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Input Connections
Equivalently, if you are using the speaker-level connection, you can connect the Powered Subwoofer in parallel with the speakers. The Powered Subwoofer will sample the signal, but will not load the source unit the way a second pair of conventional speakers would, so you do not need to worry that this connection will lower the speaker impedance too far for your ampli�er or source unit. If you are using two GT Powered Subwoofers, only one input channel needs to be used on each subwoofer. Please refer to Figure 2 on page 5 for a wiring diagram.
Adjustments
Volume Level and Crossover Frequency (labeled �X-Over�) adjustments are done by ear. The Crossover Frequency may be adjusted over the range of 80Hz to 150Hz. Midpoint on the X-Over scale is at 125Hz. The knob at �9:00� equals 100Hz, and at �3:00� equals 175Hz. 1. We recommend starting your setup procedure with the volume control set at the minimum, and the X-Over set at the most counterclockwise (80Hz) position. 2. Increase the volume level of the source unit to the maximum listening position. This is the point where the main speakers in the system begin to sound slightly distorted.
3. Back off on the source unit�s volume control until just below the point where you hear distortion. Slowly increase the Powered Subwoofer volume control until you begin to hear slight distortion from the subwoofer. Mark or remember the position of the Powered Subwoofer volume knob and do not exceed this point in subsequent adjustments. 4. Adjust the volume control so that the bass level is balanced to your taste from the listening position.
06
Your GT Subwoofer may be driven either with the preamp output or speaker level output of your source unit. The input impedance of the GT ampli�er module is such that a �y-connector� may be used to connect your source unit simultaneously to the GT Subwoofer and an external power ampli�er used to drive the main speakers when the preamp level connection is used.
 $4.99 GT650P JBL
Service Manual Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagr…
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