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8. Master Volume
The Master control adjusts the overall output level of the amplifier. The level being sent to
the Balanced Line Output is not affected allowing the signal at the mixing console to be
unaffected by adjustments during performance.
Effects Loop
Send
9. Effects Loop (Pre-Amp Out and Power Amp In)
The Effects Loop (Pre-Amp Out and the Power Amp Input) jacks provide versatility not
usually associated with vintage tube amplifiers. The Effects Send jack (Pre-Amp Out) can be
used as an effects send or to slave another YBA300. The Effects Return (Power Amp Input
jack) goes directly to the YBA300's power amplifier, bypassing the pre-amp, which makes a
perfect effects return. The Effects Return (Power Amp Input) also lets the YBA300 be a true
slave from another pre-amp.
Note: The output signal of the Effects Send (Pre-Amp Out) is set at 0 VU. When using the
Effects Send (Pre-Amp Out) as an effects loop it's recommended to use professional-grade
signal processing equipment (pedal effects might not have enough headroom).
10. Line Out XLR Jack, Selector and Ground Lift Switches
The YBA300 is equipped with a balanced D.I./Line output. You can select a direct, clean
signal (Pre-EQ setting which delivers the sound directly to the Balanced Line Out) or tap
the signal after the pre-amp (Post-EQ). Both signals are routed to the Balanced Line Out
before the Master volume. A Ground Lift (lifts Pin 1 of the XLR) is also provided to help when
routing signals directly to other equipment or mixing consoles.
11. Tuner Output
The YBA300 features a ¼-inch Tuner Output jack to enable direct connection with a tuner
without affecting the signal path into your amplifier.
12. Speaker Impedance Switch and Speaker Output Jacks
Extension speaker cabinets are connected using the Speaker ¼-inch output jacks or the
"Speakon" connector. Connections to these jacks are in parallel. Using the Speaker Load
switch, the output of the YBA300 can be optimized to provide the rated full power (300 watts)
for selected loads (4-ohms or 2-ohms).
D.I. EQ
Out
Pre
Post
D.I. / Line Out
Return
Effects / D.I. / Tuner
4
Impedance
Speaker Load
with ALL Speakers
Connected
ATTENTION: Before powering unit on,
make sure speakers are connected
SPEAKER OUTPUT
3
Ground Tuner
Lift
Gnd
2
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