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GLOSSARY
Galvanic isolation means that there is no electrically conducting connection between the two
points. This is the case with a transformer: the signal is transmitted between input and output by
varying magnetic fields. In digital electronics you can employ opt couplers, in which case the signals
are transmitted by light impulses.
You can differentiate Hum caused by ground loops from other low frequency interferences simply by
connecting the mass of the two devices (e.g. metallic parts of the chassis) to provoke the system to
hum. The reason for ground loops is that ground potentials are not always exactly the same. Due to
different cable lengths and other factors a slight displacement in the ground potential can take
place. So if you connect two devices with different ground potentials to each other, a current will
flow between them over the shielding of the audio cable. As a result a hum at mains frequency (50
or 60HZ) including its harmonics will overlay the signal. The more experienced users will be able to
determine a ground loop by its sound alone. Other humming caused by interferences sounds
brighter and has more harmonics compared to the hum caused by a ground loop, which sounds
sonorous and deeper.
SPECIFICATIONS
Passive DI-Box with an integrated LCR-filter to simulate the frequency response of a typical guitar
speaker in its casing.
Input: Mono jack socket: ¼ " jack with parallel "THRU" jack
Max. Input voltage 40V
(200Watt speaker output, impedance 8 Ohms)
Input impedance: nominal 2kOhms
THRU-jack: Mono jack socket parallel to the input. For looping through the input signal. Does not
function as an input jack.
Output: XLR/m jack balanced, pin 1= ground (or casing mass), pin 2 + phase (hot), pin 3 phase (cold)
Output impedance: Nominal 600 Ohms
Switch :
ATTENUATOR:
Switch: MELLOW-NORMAL-BRIGHT (Selects between a mellow, linear, or bright rendition of the signal)
GND LIFT: Ground-Lift-Switch
Connects or breaks the ground connection between the jacks and XLR pin 1
No battery necessary
Copyrighted & Manufactured by: Palmer, a Division of Adam Hall GmBH
Tel.: +49 (0) 6081 94190 Fax: +49 (0) 6081 43280 Email: palmer@adamhall.com
Page 4
O dB for line signals
-15dB for small amps up to 10W
-30dB for large amps up to 200W
adam hall
Rudolf Diesel-Strasse 5, D61267 Neu-Anspach, Germany
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
Palmer PDI-09 Owners Manual
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