Turn-On Lead, Input Section, Input Voltage Range

Turn-On Lead

The G1300 uses a conventional +12V remote turn-on lead, typically controlled by the source unit’s remote turn-on output. The amplifier will turn on when +12V is present at its “Remote” input and turn off when +12V is switched off. If a source unit does not have a dedicated remote turn-on output, the amplifier’s turn-on lead can be connected to +12V via a switch that derives power from an ignition-switched circuit.

The G1300’s “Remote” turn-on connector is designed to accept 18 AWG – 12 AWG wire. To connect the remote turn-on wire to the amplifier, first back out the set screw on the top of the terminal block, using the supplied 2.5 mm hex wrench. Strip 1/2 inch (12mm) of wire and insert the bare wire into the terminal block, seating it firmly so that no bare wire is exposed. While holding the wire in the terminal, tighten the set screw firmly, taking care not to strip the head of the screw and making sure that the wire is firmly gripped by the set screw.

Input Section

The G1300’s input section allows you to send signal to the amplifier section through the use of two differential-balanced inputs, one for the left channel signal and one for the right channel signal. Connection is via RCA-type jacks.

You may run a stereo or a mono signal into the inputs of the amplifier. The amplifier’s input section automatically sums stereo signals to mono for the internal amplifier section.

The amplifier will operate with only one input connection (left or right), but will require an increase in input sensitivity to overcome the loss

Input Voltage Range:

A wide range of signal input voltages can be accommodated by the G1300’s input section (200mV – 8V). This wide range is split up into two sub-ranges, accessible via a switch located to the left of the Input Connectors.

The “Low” position on the “Input Voltage” switch selects an input sensitivity range between 200mV and 2V. This means that the “Input Sens.” rotary control will operate within that voltage window. If you are using an aftermarket source unit or an OEM interface processor with conventional preamp-level outputs, this is most likely the position that you will use.

The “High” position on the “Input Voltage” switch selects an input sensitivity range between 800mV and 8V. This is useful for certain high- output preamp level signals as well as speaker-level output from source units and small amplifiers.

To use speaker-level sources, splice the speaker output wires of the source unit or small amplifier onto a pair of RCA plugs. No line output converter is needed in most cases.

AMPLIFIER CONTROLS

1)“Input Sens.”: Once the appropriate “Input Voltage” range has been selected, the control labeled “Input Sens.” located in the “Amplifier Controls” section can be used to match the source unit’s output voltage to the input stage of the amplifier for maximum clean output. Rotating the control clockwise will result in higher sensitivity (louder for a given input voltage). Rotating the control counter- clockwise will result in lower sensitivity (quieter for a given input voltage.)

of signal. If a mono input signal is to be run, we recommend that you use a “Y-adaptor” to split the

mono signal into both inputs of the amplifier.

Left Channel Only or Right Channel Only Information: If you wish to send a Left-only or Right-only signal to the G1300, use a “Y-Adaptor”to split the single channel signal into both left and right RCA inputs. This option is useful when using one G1300 to drive the left channel speakers only and another G1300 to drive right channel speakers only.

If you plan to use the “Pre-Outs” to feed a stereo amplifier, you must connect a stereo signal to the input of the amplifier. A mono signal into the amplifier will result in a mono signal out of the preamp output. (It’s a great amplifier, but it doesn't do magic).

The output of the amplifier will decrease for a given input voltage when the “Input Range” switch is placed in the “High” position.

Conversely, the output will be higher with the switch in the “Low” position. While this may sound counter-intuitive, it is consistent with the descriptions above.

To properly set the amplifier for maximum clean output, please refer to Appendix A (page 12). After using this procedure, you can then adjust the “Input Sens.” level downward if this is required to achieve the desired system balance.

Do not increase any “Input Sens.” setting for any channel(s) of any amplifier in the system beyond the maximum level established during the procedure outlined in Appendix A (page 12). Doing so will result in audible distortion and possible speaker damage.

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