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LEHLE GmbH · Germany · www.lehle.com · [email protected]

The LEHLE PARALLEL SW II is a compact 
and versatile line mixer designed to meet 
the highest tonal standards.

The LEHLE PARALLEL SW II mixes the 
signals from your effects units into your 
original signal, either before an amp or 
inserted into its effects loop. You can ad-
just send and return levels separately, and 
finely balance the effects signal to the 
original signal using the mix controller. 

All connections are realised in stereo, so 
your stereo effects pedals can be placed 
into the signal path of the LEHLE PARAL-
LEL SW II.

Thanks to the discrete Class A input 
stages with JFET technology, the LEHLE 
PARALLEL SW II‘s inputs can handle high-
impedance signals - from electric guitars, 
basses or acoustic instruments - as well as 
low-impedance signals - from keyboards, 
active electric guitars and basses - with a 
broad output range extending from 20 to 
100,000 Hz. 

With the new LEHLE PARALLEL SW II it is 
now possible to combine mono and ste-
reo signals. You can easily integrate ef-

fects pedals with mono input and stereo 
output into the signal path of the LEHLE 
PARALLEL SW II without limitations.

The great dynamic range of the LEHLE 
PARALLEL SW II makes it possible to 
blend rack-mount studio effects units with 
low-impedance line level into the guitar 
signal path, or insert effects pedals with 
their level-adjusted into an amp‘s effects 
loop. 

To exploit the dynamics of tube amplifi-
ers to the full, the input voltage is rectified 
from the power supply socket, then fil-
tered, stabilized and transformed to 30 V. 

The LEHLE-Switch works with a micro-
controller and an intelligent True-Bypass-
Relay-Circuit with active pop suppression 
circuit, thereby allowing the LEHLE PAR-
ALLEL SW II to switch even faster than me-
chanical switches, noise-free and without 
wear.

The easy-action mushroom-shaped but-
ton characteristic of LEHLE products is 
mounted in the cover, so that your foot 
pressure is transmitted indirectly, via a 
spring. 

INTRODUCTION

Summary of Contents for PARALLEL SW II

Page 1: ...OPERATING INSTRUCTIONS LEHLE PARALLEL SW II ...

Page 2: ...SW II comprises only the very best components Every assembly of your LEHLE PARALLEL SW II has been made and tested in Germany Your LEHLE PARALLEL SW II is of ex tremely robust 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 ...

Page 3: ...ata General description Selecting the foot switch mode Typical uses of the LEHLE PARALLEL SW II as parallel effects looper parallel effects looper in the loop of an amplifier mixer for two input signals mixer for two pickups of an instrument Signal flow diagram 4 6 7 12 13 15 17 19 20 ...

Page 4: ...m 20 to 100 000 Hz With the new LEHLE PARALLEL SW II it is now possible to combine mono and ste reo signals You can easily integrate ef fects pedals with mono input and stereo output into the signal path of the LEHLE PARALLEL SW II without limitations The great dynamic range of the LEHLE PARALLEL SW II makes it possible to blend rack mount studio effects units with low impedance line level into th...

Page 5: ...ble free switching The LEHLE PARALLEL SW II has three op erating modes making the switch work as either a latching or momentary switch allowing for short or rhythmic stutter ef fects The third mode combines a mixture of operating mode one and two a short hit is latching a long hit is momentary Placing no limitations on your creativity We take care of your signal so that you can take care of the mu...

Page 6: ... 2 MΩ 0 003 0 dBu 1 kHz 220 Ω 100 dBu 20 Hz 20 kHz 2 MΩ 20 Hz 100 kHz 220 Ω 15 dB 20 dBu Length Max output level Width Level noise floor Overall height Total harmonic distortion Supply voltage Frequency range Current consumption Impedance input Impedance send Max input level Impedance return Impedance output Max gain ...

Page 7: ...nce sig nals of all types so that you can plug in virtually any instrument you like electrical and acoustic stringed instru ments such as electric guitars and basses acoustic guitars and all types of stringed instruments and also the low impedance signals from computers key boards and mixers If you want to use your LEHLE PARALLEL SW II to inject an external effect into the serial effects loop of y...

Page 8: ...ed in stereo to the return 5 and sent out to the output 6 in stereo If the LEHLE PARALLEL SW II is deactivat ed the mono signal will be split straight after the input and sent loss free to the output 6 3 SEND SOCKET Connect the input of your effects unit or the input of your target device e g mixer computer etc to this socket If you re using the LEHLE PARALLEL SW II for parallel effects loops conn...

