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CONNECTIONS
OR
Pre-amps, effects units and anything else with a line output, should be connected to the PDI-09's
input jack using a good quality shielded instrument cable.
Guitar amplifiers (heads as well as
combos) should be connected to the input of the PDI-09 using a speaker cable. The PDI-09's "THRU"
will be used to connect back to the speaker (using a speaker cable). If your amplifier has multiple
speaker outputs then these can also be used to connect to The Junction. Since the PDI-09 does not
load the speaker output, no change will take place in the amplifier's impedance adjustments. If
your amp has a variable impedance switch, it should be set at the impedance of your
speaker/speaker cabinet or external load box.
We find that best results are achieved with strong
input levels. That's why we always prefer a speaker signal as opposed to a line signal.
CAUTION: Keep in mind, that tube amplifiers (power amps) MUST always have a load
(speaker) connected. You MUST have a speaker or equivalent load box connected to the
'thru' jack of the PDI-09 or considerable damage to your amplifier may occur. The PDI-09
DOES NOT POSSESS SUCH A LOAD, AND SHOULD NEVER BE USED AS A SPEAKER
REPLACEMENT!
We offer other devices such as the PDI-03 and PGA-04, which have a "dummy
load", and can substitute for a speaker in case you want to use a tube amp "silently". Transistor
amplifiers and tube pre-amps do not need a load (speaker) connected to their output.
The BAL.OUT (balanced output) jack delivers a microphone signal.
Using a microphone cable
(balanced and shielded with XLR connections) connect to the microphone input of the mixing
console. In conforming to industry standards, The Junction's output is equipped with an XLR/m jack
where pin 2 is hot resp. + phase. As any good DI-Box should, the PD1-09 also implements a galvanic
isolation between the input and output, which is the safest way to avoid humming caused by a
ground loop.
SWITCHES AND THEIR FUNCTIONS
The Junction has three switches with the following functions:
ATTENUATOR: Used to adjust the output/signal level coming out of the PDI-09. As a general guide,
you can use the following settings: 0 dB for pre-amps (line level output or instrument level signals such
as a pedal board), 15 dB when using lower wattage amps (practice amps) that do not exceed 10W
output power, and 30 dB for higher wattage amplifiers.
(TONE SWITCH) BRIGHT NORMAL MELLOW: This switch influences the critical high frequency area of
guitar speakers. Is very simple and offers three options. We purposely avoided using such terms as
"4x12 closed back" because even identical cabinets with different speakers do not sound the same.
That being said, there is no doubt that we all associate different cabinets with certain sound
expectations.
Page 2
Palmer PDI-09 Owners Manual
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