User manual FENDER SPL 1225 MARK II

[. . . ] After moisture sealing, the Mk III Loudspeaker cabinets are covered in tough black indoor/outdoor synthetic carpet covering. Likewise, Mk III Loudspeaker cabinets also feature metal corners and rubber feet for a longer life and lasting looks. Only the finest components are used to provide maximum efficiency and response. In order to more fully understand the operational characteristics of your Mk III Series Loudspeaker enclosure, please read through this operational user's guide. Metal Corners and Rubber Feet Tough Indoor / Outdoor Synthetic Carpet Covering CAUTION: Almost all speakers produce strong magnetic fields which may interfere with the normal operation of nearby electronic devices, including televisions and computer video monitors. [. . . ] When speakers are connected in parallel, their combined impedance decreases. For speakers wired in series the opposite is true, their combined impedance increases. Thus, when speakers are wired in series, higher impedance speakers in the series draw more power from the amplifier than do speakers in the series with lower impedances. When speakers are wired in parallel, the opposite is true. Higher impedance speakers will draw less power from the amplifier than lower impedance speakers will draw. At Fender ®, we recommend connecting multiple speakers in parallel for several reasons. First, if one speaker fails, the others will continue to operate. Second, because in a series connection one speaker affects the output of the other speakers, unpredictable frequency response is a concern. Third, most speaker cabinets are already wired for parallel connections making parallel connections the most common wiring method. Below are two charts demonstrating how to calculate both parallel and series impedance. PARALLEL IMPEDANCE Zp = Cabinet B Impedance 16* 5. 3* 8 4 8 5. 3 1 1 1 1 + Z 1 Z 2 . . . Z n + + - Keep in mind, power and audio signal cables are the most common sources of sound system failure. Doing so will destroy the compression driver. Two speakers in a "loose pack" array requiring maximum horizontal coverage NOTE: When setting up your Mk III Series enclosures, be sure to place the cabinets in such a way as to minimize overlapping radiating patterns. A second consideration is for feedback and bass performance. If the speaker is placed near a large, flat wall, the bass output will increase by approximately 6 dB. Placing the speaker near a wall can cause feedback. If this occurs, the speaker must be moved. A third consideration is to what degree the speaker should be "heard and not seen", especially in permanent installations. Remember, where the speaker cabinets are placed will effect both their tone and radiating patterns. 5 BI-AMP OPERATION For versatility and increased headroom, some users may choose to use an active electronic crossover / processor, such as the Fender PCN-2 or PCN-4, with the system. The electronic crossover takes the place of the internal crossover of the speaker system. The "Normal / Bi-Amp" switch on the back of the cabinet must be set to the "Bi-Amp" position. Always check to ensure the internal/external crossover switch which selects passive or biamp operation is in the correct position prior to use. [. . . ] Always check to ensure the internal/external crossover switch which selects passive or biamp operation is in the correct position prior to use. Failure to do so may damage the speakers. A typical set-up of a bi-amp configuration is shown at right. For those situations requiring a subwoofer, Mk III loudspeakers can still be used if a three-way electronic crossover is used. [. . . ]