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JBL GT1281
Owner's Manual

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  • PDF Format
  • Complete manual
  • Language: English
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Description of JBL GT1281 Owner's Manual

Complete owner's manual in digital format. The manual will be available for download as PDF file after You purchase it.

Owner's Manual ( sometimes referred to as User's Guide or User's Manual ) contains information on how to use Your device. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 3 (click to view)
Connecting Your Subwoofer to Your Ampliï¬er JBL GT Series subwoofers are available in three different conï¬gurations: single 4-ohm voice coil, single 8-ohm voice coil and dual 4-ohm voice coils. Depending on the ampliï¬er you are using, you may use either single- or dual-voice-coil subwoofers in singles or multiples to maximize the power available from your ampliï¬er. To achieve the maximum ampliï¬er output possible, you should design a speaker system that provides the lowest impedance that your ampliï¬er is rated to drive safely. When designing a subwoofer system, abide by the following rules: 1. Donât mix different subwoofer or enclosure types in the same system (use all single-coil 4-ohm woofers, all singlecoil 8-ohm woofers, or all dual-coil woofers).

2. You may connect the coils of a dualvoice-coil woofer in series, but NEVER connect separate woofers in series. Because the ampliï¬er-damping factor (the ampliï¬erâs ability to control the motion of the woofer) is expressed as a ratio of terminal impedance (the sum of speaker impedance, wire resistance and the D.C. resistance of any crossover coil connected to the woofer) to ampliï¬er-output impedance, connecting woofers in series reduces the damping factor of the ampliï¬er to a value less than 1. This will result in poor transient response. 3. You must use both coils of a dualvoice-coil woofer either in series or in parallel. 4. Most ampliï¬ers 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 ampliï¬er power, keep the following rules in mind: 1. The total system impedance of woofers in parallel = 1/(1/w1 + 1/w2 + 1/w3...) where w is the nominal impedance of the woofer. 2. The total system impedance of voice coils (or woofers) in series = w1 + w2 + w3... The diagrams below and at right show parallel and series speaker connections. Figure 1. Parallel connection

Figure 2. Series connection


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