Polk Audio EX340 Special Instructions, LOW Frequency CUT-OFF for Systems with Subwoofers

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).

FIG. 3	FIG. 4
EX340	Rotating
	Elliptical
	Lens

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. 5

Radiation

Pattern

FIG. 6

Bass

Blockers

USE TIN SNIPS TO REMOVE FLANGES

Radio/Amp

+

–

Bass blocker or capacitor

+

Speaker

–

6 Contact Polk Customer Service: 800-377-7655 polkcs@polkaudio.com For more info and accessories, visit www.polkaudio.com 7