Owner’s manual
GB
Dear Customers,
Our compliments for purchasing a product of Hertz
HI-ENERGY
line. Our satisfaction
is the first requirement our products must meet, the same satisfaction as that of those
who long for the emotion of car audio.
If correctly installed, this component will give you extraordinary listening pleasure.
Please carefully follow the instructions you will find in this manual in order to exploit
these speakers qualities at best.
In order to build high quality, hi-fi car systems, you need to know the cars mechanic
and acoustic problems well; if you think not to have the right tools or the necessary
experience, please contact a specialised installer. A state-of-the-art installation will
insure you thrilling performances without affecting your car safety and reliability.
Caution
H
ERTZ
HI-ENERGY S
UBWOOFERS CAN GENERATE VERY HIGH UNDISTORTED SOUND
PRESSURE
. L
ONG EXPOSURE TO EXCESSIVELY HIGH SOUND PRESSURE LEVEL MAY DAMAGE
YOUR HEARING
;
THEREFORE
,
PLEASE USE COMMON SENSE AND PRATICE SAFE SOUND
.
In order to promptly face possible emergency situations, you should always be able
to hear the noise generated by your car or coming from the outside; safety must
be at the first place while driving.
Recommendations
Hertz
HI-ENERGY HX
speakers were designed to integrate their acoustic response
with the latest cars compartment response; therefore, they are perfectly suitable to
customised, complex installations.
Let us remind you that the speaker is not a complete element: the system it is
used into, the way it is installed and the system tuning will directly affect acoustic
performances and reliability. The speaker warranty is void if the product is used
in wrong or improper ways. Below, you will find some useful tips; please contact
your dealer for any doubts.
Technology
HI-ENERGY HX
subwoofers are the highest technological innovation in terms of
low frequencies reproduction. These speakers were designed and optimised in order
to reproduce the very first octaves of the audio spectrum with precision, impact
and power, with minimum size requirements in any configurations.
Their very long, linear excursion permits to get high sound pressure levels even in
quite small boxes.
Their electro-acoustic parameters make them fit different types of boxes, both
sealed and vented.
HX
subwoofers can also be used as free air; however, please remind that this
kind of configuration does not control cone in any ways and it is affected by the
installation quality. The maximum pressure you can get with this configuration is
therefore less; thus, we recommend to pay utmost care to mounting, in order to
avoid breathing and pressure losses.
Find your box
(see page Find your box)
We recommend six configurations for
HX
subwoofers, with different size requirements,
complexity and acoustic results.
All projects were optimised considering the use of a panel of absorbing material, like
AZ audiocomp FONOFORM, onto all internal walls, both in sealed and reflex enclosures.
If you want to create a bass section by using several speakers, we recommend you
to use the same subwoofer model and the same type of box. Build some equal boxes,
one for every subwoofer, or design a single structure divided in different boxes.
Connecting your subwoofer
(see page Connecting your subwoofer)
HX
series offers single voice coil and double voice coil subwoofers. This permits
you to have a more flexible subwoofer section, to change the way speakers are
connected and their number, in order to make load suitable to the amplifier.
Usually, car amplifiers power output increases when load decreases. Among the
manufacturer’s specifications, please check the minimum impedance the amplifier
accepts and don’t go below it.
When using two or more speakers in the subwoofer section, it is extremely important
to employ drivers of the same type (model and number of voice coils), installed
in the same type of box. We herewith show different combinations of connection in
series, in parallel and mixed (in series - in parallel), which meet most needs in terms
of load impedance and maximum sound pressure. Below, please find the formulas
for calculating impedance according to the type of connection.
Connections in series
Total impedance =
Ω
Sub 1
+
Ω
Sub 2
+
Ω
Sub 3
…
Connections in parallel
Total impedance =
Practical recommendations
When building your subwoofer box, you’d better care for some details:
•
You need to get a perfect match between the speaker and the box it has to be put
into; always use a gasket between basket and mounting surface, fasten screws
gradually and simultaneously.
•
Use the rubber inserts given with the subwoofer in order to cosmetically
complete the screws housing after fastening them. See page Installation patterns -
Mounting.
•
The box panels must be perfectly glued and sealed; use a lot of good quality vynil
glue, evenly distributed onto touching surfaces.
•
To prevent all breathing, you can put a paste of vynil glue and saw dust (the one
you get while working, for instance) onto all internal joints.
•
Use damping materials, like AZ audiocomp FONOMAT, onto internal walls in order
to eliminate vibrations.
•
Build your box of rigid, anti-vibration material not to compromise the project
acoustic performances: use high-density wood, MDF, multilayer sea wood, etc.
where “
Ω
Sub” is the impedance
of Subwoofer number 1 etc. …
1
1
Ω
Sub 1
1
Ω
Sub 2
1
Ω
Sub 3
…
…
Содержание HI-ENERGY HX 250
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