CONSTRUCTION
In order to reach expected results, it's very important to follow these instructions. If you think you don't
have right tools or enough experience, please contact a professional installer. Be sure to wear right protec-
tive equipment during the construction.
To build the enclosure, we suggest to use MDF (Medium Density Fibre-board) panels, with thickness of 19
millimetres at least, jointed with a lot of vinyl glue. Pay attention that the enclosure doesn't present any splits:
this can affect the bass frequency response. After finished the box, put a lot of vinyl glue onto all internal
joints. Also, in order to eliminate every vibrations, you can apply dumping material on panel's internal side.
To realize the reflex vent, choose a PVC tube (like the ones used in building): it have to be firmly glued
to the enclosure.
Put a neoprene gasket with 2-3 millimetres of thickness (like the one used on windows) between box and
loudspeaker. Use the same gasket when the project requires removable panels.
To realize a subwoofer with several speakers, you just have to place side by side some boxes of the same
type (same speaker and same configuration).
INSTALLATION
Check the mounting location carefully, to avoid damages to the gas tank, electrical wires or hydraulic
pipes. Fix the subwoofer carefully on a steady surface, away from dust, moisture and moving objects.
Make you sure that the subwoofer never interferes with driving.
WIRINGS
In order to avoid possible damages, before starting connections, turn off car radio, amplifier and all elec-
trical devices in your audio system. Link the loudspeakers to the car radio by using high quality cable (3
millimeters section or more), keeping the polarities. Route all wires through a protection grummet; don't
put cable close to electronic devices, car wiring or heat-generating parts.
TUNING
Use the amplifier’s subwoofer output and adjust its low-pass control between 60 and 120 Hertz. If avail-
able, use the subsonic filter by setting its cut frequency around 30 Hertz. If the amplifier is equipped with
a phase control, adjust it in order to obtain the right sound.
The volumes of passenger compartment and car's trunk influence the bass frequency response and play an
important role on performances of the car audio system; also subwoofer linking phase influences acoustic
result: try to invert positive and negative wires of the subwoofer (out of phase), then choose the position
offering the best performances in your car.
Therefore, it's possible to adjust bass response by changing the subwoofer position or loudspeaker emit-
ting direction.