tracking goals of the engineer, either PRE or POST might be used. When using the amp as a preamp (into a pro audio power amp
or powered PA cabinet for example), generally the POST position would be used and line level would be selected (unless using a
powered speaker that can accept mic level signal).
DI OUT PIN 1 LIFT:
This switch connects or lifts the circuit ground/earth/common connection from pin 1 on the XLR DI OUT
connector. Balanced outputs do not rely on the pin 1 or shield connection to transmit signal to the console. While pin 1 is always con-
nected to the console’s master ground bus, sometimes (due to differences in potential of a building’s ground/earth system) currents
will flow between grounds if there is a common connection, resulting in hum. By lifting the ground at the source (bass amp) end, this
allows the shielding to the console’s input to remain in place while breaking the ground current flow that is responsible for inducing
hum into the audio signal carrying pair of conductors. One thing that complicates this is that at very high (radio) frequencies, ground
is not “really” ground, so additional techniques are incorporated within this network that allows 2 simultaneously functional grounding
spectrums within the same network, providing added RFI (radio frequency interference) rejection. The general rule is to start with
pin 1 lifted, and if there is noise, try connecting it and see if the noise level drops. It should also be noted that there are a lot of other
possible causes for noise, this switch is only a solution for ground loop noise between the PA and the bass amp.
USB DEVICE POWER:
This connector provides power to USB devices that might be used in conjunction with practicing, re-
cording, jamming or even performing. It may also be used to recharge phones, MP-3 players, iPods, and any number of devices. This
port follows the PC USB 2.0 standard, rated current is 500mA maximum, and conforms to the Apple USB charge current standard.
While this charge port will work with most devices, there are some that do not conform to any current demand/limit standards or must
be operated from a high current (or proprietary) USB charge port only. These devices will either charge more slowly or possibly not
at all. Due to the lack of uniformity in the market following standards, and continual evolution/changing of the standards, this port is
offered as a convenience only.
PLAYER NOTES AND REMINDERS:
PAGE 9
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