ÿþP GA - 0 5 manual . wps - JAMS Audio

ÿþP GA - 0 5 manual . wps - JAMS Audio
Warning! The PGA-05 does not contain a Load Box.
When used with a tube amplifier,
there MUST be a load connected to the amplifier output.
See section - Guitar Amplifier and PGA-05.
PGA-05 Manual
ADIG-ST Advanced Direct Injection for Guitar-Stereo
BACKGROUND
The PGA-05 is one of a special series devoted to the direct injection of guitar
amplification. A DI box should normally transfer a linear signal through its circuitry.
The guitar amplifier’s loudspeaker, however plays a very important role in forming the
electrified sound, and therefore must be taken into account when replacing the
miked-up sound. While the PGA-04 (ADIG-LB) has a built-in Load Box (loudspeaker
substitute) for connecting directly to the amplifier, the PGA-05 does not. Instead, it is
a two channel (stereo) DI box that can accept the full power speaker output of an
amplifier or a line level pre-amplifier/multi-effect output signal using the Line/Spkr
Input level switch.
Some preamps and multi-effect units have a built-in “Recording Output” which is
designed to reproduce a miked cabinet. While this may be convenient, it frequently
does not sound very good. This will not be the case using the analogue technology of
the Palmer PGA-05. The subtle phase changes and conflicts that a normal
loudspeaker generates is reproduced via the PGA-05’s filter circuit--thus producing a
more lively and diversified sound.
Warning! The PGA-05 does not contain a Load Box. When used with a tube amplifier,
there must be a load connected to the amplifier output. See section - Guitar Amplifier
and PGA-05.
CONCEPT
As stated, the PGA-05 has two completely separate channels which can be
individually adjusted for sound and tone. This is ideal for a stereo DI guitar set-up. In
each channel, the input signal is powered up using a very small built-in amplifier. The
mini-amplifier has an operating voltage of about 60V and therefore guarantees an
excellent dynamic sound. This signal is then led through the LC-filters which form the
speaker “sound”. It is then routed through a transformer-isolated line-out stage to give
a ground-free balanced XLR output, or unbalanced jack output. Parallel to this, a
second unfiltered signal, that we’ll call a “Full Range” signal, is also fed to the final
stage. Without using up a second channel on the mixing desk, these two signals can
be mixed internally using the separate “Filter” and “Full Range” volume controls. Very
often this technique is used in the recording studios when a direct (clean) signal is
mixed with the speaker output to create a “cutting” bright sound. The extreme highs
can be filtered out to give a smoother sound by using the 6kHz Hi-Cut-Filter. This
method can be used to reproduce the sound of a 12” loudspeaker or a brighter 10”
speaker.
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Palmer PGA-05 Users Manual
CONNECTIONS & SET-UP
The PGA-05 is not only useful in the studio, but also for live performances--so here are a few common
set-ups. Please check the voltage requirement in your area and adjust the voltage switch accordingly.
The two position switch can be found on the base plate under the Palmer sign. If your local power
supply is 100 – 120 Volts, the switch should read 115. In Europe and many other countries, the power
supply is between 220 and 240 Volts, and should be set to 230.
All inputs and outputs are on the back panel. All adjustment controls for sound shaping are on the
front. Once the voltage switch is correctly set, use the supplied power cable to connect the mains
supply, but do not switch the unit on just yet.
Preamp/Multi-effect Units and PGA-05
Using a shielded instrument cable, connect the stereo output of your preamp or multi-effect unit to the
INPUT–CHANNEL 1 and INPUT–CHANNEL 2 sockets. The LINE/SPKS switch should be set to LINE. To
connect to the Microphone inputs of a PA or studio console, use balanced microphone cables (XLR)
from the XLR outputs BALANCED–CHANNEL 1 and BALANCED– CHANNEL 2. To avoid overdriving the
mixing desk inputs and reduce any signal noise, press the PAD 20dB switch. This cushions the input
signal by a factor of 10. If the mixing console already has a PAD-switch, use it instead of the switch on
the PGA-05.
Balanced microphone cables (XLR) should be used for all connections in order to cover long cable
distances without loss of signal quality. The BALANCED OUTPUT delivers a high enough line level signal
to directly drive a power amplifier. Connecting several pieces of equipment together with differing
chassis potentials can cause ground loops resulting in a disturbing humming noise. The galvanic
isolation between the inputs and outputs of the PGA-05’s transformer guard against ground loop hum.
The LIFT/GND switch provides further protection. The UNBALANCED OUTPUTS may be used as a line-out
to connect to a monitor amplifier, or to the sound card of a computer for HD recording.
Guitar Amplifier and PGA-05
Your guitar amplifier may have a line-out jack which you can connect like a preamp output (see
above).
