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Introducing the R-4 Pro
Headphone jack [PHONES]
You can connect a set of headphones with this jack. Use the monitor level knob () to adjust the
volume. If you connect headphones, no sound is output from the internal speakers ().
Grounding terminal
927
Depending on the circumstances of a particular setup, you may experience a discomforting sensation, or
perceive that the surface feels gritty to the touch when you touch this device, microphones connected to it,
or the metal portions of other objects, such as guitars. This is due to an infinitesimal electrical charge, which
is absolutely harmless. However, if you are concerned about this, connect the ground terminal (see figure)
with an external ground. When the unit is grounded, a slight hum may occur, depending on the particulars
of your installation. If you are unsure of the connection method, contact the nearest Roland Service Center,
or an authorized Roland distributor, as listed on the “Information” page.
Unsuitable places for connection
• Water pipes (may result in shock or electrocution)
• Gas pipes (may result in fire or explosion)
• Telephone-line ground or lightning rod (may be dangerous in the event of lightning)
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