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LEHLE GmbH · Germany · www.lehle.com · support@lehle.com

The LEHLE P-SPLIT III combines passive 
splitting with the highest possible signal 
fidelity. 

Its applications range from splitting sig-
nals and eliminating hum, to balancing 
and re-amping along with any signal 
routing that requires a clean signal free 
from noise.

At its core is the high-end LEHLE TRANS-
FORMER HZ, which galvanically isolates 
the two outputs, eliminating any possibil-
ity of ground loops. The LEHLE TRANS-
FORMER HZ was specially designed for 
use with high-impedance signals but also 
splits low-impedance signals with un-
compromising sound quality. The signal 
can be picked off either symmetrically or 
asymmetrically from the ISO output. 

By using the phase inverter switch with 
gold-plated contacts you can flip the sig-
nal phase at the ISO output, preventing 
phase cancellation from impairing signal 
reproduction. 

The classic application for the LEHLE P-
SPLIT III is splitting an input signal to two 
outputs, enabling you to connect an in-

strument to two devices, which may, for 
example, be two amplifiers, or an amp 
and a mixer/recording unit (PC/DAW). 
Thanks to its ability to pick off the bal-
anced signal on the ISO output, the LEH-
LE P-SPLIT III is also eminently suitable for 
use as a high-quality compact DI box for 
all types of signal. 

Another useful application for the LEHLE 
P-SPLIT III is as a hum suppressor. Fre-
quently background noise, caused by 
ground loops occurs when two electronic 
devices are connected to each other. The 
LEHLE P-SPLIT III provides a simple, but 
extremely effective remedy when installed 
between the two units. Using the ISO out-
put, the devices are galvanically isolated 
and background noise becomes a thing 
of the past. 

You can even use the versatile LEHLE P-
SPLIT III as a passive mono summing unit 
for a stereo signal by using the DIR output 
as second input. 

And just in case you are looking for a 
power connection: the LEHLE P-SPLIT 
III performs all its functions without any 
need for a power supply.

INTRODUCTION

Summary of Contents for 1027

Page 1: ...OPERATING INSTRUCTIONS P SPLIT III ...

Page 2: ...IT III comprises only the very best components Every assembly of your LEHLE P SPLIT III has been made and tested in Germany Your LEHLE P SPLIT III is of extremely ro bust design and construction to make sure that you get absolutely years and years of enjoyment from it If you should nonetheless have a problem or simply a question just mail me or a member of the Lehle team at support lehle com I wis...

Page 3: ...ssive splitting General description Typical uses of the LEHLE P SPLIT III as splitter for two amps compact passive DI box line isolator the universal cure for hum loops recording splitter reamplification box balanced unbalanced signal converter passive summing box for stereo signals LEHLE P SPLIT III signal flow diagram 4 6 6 7 8 10 13 14 15 16 18 19 21 22 ...

Page 4: ... for the LEHLE P SPLIT III is splitting an input signal to two outputs enabling you to connect an in strument to two devices which may for example be two amplifiers or an amp and a mixer recording unit PC DAW Thanks to its ability to pick off the bal anced signal on the ISO output the LEH LE P SPLIT III is also eminently suitable for use as a high quality compact DI box for all types of signal Ano...

Page 5: ...DATA Weight 375 g 3 55 3 6 1 45 20 dBu THD 1 50 Hz 20 kHz 0 003 0 dBu 1 kHz min 2 MΩ at 2 kHz 20 Hz 100 kHz 0 1 0 4 dB source 600 Ω load 1 MΩ Length Width Overall height Max Level Total harmonic distortion Frequency range Input impedance transformer load impedance ...

Page 6: ...ignal lines have two conducting cores The signal itself is present on the signal conductor and is connected to the tip of the jack plug The second core which is connected to the sleeve of the jack plug screens the signal conductor and constitutes the sig nal ground UNBALANCED SIGNAL ROUTING Tip Signal in phase Sleeve Ground JACK JACK Cable Sleeve Sleeve Ground Tip Tip Signal in phase ...

Page 7: ...o signal conductors In a bal anced signal line the signal is present in phase at the tip as in the case of an un balanced signal line XLR Pin 2 The second signal conductor carries the same signal but with the opposite polar ity or mirror image phase Ring XLR Pin 3 The third conductor is the screening and again constitutes the signal ground Sleeve XLR Pin 1 BALANCED SIGNAL ROUTING JACK XLR Cable Sl...

Page 8: ...or a signal input and thus defines its low high impedance perfor mance High impedance signals are generally transmitted unbalanced and are relative ly susceptible to interference Long cable routings audibly attenuate high frequen cies Electromagnetic interference from the environment then becomes more no ticeable than in the case of low imped ance and balanced signals There are nonetheless very ma...

Page 9: ...igh impedance inputs behind this if you wish there won t be any problems WHAT IS NOT POSSIBLE Audible sound losses will occur if you use long cable routings from the passive gui tar to the splitter and from the splitter to the amps The sum of all cable lengths to the splitter and to the amps should gener ally not be more than 10m Your individual taste will ultimately de cide however Splitting your...

