JBL GT5-12 Owners Manual EN - Page 3

CONNECTING YOUR SUBWOOFER TO YOUR AMPLIFIER The GT5-12 subwoofer has a single 4-ohm voice coil. Be sure to consider your amplifier's optimum load when designing a subwoofer system. Many bridgeable 2-channel amplifiers are optimized to drive a single 4-ohm woofer in bridged mode. If you will use multiple woofers, be sure to configure them to extract all the power available from your amplifier. When designing a subwoofer system, consider the following rules: 1. Do not mix different subwoofers or enclosure types in the same system. Subwoofers being used in the same enclosure or powered by the same amplifier should be identical models. Mismatched woofers and enclosures can result in poor system performance. 2. Most amplifiers deliver exactly the same amount of power bridged into a 4-ohm load as they do driving a 2-ohm stereo load. 3. If you are designing a multiplewoofer system, be sure to configure the woofers so that they each receive the same amount of power from the amplifier. Never connect two identical woofers in series and then connect that pair to another woofer in parallel. If your system will include an odd number of woofers, be sure to connect all the woofers in either series or parallel according to the rules that follow, in order to maximize the power available from your amplifier: a. The total system impedance of voice coils (or woofers) in series can be calculated using the formula: Impedance = w1 + w2 + w3 ... b. The total system impedance of woofers in parallel can be calculated using the formula: Impedance = 1 w1 + 1 1 w2 + 1 ... w3 where w is the nominal impedance of the woofer. The diagrams at right show series and parallel speaker connections. To Amp To Amp PToosAitimvep NTeogAatmivpe Positive Negative Figure 1. Connecting two woofers in series to the amplifier (8 ohms) Red PoRsietidve Positive Black NeBglaactikve Negative Red PoRsietidve Positive Black NeBglaactikve Negative To Amp PToosAitimvep Positive To Amp NTeogAatmivpe Negative Figure 2. Connecting two woofers in parallel to the amplifier (2 ohms) Red Black PoRsietidve NeBglaactikve Positive Negative Red PoRsietidve Positive Black NeBglaactikve Negative Connection of singl Series connection o Series connection o Parallel Connection of tw Parallel Connection of tw To Amp To Amp PToosAitimvep NTeogAatmivpe Positive Negative 3