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Measuring Phase of Effects Unit Connected to ARC-4

Optional Cable RC-7

Turn on the power to the PHA-1, ARC-4, and your effects unit(s).

Turn the TEST SIGNAL LEVEL knob fully counterclockwise so that

the test signal will not be output.

1. Press the SOURCE SELECT switch until "OPTION-2" is shown in

the top line of the Display.

2. Press the TEST switch to select the measurement mode to be

used. Measurement modes switch each time when the TEST

switch is held pressed for about 1 second.

Two Types of Phase Measurements and Phase Judgement Principle ➔ p.5

3. Recall the desired ARC-4's preset.

By putting the ARC-4 in Direct mode and turning on the

loops one by one, it is possible to check the phase of each

effects unit.

4. Slowly turn the TEST SIGNAL LEVEL knob clockwise. The

waveform and level of the signal fed into the PHA-1.

Adjust the TEST SIGNAL LEVEL knob so that 4 to 9 LEDs of the

level meter illuminate.

Adjusting Signal to be Measured ➔ p.6

5. To set the device in the reversed phase from the phase

judgement result, turn on the ARC-4's Phase Invert function

and save the setting in a preset.

NOTE

If the recalled combination of effects units contains a delay or reverb

unit, set the effect sound to minimum and perform the measurement.

Notes on Level Meter Display

Placing the level shown at the upper right corner of the Display

as the reference (0 dB), each LED element of the level meter

illuminates when the signal level reaches the corresponding level.

For example, if "-10dBm" is shown at the upper right corner

of the Discplay, the 7th LED (reference)

10 (Top)

+3dB

+2dB

illuminates when the signal level exceeds

+1dB

0dB

-10 dBm. Similarly for "-22dBm," the

-1dB

-3dB

7th LED illuminates when the signal level

-5dB

-7dB

exceeds -22 dBm.

-10dB

1 (Bottom) -20dB

Precautions for Battery Use

The PHA-1 can be driven by a 9-volt battery. When the Display

shows "Low-Battery," replace the battery with a new one. If

the PHA-1 is not used for a long period of time, remove the

battery and store them separately.