Page 10: ... input signal remains connected to the ISO and DIR outputs at all times with no semiconductors or any other active com ponents in the signal path Both balanced and unbalanced signals can be split since the LEHLE TRANS FORMER HZ is capable of handling both types 2 OUTPUT SOCKET Connect the input of an amplifier or ef fects unit to be connected directly to the LEHLE P SPLIT III input here The input ...

Page 11: ...s Connecting the ground conductors of the DIR and ISO outputs can help in some situations depending on the units con nected and on their power supplies Use the ground lift switch to find out for yourself the position in which noise is minimised 5 ISO OUTPUT Connect your amp or the audio input of a DAW or a mixer here The ISO output has an input signal which is isolated by means of the LEHLE TRANS ...

Page 12: ...ead of Velcro for stability which you can also find in handy sizes at www lehle components com If you are using the Velcro Dual Lock method please make a note of the serial number on the bottom of the pedal be fore you cover it in case you have a sup port question for us later and don t fancy dismantling your board ...

Page 13: ... am plifiers working in parallel extremely pow erful and simply big HOW TO DO THIS 1 Connect your instrument to the input socket of the LEHLE P SPLIT III 2 Connect the first amplifier to the DIR socket 2 3 Connect the ISO socket 5 to the input of the second amp 4 Use the phase inverter switch 3 to de termine which setting you prefer 5 Use the ground lift switch 4 to find the position at which nois...

Page 14: ...r mixer or stage box 4 Use the phase switch 3 to find out which setting sounds better to you 5 Use the ground lift switch 4 to deter mine which position eliminates the most background noise 6 There you go DEVICE CONNECTION DIR ISO MADE IN GERMANY P SPLIT Input Output Instrument active Amplifier Output Input mixer stage box ISO DIR The signal from a passive pickup can not be split to an amp and mix...

Page 15: ...olates 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 wh...

Page 16: ...ur accustomed sound from an amp while recording the dry signal In this configuration the LEHLE P SPLIT III again functions as a neutral splitter HOW TO DO THIS 1 Connect your instrument to the input 1 of the LEHLE P SPLIT III 2 Connect your amp to the DIR output socket 2 3 Connect the ISO socket 5 to the Hi Z input of a sound card or DAW 4 Use the ground lift switch 4 to deter mine which position ...

Page 17: ... DRIVER II is the per fect solution for this task DIR ISO MADE IN GERMANY P SPLIT MADE IN GERMANY SUNDAY DRIVER S D DI You can of course also use a balanced input on your sound card or DAW to record the dry signal In this case it s a good idea to take a balanced signal from the ISO output of the LEHLE P SPLIT III please also see Balanced signal rout ing page 7 DEVICE CONNECTION LEHLE P SPLIT III D...

Page 18: ...balanced signals from a sound card or a DAW HOW TO DO THIS 1 Connect your sound card or DAW to the input socket 1 of the LEHLE P SPLIT III 2 Do not use the DIR socket 2 3 Connect the ISO socket 5 to the input of your amp 4 Use the ground lift switch 4 to deter mine which position eliminates the most background noise 5 There you go DEVICE CONNECTION Input Signal source un balanced Output Signal inp...

Page 19: ...ound connection see Types of signal routing pages 6 7 HOW TO DO THIS 1 Connect the balanced or unbalanced signal source to the input socket 1 of the Lehle P Split III 2 Do not use the DIR socket 2 3 Connect the balanced or unbalanced signal input to the ISO socket 5 4 Use the ground lift switch 4 to deter mine the position in which the most back ground noise is eliminated 5 There you go DEVICE CON...

Page 20: ...DAY DRIVER II to convert the unbal anced instrument signal to a balanced signal Up to 100m of cable can be connected to the TRS output socket The LEHLE P SPLIT III can be used at the end of the line to convert the balanced signal back to an unbalanced signal for input to your amp This system makes it possible to convey the signal across great distances without signal losses DIR ISO MADE IN GERMANY...

Page 21: ...nce the impedance matches If you are passively summing mono sig nals out of two different devices it can cause an impedance mismatch with the result that one signal is very low in volume and presence HOW TO DO THIS 1 Connect the left side of the stereo sig nal to the input socket 1 of the LEHLE P SPLIT III 2 Connect the right side of the stereo signal to the output socket DIR 2 Here this socket is...

Page 22: ...22 LEHLE GmbH Germany www lehle com support lehle com ISO 5 PHASE 3 GROUND 4 DIR 2 INPUT 1 LEHLE P SPLIT III SIGNAL FLOW DIAGRAM ...

Page 23: ... GmbH Germany www lehle com support lehle com LEHLE GmbH Grenzstrasse 153 46562 Voerde Germany www lehle com support lehle com LEHLE P SPLIT III OPERATING INSTRUCTIONS EN V1 0 2019 08 01 Copyright 2019 by LEHLE ...

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