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Anleitung Zusammenfassung
For example, in Figure 4, each woofer you should design a speaker system will have an impedance of 12 ohms, by based on the RMS power handling of The JBL A6000GTi and A3000GTi your speakers. For music with sharp Ztotal = Z1 + Z2 = 6 + 6 = 12 amplifiers support a wide range of transient bass notes (e.g., rock, and the three woofers connected country or jazz), the RMS power impedances, and any speaker system in parallel will have an equivalent handling rating is conservative, and with a total or equivalent impedance of impedance of 4 ohms, by you can count on your speakers being either amplifier. In order to connect Zequivalent = 1/(1/Z1 + 1/Z2 + 1/Z3) able to handle more power than the 1 to 4 ohms will extract full power from Figure 3. Parallel connection of two = 1/(1/12 + 1/12 + 1/12) multiple woofers to the A6000GTi or RMS rating. 4-ohm voice coils yields a total = 1/(3/12) A3000GTi, you’ll need to connect your impedance of 2 ohms. = 12/3 = 4 speakers in series, parallel or series-The total power output of your parallel. We’ve included diagrams for amplifier will be divided among the DUAL VOICE-COIL each connection scheme and a pair of NOTE: All subwoofers connected to an speakers connected to it. For example, CONNECTIONS amplifier in a system must be identical formulas, which will help you. if you are using an A6000GTi and three Dual voice-coil subwoofers, such as and, if they are dual voice-coil sub W15GTi subwoofers, each subwoofer SERIES CONNECTIONS will receive 2,000 watts. JBL’s GTi series, may be connected woofers, their coils must be wired in series, as shown in Figure 2; in identically. Do not connect the coils of The formula for determining the parallel, as shown in Figure 3; or in one subwoofer together in series and total impedance of the two woofers It’s important to choose a system of series-parallel, as shown in Figure 4. another in parallel, since doing so will connected in series is: subwoofers that will handle all of the cause uneven power distribution, Ztotal = Z1 + Z2 + Z3 ... power. To determine how much total potential damage to the speakers, and Figure 4. Series-parallel connections power your speaker system will Where Ztotal is the total impedance of poor overall performance. of three W15GTi subwoofers (with a handle, simply multiply the RMS power all woofers connected in series. Z1, Z2 voice coil impedance of 6 ohms) yields handling rating of one of your speakers and Z3 (and so on) are the nominal a total series impedance of 12 ohms by the total number of speakers that impedance ratings of the individual for each subwoofer, and an equivalent will be connected. speakers. The total impedance of the parallel impedance of 4 ohms for all voice coils shown in Figure 2 is 8 ohms. three subwoofers. 4 ohms 4 ohms Remove Terminal Jumper Figure 2. Series connection of two 4-ohm voice coils yields a total impedance of 8 ohms. Black Red RemoveTerminal Jumper 3 SUPPLYING POWER TO THE GTi AMPLIFIER POWER IN IS POWER OUT In order to get full power out of your amplifier, you must provide full power to your amplifier. That’s a basic rule of physics. The A6000GTi amplifier can draw nearly 800 amperes when reproducing sine waves at full output. Both JBL A6000GTi and A3000GTi amplifiers can quickly exhaust the factory-installed charging system of any vehicle on the road today. With this much available amplifier power, you will need to beef up your vehicle’s electrical system to satisfy the amplifier’s current demands. We recommend adding at least two 12-volt batteries, connected in parallel with cold-cranking capacities of at least 600 amperes each, to the factory-installed charging system. HOW YOUR CHARGING SYSTEM WORKS The battery’s job is to start your vehicle. Running the electrical accessories is the alternator’s job. The battery isn’t designed to be a continuous source of power. It is a renewable source and is charged by the alternator when the engine runs. Battery charging can only occur when the current demand from the electrical accessories is less than the total current output capacity of the alternator. PROGRAM MATERIAL AND CURRENT DEMAND Music is a combination of loud and soft sounds, with varying durations and rhythms that present unique current demands during amplification. For example, it may take full power to reproduce the sound of a kick drum. The peak power demand doesn’t last very long, but it is repeated over and over. If your charging system can’t provide all the power your amplifier needs on a continuous basis, it still may be adequate. During the sound of the kick drum, the battery can provide the extra current that’s necessary, and between kick drum beats, the alternator will put some of the energy back into the battery. However, depending on the current rating of the alternator, the amplifier’s maximum output power, the music content, and the charging system’s capability, the alternator may not be able to keep up over time. In that case, you’ll need to install a somewhat larg...
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