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Thunderfunk Bass Amp Owner’s Manual
April 2007 - revision 8
Thunderfunk Bass Amp Owner’s Manual
REAR PANEL FEATURES
The back panel (TFB550-B shown) gives all the connectivity one could ask for. Use it as a fully integrated
amplifier, as a DI, as a preamp, as a Power Amplifier. Use the features stand-alone, or combined.
(Note: The voltage selector switches are under the cover plate, above the AC power connector)
RECORDING OUTPUTS
Direct Instrument Balanced Output
– This DI Output is a balanced XLR connector, a buffered but
otherwise exact replica of the instrument input except at line level. This can be routed to another amplifier
or a mixing console for pure instrument tone unadulterated by any front panel settings. This can also be
routed to a tuner.
Post EQ and Limiter Balanced Output
– This is a balanced XLR output jack, with a variable
output adjusted by the Record Level control. The branch for this is AFTER the Gain/Limiter, Effects Loop
1, all the EQ controls, the Enhancer, and the Timbre controls, but before the front panel Volume (next to
the power switch), the Effects Loop 2, and the Power Amp. Signals from this XLR are therefore fully
controlled and tone shaped by the preamp; it can be routed to a mixing console, direct to the PA or direct
to another Power Amp/Speaker System. Pin 2 is the + signal.
You can also use this DI Output and a special XLR to Phone jack cable to daisy chain several
Thunderfunk slave amps together, matching the setup with one set of preamp controls working all the
power amp and speaker systems simultaneously. See your dealer for more information on possible
setups.
Record Level
– This controls the line level strength being sent from the XLR balanced output jack.
Effects Loop 1
– This is a standard loop with low-impedance line level out and high-impedance line
level back in. The branch is after the Gain/Limiter, and Enhance controls, but before the EQ section and
the Timbre, Volume controls.
Effects Loop 2
– This is also a standard loop with low-impedance line level out and high-impedance
line level back in. The branch is made after all the preamp features, including Gain/Limiting, Enhance,
EQ, and the Volume and Timbre controls.
Plugging a ¼ inch jack into the Effects Send of this loop provides a 1-volt maximum line level signal out.
This can be routed to your choice of effects unit, a mixing console, another power amp/speaker system,
etc. The preamp is still routed to the internal Power Amp. (NOTE: Some external power amps require
more than 1-volt to be driven to full power.)
When plugging a line level return signal via the ¼ inch jack into the Effects Return of this loop, all the
preamp features are disconnected. Only the line signal from the inserted ¼ inch jack is sent to the Power
Amp. You can use the return signal for the device at the Effects Send of this loop, or bring a mono signal