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LEHLE GmbH · Germany · www.lehle.com · support@lehle.com
LEHLE P-SPLIT III AS A LINE ISOLATOR – THE UNIVERSAL CURE FOR
HUM LOOPS
The LEHLE P-SPLIT III can be used in any
scenario to eliminate noise resulting from
ground loops or hum. Ground loops oc-
cur when units grounded by a protective
earth conductor (“PE conductor”) are
connected to each other.
The protective earth conductor and the
ground connection of the audio signal
create a loop which will pick up external
interference generated, for example, by
coils. Such interference will impair the
signal. The LEHLE TRANSFORMER HZ
included in the LEHLE P-SPLIT III galvani-
cally isolates the ground connection. The
hum loop is thus broken at this point.
Both high- and low-impedance signals
can be fed, the LEHLE P-SPLIT III has no
problems with balanced or unbalanced
signals.
HOW TO DO THIS
1. Connect the signal source to the input
(1) of the LEHLE P-SPLIT III.
2. Do not use the DIR socket (2).
3. Connect the ISO socket (5) to the sig-
nal input.
4. Use the ground lift switch (4) to deter-
mine which position eliminates the most
background noise.
5. There you go!
DEVICE CONNECTION
D I R
I S O
M A D E I N G E R M A N Y
P- S P L I T
Input
Signal source
Output
Signal input
ISO
In the above scenario, the LEHLE P-SPLIT
III is grounded via the signal source in-
put. In some cases, it may be a good idea
to connect the ground to the other side,
in order to eliminate even more interfer-
ence. To do this, simply swap the input (1)
and the ISO output (5).
!
