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perfect! you just sent to me the copy in Italian witout even my specification!!!! so you are really smart cooperative and efficient. To my opinion the best place all over to get a manual of electronics!!!!
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Well Well Well!!!! Good manual perfect for my hobby!!! As Before you have done a very well done work!!!! Thank you
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Super nice! Good to have a manual in digital format.
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Great job supplying the manual.
Many of these products weerepretty obscure, so it was great that you had
the manual for it!
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Great manual, would not have been able to operate my machine without it!!
James Dawson August 18, 2012
Connecting Your Subwoofer to Your Ampli�er JBL GT Series subwoofers are available in three different con�gurations: single 4-ohm voice coil, single 8-ohm voice coil and dual 4-ohm voice coils. Depending on the ampli�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 ampli�er. To achieve the maximum ampli�er output possible, you should design a speaker system that provides the lowest impedance that your ampli�er is rated to drive safely. When designing a subwoofer system, abide by the following rules: 1. Don�t 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 ampli�er-damping factor (the ampli�er�s 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 ampli�er-output impedance, connecting woofers in series reduces the damping factor of the ampli�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 ampli�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 ampli�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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$4.99 GT1241D JBL Service Manual Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagr…
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