valutazioni - 2, GPA: 3.5
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Third, most speaker cabinets SPEAKER WIRE LENGTH (30.5 m-UP) are already wired for parallel connections making parallel 50'-100' connections the most common wiring method. (15.25-30.5 m) Below are two charts demonstrating how to calculate *25'-50' both parallel and series impedance. (7.60-15.25 m) 10'-25' PARALLEL IMPEDANCE 1 (3.05-7.60 m) Z = p 1 11 + 5.3* 8 4 5.3 8W *16W Cabinet A + + - + -A B- Impedance *Example- Cabinet A is 8 ohms. Cabinet B is 16 ohms . The total impedance when connected in parallel is: 1Z p = = 5.3 ohms. 8W 11 + 8 16 Impedance Cabinet B (0.00-3.05 m) 4W *8W 16. SPEAKER IMPEDANCE [z] *Example - If the speaker wire length required is between 25-50 feet (7.60 15.25 meters) and the speaker impedance is 8W , the minimum recommended speaker wire gauge is 16. AWG Cross- Section [mm ]2 Resistance in W per foot (30.5 cm) @ 77. F (25. C) 18 0.83 .00651 16 1.32 .00409 14 2.10 .00258 12 3.32 .00162 10 5.27 .00102 8 8.38 .00064 SERIES IMPEDANCE * 18 20* 24 32 10 12 16 24 6 8 12 20 4 6 10 18 Z Z +Z ...Z 16W = 1 2 s n Impedance + - + - + - B A Cabinet B 8W 4W 2W 2W 4W *8W 16W Cabinet A Impedance *Example- Cabinet A is 4 ohms. Cabinet B is 16 ohms. The total impedance when connected in series is 4 + 16 = 20 ohms. 4 5 The 1/4" jacks are wired in parallel allowing any one of the jacks to be used as an input and the other as an output. This allows "daisy chaining" of multiple loudspeakers, eliminating the need for several long, cumbersome runs of speaker cable. The connections are as follows: Polarity Phone Jack Positive (+) Tip Negative (-) Sleeve Connect the amplifier to the loudspeaker with a minimum 16 gauge wire when a length of no more than 100 feet is used. When multiple speakers are “daisy chained” together or where longer cable runs are encountered, use a larger gauge wire. Although no harm or hazard will result, using too small a gauge of wire may cause the sound quality and level to degrade. 1272X /1275X cabinets are covered in a tough, black indoor/outdoor synthetic carpet for long life and lasting good looks. To clean the carpet covering, simply vacuum away any smudges or dirt. For stubborn stains, use a light soapy solution or carpet shampoo with a brush. Avoid spilling liquids on the input panel, grille and speakers. The placement of any speaker can affect its sound. Thus, there are several considerations to review when placing your 1272X /1275X monitor. CAUTION! When operating with large amplifiers (greater than 150 watts at 4 ohms) always set the level control between the 3 o’clock and 5 o’clock positions. Failure to do so may lead to overheating and damage the level control. 1) When using stage monitor systems, the reduction of feedback is probably the most important criteria. The best way to reduce feedback is to use a CARDIOID pattern microphone with it’s rear aimed at the loudspeaker. Remember: Do not cover the side or top slots of the microphone with your hands as this could cause feedback. 2) Select a 30 or 60 degree angle based upon the working distance that you will need. A 30 degree angle is preferable for performers who require a greater working distance from the monitor so that movement about the stage is on axis with the monitor. A 60 degree angle is preferable for performers who have a shorter working distance and who do not move around the stage. 3) When larger movements are expected, 1272X /1275X monitors may be used as side fill monitors so that wide horizontal coverage can be provided. If used in the side fill position, it may be advantageous to elevate the speaker from the floor to keep it aimed at the performer’s ear level. The side fill position at about 10 to 15 feet from the performer is particularly useful for drummers and keyboard players. This allows program monitoring while keeping the monitor clear of your equipment. In the side fill position, the drummer’s / keyboardist’s vocal microphone can be positioned to the side allowing the rear of the microphone to face the front of the monitor minimizing feedback. 1272X /1275X SPEAKER CONNECTIONS SETUP SUGGESTIONS CARPET COVERING CARE SPECIFICATIONS SPECIFICATIONS TYPE PR 395 PR 396 MODEL 1272X 1275X PART NUMBER 071-1272-200 071-1275-200 CABINET 3/4" (1.9 cm) 3/4" (1.9 cm) Particle Board Particle Board CONNECTIONS (2) 1/4" Phone Jacks (2) 1/4" Phone Jacks DRIVERS Low: 12" (30.5 cm) woofer 15" (38 cm) woofer 2" (5.1 cm) voice coil 2" (5.1 cm) voice coil High: Dual Piezoelectric Dual Piezoelectric FREQUENCY On Axis, RESPONSE Half Space 60 Hz to 20kHz 50 Hz to 20kHz +/- 6 dB ON AXIS SPL @ SENSITIVITY 1W/1m: 95 dB 95 dB COVERAGE Vertical 70. @ 5 kHz 70. @ 5 kHz PATTERN Horizontal 35. @ 5 kHz 35. @ 5 kHz POWER RATING 200W program 200W program 100W EIA RS 426A 100W EIA RS 426A NOMINAL IMPEDANCE 16. 16. DIMENSIONS Height 17.3" (43.9 cm) 19.2" (48.8 cm) Width 22.2" (56.4 cm) 25.2" (64.0 cm) Depth 13.8" (35.1 cm) 15.8 (40.1 cm) WEIGHT 37 lbs. (16.8 kg) 47 lbs. (21.4 kg) A PRODUCT OF: FENDER MUSICAL INSTRUMENTS CORP. CORONA, ...
Questo manuale è adatto anche per i modelli :E-libri - PA 1272X (212.1 kb)