User manual FENDER 1225 MKIII

[. . . ] Your sound system is far more than just a combination of dials, wires and speakers. It is an integral part of the audio chain and should be treated with special care and attention to detail. Fender knows what building quality musical instruments and sound reinforcement equipment is all about. [. . . ] 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. 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. Well made and carefully maintained cables are essential to the reliability of the entire sound system. If long speaker cables are required, it is important to ensure the cable`s gauge is sufficient to transfer all of the available amplifier power to the speakers rather than absorbing the power itself. As a rule of thumb, larger wires are better as they conduct more power to the speakers (larger wire has smaller gauge numbers). Below are two charts listing speaker wire gauges and recommendations for best results. SPEAKER WIRE GAUGE SPEAKER WIRE LENGTH 100'-UP (30. 5 m-UP) 10 12 12 14 14 16 18 18 18 50'-100' (15. 25-30. 5 m) *25'-50' (7. 60-15. 25 m) 14 *16 16 18 18 18 10'-25' (3. 05-7. 60 m) 0'-10' (0. 00-3. 05 m) A B 4 *8 16 SPEAKER IMPEDANCE [z] *Example - If the speaker wire length required is between 25-50 feet (7. 6015. 25 meters) and the speaker impedance is 8, the minimum recommended speaker wire gauge is 16. 8* 16 Cabinet A Impedance + - *Example- Cabinet A is 8 ohms. 1 1 8 + 16 SERIES IMPEDANCE 16* Cabinet B Impedance 8 4 2 18 10 6 4 20* 12 8 6 24 16 12 10 32 24 20 18 + Z s = Z + Z . . . Z 1 2 n + + - Resistance in per foot AWG Section (30. 5 cm) @ 77º F (25º C) 2 [mm ] Cross- 18 16 14 12 10 8 0. 83 1. 32 2. 10 3. 32 5. 27 8. 38 . 00651 . 00409 . 00258 . 00162 . 00102 . 00064 A B 2 4* 8 16 Cabinet A Impedance *Example- Cabinet A is 4 ohms. The total impedance when connected in series is 4 + 16 = 20 ohms. 4 Mk III SERIES SPEAKER CONNECTIONS In normal operation (using the passive internal crossover), the 1/4" jacks and the Speakon TM Connectors are wired in parallel allowing any one of the connectors to be used as an input and any other as an output. This allows "daisy chaining" of multiple loudspeakers, eliminating the need for several long, cumbersome runs of speaker cable. During normal mode, the connections are as follows: Polarity Positive (+) Negative (-) Phone Jack Tip Sleeve SpeakonTM 1+ and/or 2+ 1- and/or 2- SETUP SUGGESTIONS The placement of any speaker can dramatically affect its sound. [. . . ] The crossover frequency, for both the 1225 Mk III / 1226 Mk III, should be set at approximately 2200 Hz, the 1211 Mk III should be set at approximately 1200 Hz. Since the output sensitivity of the compression driver is higher than that of the woofer, the high frequency output of the system must be decreased at either the crossover (if such a control is provided) or at the power amplifier(s) that are used for the high frequencies. CAUTION: Be sure to connect the high frequencies and low frequencies to their correct inputs indicated on the back of the speaker cabinets. UNPOWERED MIXER MAIN OUT MONITOR OUT IN PCN-2 ELECTRONIC CROSSOVER HIGH OUT LOW OUT A In B In SPL-9000 POWER AMP A Out B Out Hi Mk III Cabinet Low SWITCHES SET TO EXTERNAL CROSSOVER Hi Mk III Cabinet Low Speakers operated in a bi-amp configuration CARPET COVERING CARE Mk III Series cabinets are covered in a tough, black indoor/outdoor synthetic carpet for long life and lasting good looks. [. . . ]