by the official Focal
distributor in your country. Your distributor can provide all details concerning the conditions of the
guarantee. Guarantee cover extends to the minimum legal period, provided in the country where the
original purchase invoice was issued.
notice caisson polyglass 7
11/02/04, 14:08:09
