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EX340 SPECIAL INSTRUCTIONS
EX340 models have flanges that can be removed to facilitate easy placement in tight spots, such as in
some import vehicles (FIG. 3). Remove only the flange(s) that are necessary to make the speaker fit the
chosen location. Secure the speaker with at least two opposing flanges. In some vehicles, you may have
to bend or angle (but not break) one of the two flanges to get the proper fit when installing the speakers
in your dashboard. To remove flanges, use tin snips. Do not use a sander or grinder, as that could cause
fine metal shavings to fall into the voice coil and driver suspension units.
AIMING THE ROTATING ELLIPTICAL LENS FOR OPTIMAL PERFORMANCE
EX3 Series speakers (except EX369) feature a Rotating Elliptical Lens (REL) mounted on the tweeter
(FIG. 4). This lens allows you to customize your system’s response by focusing high frequencies at your
listening position. This will result in more detail, better imaging and the best possible high frequency
performance in your vehicle. Aim the REL while listening to a piece of music that you are familiar with.
To aim the Rotating Elliptical Lens, simply rotate it to direct the high frequency energy toward your
listening position (FIGS. 4 & 5). To avoid “bright” highs, aim the REL away from hard reflective
surfaces (glass or hard plastic panels).
LOW FREQUENCY CUT-OFF FOR SYSTEMS WITH SUBWOOFERS
If you have a subwoofer in your system, you may want to decrease the amount of bass frequencies
going to your mid-range speakers (which is what your “full range” speakers would be if you had a
subwoofer in your system). Doing this will result in better mid-range detail and increased power
handling. There are two ways to roll off the bass before it gets to your mid-range speakers. One way is to
use a “bass blocker,” a capacitor placed in series with the speaker input. Bass blockers are installed in
series, one end connected with the positive lead from your amplifier and the other end connected to the
positive lead of each of your speakers (FIG. 6). Bass blocker capacitors (200 microfarad @ 100volts,
non-polarized) are available at most car stereo dealers, RadioShack and parts supply stores. The other
route is to use an electronic crossover device that allows filtering below 100Hz or so. You can find these
devices at your authorized Polk Audio dealer.
FIG. 4
Rotating
Elliptical
Lens
FIG. 5
Radiation
Pattern
Radio/Amp Speaker
Bass blocker
or capacitor
++
––
FIG. 6
Bass
Blockers
For more info and accessories, visit www.polkaudio.com
FIG. 3
EX340
USE TIN SNIPS TO REMOVE FLANGES