Yamaha 01x, Service Manual

Page: 104 / 153

104
O1X
When using audio devices, musical instruments and computers
at the same time, there is bound to be some noise in the system,
the amount of which depends on the connections. Knowing how
to minimize noise is extremely important when designing and
setting up a studio.
As advanced as the 01X is, it too is susceptible to noise. Various
types of noise may be generated and recorded to your audio
sequencer, depending on the power sources/ grounding scheme
and how the various devices are connected.
There is no ideal way to completely eliminate such noise.
However, one can decrease noise by isolating the cause and
applying a suitable remedy. Below are a couple of examples
that may apply.
• High- pitched buzzing or whirring operation noise
in the computer
This is caused by operation noise of the computer leaking to
other devices through the mLAN cable or audio cable, and may
be caused by improper grounding of the power source.
• Low humming noise
Noise of this type is generally due to improper grounding of the
power source.
NOTE
• The noise may differ depending on the circumstances
(specifications of each device and locations of use).
If problems like these happen, try the following measures to
minimize the noise.
NOTE
• If the noise disappears when turning down the volume of the
01X and/or if the noise persists even when disconnecting the
mLAN cable or turning off the computer, other reasons for the
noise are likely. Refer to the Troubleshooting section in the
Owner’s Manual.
■
ABOUT CONNECTIONS WITH EXTERNAL DEVICES WHEN USING THE
01X WITH A COMPUTER
1
Use balanced cable connections when connecting analog
audio. By using proper balanced connections, you can
minimize the noise.
NOTE
• This may have no effect depending on the specifications of the
connected device.
Example: MONITOR OUT of 01X – [direct box] – powered speaker
Synthesizer – [direct box] – 01X
3
Changing the power source for each device.
• 01X Inputs
• 01X Outputs
Outputs of connected devices 01X inputs (balanced)
01X
inputs
Balanced
(mixer, mic
preamp, etc.) TRS 1/4" phone / XLR XLR balanced cable Ch. 1-2
TRS 1/4" phone / XLR TRS phone balanced cable Ch. 3-8
Unbalanced
(MIDI tone gen-
erator, etc.) Unbalanced 1/4" phone XLR balanced cable Ch. 1-2
Unbalanced 1/4" phone TRS phone balanced cable Ch. 3-8
01X outputs
(MONITOR OUT, STEREO/AUX OUT)
Inputs of connected
devices (balanced)
—
Unbalanced Unbalanced 1/4" phone
TRS phone/XLR balanced
cable
—
●
Recommended Cables
2
Insert a conventional direct box (passive, with transformer
and ground lift switch) for connecting the audio (analog)
cable.
NOTE
• You may want to use several direct boxes when connecting
multiple devices.