Connecting Your Subwoofer to AN Amplifier

At extremely high power, each coil will enter the other coil’s magnetic gap. This will cause magnetic braking, which will slow the cone’s motion and prevent damage due to overexcursion. For a GTi Series woofer, Xmax is determined by the amount of voice-coil overhang between the ﬁrst and second top plates. See Figure 3. Thermal power handling is far superior to a conventional DVC woofer using voice coils of a similar diameter and length because Differential Drive provides twice the heat-dissipating surface area and two top plates to transfer heat to the magnet-cover ﬁns.

Figure 3. JBL dual-gap design

CONFIGURING THE VOICE COILS

Figure 4. Terminal locations

Note: Unlike conventional DVC subwoofers, the two sets of terminals are conﬁgured so that both positive (+) terminals are on one side of the frame and both negative (–) terminals are on the other side. GTi Series subwoofers are shipped with terminal jumpers installed which conﬁgure the two 6-ohm voice coils in parallel for a 3-ohm load. Note: Both voice coils MUST be connected to the ampliﬁer in series