Audioplex QUADTROL Panduan Instalasi - Halaman 3

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Note that the Left and Right attenuator circuits are completely isolated from each other to prevent

instability when used with certain types of amplifiers which have floating grounds. If the amplifier to be

used has common grounds between channels, a 3 wire system can be used between the amplifier and

control, but it will be necessary to connect a jumper between the control ground returns (L- & R-). If one

ground is open, there will be no output on the ungrounded channel at any attenuator setting.

1. Make connections by stripping wire insulation back about 3/16". Twist any loose strands

tightly.

2. Insert the wires from the amplifier into the INPUT openings of the connector, L+ to L+, L- to L-,

etc. and tighten screws. Check for stray wire strands that might cause a short circuit. Make sure

the metal part of the screw connector engages the bare wire, NOT the insulation!

3. Similarly, connect speaker wires to the control OUTPUT openings and tighten screws.

4. Install the control in its operating location. SUGGESTION: Leave control 3 or 4 positions CCW

from maximum before firing up the system for the first time to avoid "blasting" the speakers, while

still having enough sound to observe operation.

5. SETTING THE IMPEDANCE MATCHING INDEX: Your OPTIMATCH (TM) Quadtrol (TM)

is furnished with the index system pre-set for full range operation. (no impedance multiplying

factor).

If an impedance matching setting is required, determine the impedance multiplying factor required for

the installation following the information below. EXAMPLE: The system calls for 8 pairs of 4 Ohm

speakers. This requires a control setting of X8, which is -9 dB, or 3 positions CCW from the maximum

volume (full clockwise (CW) setting). To accomplish this, the index must be set to limit the maximum

clockwise rotation of the control knob 3 positions back from full position.

Remove the knob by pulling it straight away from the panel, and loosen the nut slightly. Rotate the

index finger so that the finger is at about 120 degrees counterclockwise from its original position. Turn

the control shaft fully CCW to the OFF position. Install the knob so that it is fully on the shaft. (HINT:

The knob must be removed and re-installed, a little wax or soap on the shaft will make the job easier.)

Rotate the knob clockwise slowly, counting the switch index positions as you go. Note that the fully

CCW OFF position must count as position #1!

There are 12 positions on the switch. Count up the number that is 12 minus the number of steps down

you wish to set the control. Example: You wish to set the control to X8, which is -9 dB or 3 positions

down from the maximum setting (the pre-set X4 is -6 dB, 2 positions down). In this case you would

count 9 positions (12-3) and stop. (You will probably notice some increased resistance when the stop

inside the knob picks up the index finger.) Holding the control-plate assembly steady, remove the knob

and tighten the index nut. Replace the knob. Check the rotation to make sure you have obtained the

proper number of steps. MAKE SURE THAT THE SWITCH IS IN AN INDEXED POSITION AT THE

MAXIMUM SETTING! an in-between position can cause an excessive load on the system amplifier. If

necessary, repeat the above procedure to achieve satisfactory operation.

OPTIMATCH (TM) INDEX SETTING INFORMATION:

X2- 1 Position CCW from max.- use 2-4 Ohm or 4-8 Ohm speakers simultaneously.

X4- 2 Positions CCW from max.-use 4-4 Ohm or 8-8 Ohm speakers.

X8- 3 Positions CCW from max.-use 8-4 Ohm or 16-8 Ohm speakers.

X16-4 positions CCW from max.-use 16-4 Ohm or 32-8 Ohm speakers.