Depending on the amplifiers you are using, you may use GTO subwoofers in singles or multiples to maximize the power available from your amplifiers. To achieve the maximum amplifier output possible, you should design a speaker system that provides the lowest impedance that your amplifier will drive safely. 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 from the same amplifier should be identical models. Mismatched woofers and enclosures can result in poor performance from your subwoofer system. You may connect the coils of a dual-voice coil woofer in series, but we recommend that you avoid connecting separate woofers in series. You must use both coils of a dualvoice coil woofer connected either in series or in parallel. Most amplifiers deliver exactly the same amount of power bridged into a 4-ohm load as they do running a 2-ohm stereo load. To design a subwoofer system that maximizes available amplifier power, keep the following rules in mind: 1. The total system impedance of woofers in parallel can be calculated using the formula: 1 Impedance = 1 1 1 + w + w. w1 2 3 where w is the nominal impedance of the woofer. The total system impedance of voice coils (or woofers) in series can be calculated using the formula: Impedance = w1 + w2 + w3. The diagrams at right show parallel and series speaker connections. NOTE: There are two jumpers supplied with the woofers to make connections easier. NOTE: The GTO1002D, GTO1202D and GTO1502D come with one jumper installed for a series configuration. NOTE: The GTO1204BP-D, GTO1204D and GTO1504D come with both jumpers installed for a parallel configuration. Figure 2. Series connection Figure 1...