Ordinarily the amplified sound is shaped not only using the tone controls but also by overdriving the
amplifier‘s power tubes. In this case the PGA-05 should be hooked up between the amplifier and the
speaker. Connect a speaker cable (NOT an instrument cable) from the speaker output of the amplifier
to the INPUT of the PGA-05. The switch beside the input socket should now be set to SPKS. A tube
amplifier must only be operated with an output load resistance. This means a loudspeaker box must
be hooked up to the THRU jack. If you don’t want a loudspeaker then use a Loadbox (dummy load).
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Palmer PGA-05 Users Manual
CAUTION: NEVER operate a tube amplifier without some sort of Loadbox, as this will
lead to massive and permanent damage to the amplifier. We cannot be held
responsible for any damage caused by faulty wiring or ignoring this warning!
Check all wiring and connections before SWITCHING ON!
If the amplifier has a separate, parallel speaker output, this can be directly hooked up to the INPUT of
the PGA-05 using a speaker cable. The amplifier speaker should be left connected as usual, with the
output impedance switch set to the appropriate value for the loudspeaker (2/4/8/16 Ohm). The input
impedance of the PGA-05 is so high that it not affect the normal amplified sound in any way.
Tip! If you are not using both channels of the PGA-05, link the THRU-CHANNEL 1 socket to the INPUTCHANNEL 2, then you can use the controls of both channels to optimize the separate “clean” and
“distorted” sounds. Feeding the two outputs through a switching/looper system allows you to alternate
between the two different sounds.
Switches and Controls
After everything is connected, switch each piece of equipment on, leaving the PGA-05 until last. All
faders on the mixing desk should be turned down. This applies to all equipment connected to the
outputs of the PGA-05, as extreme switching noise eventually causes loudspeaker damage.
Configure your Preamp/Multi-effect unit or amplifier to your normal sound settings.
If your preamplifier has an output switching choice of –10db or 0/+6dB, then use the 0/+6dB position,
otherwise set the preamp output control (Master Volume) approximately in the middle position.
The usual start settings on the PGA-05 are as follows:
FULL RANGE: Completely off (counter clockwise position),
VOICING: LOW and HIGH in the middle position,
COLOUR: Switch depressed to LITE. Now turn the FILTER VOLUME control up until the mixing
console input (using PFL/SOLO switch) has an adequate level. Turning the HIGH control gives you
a sound between MELLOW (soft), to BRIGHT (aggressive) .
We purposely avoid naming all the different makes of amplifier/speaker combinations. But there is no
doubt that we all associate different cabinets with certain sound expectations.
The LOW control decides the type of Speaker box that can be emulated.
FLAT describes more the “thin” sound of a “2 X 10” cabinet
DEEP represents a double “4 X 12” stack
Between these settings lie a multitude of other possibilities--find your preferred speaker/sound
combination!
The COLOUR switch decides the character of the speaker.
BROWN is a darker almost nasal sound
LITE is a more open, full range sound
The COLOUR switch is strongly influenced by the position of the of the HIGH control.
If you prefer aggressive distorted sounds, mix in the FULL RANGE VOLUME control, but it is essential to
press the HI-CUT switch to avoid the notorious “Paper Cutting” sound. For extra-clean sounds however,
we do recommend using the FULL RANGE without the HI-CUT function.
We have deliberately only given basic suggestions, and no sure recipes. We are confident that you
will soon find your own individual sound.
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Palmer PGA-05 Users Manual
PGA-05 ADIG-ST Specifications
Special two channel DI-box, with loudspeaker-simulation filters.
Casing: 19” 1U Rack, 170mm deep
Each Channel
Input: Unbalanced jack
Parallel Output (Thru): Unbalanced jack
Input Level: Switchable between Line and Speaker level, ground-free
Output: 1 x XLR/m transformer balanced, with 20dB Mic/Line PAD switch
2 x unbalanced jacks, floating ground
Controls: Volume Filter, Low, High, Full Range Volume
Switches: Brown/Lite, 6kHz Hi-Cut
Ground Lift Switch:
Ground, Lift
Power Supply: 115/230V Switchable, Fuse 63mAT/230v, 125mAT/115V
On/Off Switch, LED, Combined Power Socket/Fuse Holder
adam hall
Copyrighted & Manufactured by: Palmer, a Division of Adam Hall GmBH
Rudolf Diesel-Strasse 5, D61267 Neu-Anspach, Germany
Tel.: +49 (0) 6081 94190 Fax: +49 (0) 6081 43280 Email: palmer@adamhall.com
USA and CANADA Distributor: JAMS Audio, NASHVILLE, TN.
www.PALMERGEAR.com
PHONE: TOLL FREE 1-866-380-5267, FAX: 1-866 -389-5267
E-MAIL: jamsaudio@palmergear.com
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Palmer PGA-05 Users Manual
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