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JBL GTO1220
Owner's Manual


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  • Language: English
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Description of JBL GTO1220 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 Amplifier JBL GTO Series
JBL GTO Series subwoofers are available in two different conï¬gurations: as a single 2-ohm voice coil or as dual 2-ohm voice coils. Depending on the ampliï¬ers you are using, you may use either single-voice coil or dual-voice coil subwoofers in singles or multiples to maximize the power available from your ampliï¬ers. 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, consider the following rules: 1. Donât mix different subwoofer or enclosure types in the same system (use all single-coil woofers or all dual-coil woofers). 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. The ampliï¬erdamping 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. Therefore, connecting separate 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 dual-voice coil woofer connected 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 can be calculated using the formula: Impedance = 1 1 + 1 + 1 ... w w w
1 2 3

Figure 1. Parallel connection
RED STRIPE POS ( + ) BLACK STRIPE NEG ( â )

POS ( + ) NEG ( â )

Figure 2. Series connection
RED STRIPE POS ( + ) BLACK STRIPE NEG ( â )

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.

POS ( + )

NEG ( â )

03

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