JBL GTO1014, GTO1514D manual Connecting Your Subwoofer to Your Amplifier, Parallel connection

CONNECTING YOUR SUBWOOFER TO YOUR AMPLIFIER

English

JBL Grand Touring Series GTO subwoofers are available in two different configurations: a single 4-ohm voice coil or dual 4-ohm voice coils. You may use GTO subwoofers in singles or multiples to maximize the power available from your amplifier(s). 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 by the same amplifier should be identical models. Mismatched woofers and enclosures can result in poor performance from your subwoofer system.

2.You may connect the coils of a dual-voice-coil woofer in series, but we recommend that you avoid connecting separate woofers in series.

3.You must use both coils of a dual- voice-coil woofer connected either in series or in parallel.

4.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:

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Impedance = 1 + 1 + 1 ...

w1 w2 w3

where w is the nominal impedance of the woofer.

2.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.

Figure 1. Parallel connection

Figure 2. Series connection

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