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BUILDING YOUR OWN ENCLOSURE
On the reverse side of this page are guidelines for the construction
of two types of vented enclosures. Both types will work well with
your woofer. The Flatest Response type will provide you with the
smallest enlcosure while the SPL type will require a larger enclosure
but provide louder output.
If you decide to build your own enclosure, we strongly recommend
that you "measure twice" and "cut once" - that is, always double
check your measurements.
Enclosures should be constructed from MDF or particle board of at
least 3/4" thickness. Be sure to glue and screw or staple your en-
closure tightly - your box must be air-tight to operate properly and
efficiently. Use Elemer's brand or similar "carpenters' glue." Internal
braces are also recommended.
The specifications page describes two sizes of enclosure for slot-
ted and circular applications, but many others are possible. Become
knowledgeable on the subject and you will be able to design other
types of enclosures by plugging in the parameters supplied in this
guide. Feel free to call our technical assistance line for custom box
designs, or download the free box building software from "
http://www.linearteam.dk/default.aspx/?pageid=winisd
Don't forget to leave a donation.
ABOUT THE SPECIFICATIONS
All FS measurements are for NEW woofers. You can expect the Fs to
drop by at least 5Hz after a few hours of play.
Enclosure measurements INLCUDE woofer and port displacement.
F-3 down points are calculated by computer which models the F-3
in free air response. Typically you can expect the actual 3dB down
point to be at least 10Hz lower for actual in-car response.
SPL efficiency measurements listed are done in our labs and are not
to be considered an indicator of a woofer's loudness once installed
in an enclosure and powered by an amplifier.
Specifications and measurements in this document are subject to
change without notice.
ABOUT THE SPECIFICATIONS
The enclosure dimensions provided may be adjusted to suit your vehicle layout, but follow our guidelines for enclosure VOLUME. For example, if
the suggested dimensions for an enclosure are 12"W x 16"H x 14"D, multiplying these dimensions together will yield the volume in cubic inches,
which can be divided by 1728 to yield the volume in cubic feet. If your vehicle cannot accommodate the 16" height but a 12" will fit, add the 4"
difference to the width or the depth. Check your math to see if the new dimensions multiply out to the saame volume.
If the port length recommended is too long to fit into your enclosure, you can bend the port in order to attain the desired length.
The suggested SLOT port sizes are based on the enclosure height, allowing you to add the port by simply reducing the size of the front panel of
the enclosure by the wodth of the prot and adding in a single piece of wood left to right in the enclosure, starting at the front panel and continuing
toward the back by recommended slot depth.
For SLOT ports, you can adjust the H and W dimensions as long as the cross-sectional area of the opening remains the same. For example, if
the recommended port cross section is 1.5" x 12.2", you can change this to (for example) 3.0" x 6.1" or 4.5" x 3.05". In all these cases, the cross-
sectional area of the port is 18.3 square inches.
VOICE COIL WIRING DIAGRAMS
PARALLEL:
SINGLE VOICE COIL
SPEAKERS
+
+
IMPEDANCE @
AMPLIFIER =
-
2 OHMS
-
+
+
IMPEDANCE @
AMPLIFIER =
4 OHMS
-
-
+
4
4
OHM
OHM
-
+
8
8
OHM
OHM
-
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