Page 9: ... in stereo as well Please refer to paragraph 2 Mono to stereo switch on page 8 6 OUTPUT SOCKET Connect your amplifier or the Return in put from the serial effects loop of your amplifier to this socket The device connected here will mostly be an amplifier but can also be a mixer a stage box or a sound card The signal mixed from the input and the return signal is available here The mixing ratio can ...

Page 10: ...n signals The two signals have equal strength when this controller is in its center position Turn the MIX controller to the left to increase the Return signal and decrease the Input signal The Input signal is increased and the Return signal decreased when you turn the controller to the right 11 RETURN CONTROLLER Set the level of the Return signal here The signal on the Return input is transmit ted...

Page 11: ... can be mount ed to a plate such as a pedalboard using the two holes in the bottom of the pedal You can find the optional LEHLE Mount ing Kit V3 order number 100981 online at www lehle components com To mount undo the four housing screws by using a 2 5 mm Allen key and detach the cover Then fix the device base to a base plate using the two screws the washers and the spacers of the Mounting Kit Att...

Page 12: ...ng and momentary A short press lets the foot switch act as latching a longer press is momentary To change the mode please proceed as follows 1 Disconnect the power supply 2 Press and hold the foot switch 3 Reconnect the power 4 The LED starts flashing in following order for Latching Mode for Momentary Mode for Mixed Mode 5 If you release the foot switch after the first flash the Latching Mode is s...

Page 13: ...al Minimum noise The ability to adjust the level of the effects device connected using the Send and Return controllers means that noise is reduced to the absolute mini mum It can be a good idea to increase the Send level when using effects units that generate a lot of background noise since this enables you to get more signal and less noise in the effects sound DEVICE CONNECTION Input Send Instrum...

Page 14: ...of the effects unit con nected 6 Use the MIX controller 10 on the LEH LE PARALLEL SW II to select the desired effect level 7 Use the True Bypass switch 12 to switch between the instrument s original signal LED white and the mix of original and the effect signal the LED will then show blue 8 Done No sound losses in Bypass mode The LEHLE Switch 12 working with a micro controller and an intelligent T...

Page 15: ...h intensity and depth everything that makes up the unique sound of a good tube amplifier when digital effects processors are used in a serial effects loop With the LEHLE PARALLEL SW II however you can add the effect signal to the original sound with the pleasing result that you lose none of your amplifier s excellent sound char acteristics and don t have to sacrifice the effects you love HOW TO DO...

Page 16: ...tune the level of the effects unit con nected 6 Select the desired effect level using the MIX controller 10 on the LEHLE PARAL LEL SW II 7 Use the True Bypass switch 12 to switch between the original signal LED white and the mix of the original and ef fect signals the LED will then show blue 8 Done Check the overall sound for any phase cancellations and if necessary press the phase reverse switch ...

Page 17: ...or mixing of two preamps effects units or for musicians who like to mix their instrument signals electric guitar or bass plus a synthesizer and don t want to switch but rather mix their signals live it optimally combines these signals into one overall signal HOW TO DO THIS 1 Connect the output from your first de vice to the Input socket 1 of the LEHLE PARALLEL SW II 2 Connect the output from your ...

Page 18: ...show blue and the signal from device 1 only LED white 7 Done If you connect a mono signal to the in put socket 1 and a stereo signal to the return socket 5 please press the mono to stereo switch 2 too Check the overall sound for any phase cancellations and if necessary press the phase reverse switch 4 on the LEHLE PARALLEL SW II MADE IN GERMANY PARALLEL S R S R MIX MADE IN GERMANY PARALLEL S R S R...

Page 19: ...ull and rich again HOW TO DO THIS 1 Connect your instrument s first pickup to the Input socket 1 of the LEHLE PAR ALLEL SW II 2 Connect your instrument s second pickup to the Return input 5 3 Use the Return controller 11 to set the sensitivity for your second pickup 4 Use the MIX controller 10 on the LEHLE PARALLEL SW II to set the required mixing ratio for the two pickups 5 Connect your amplifier...

Page 20: ...mbH Germany www lehle com support lehle com LEHLE PARALLEL SW II SIGNAL FLOW DIAGRAM INPUT 1 SEND 3 RETURN 5 RETURN CONTROLLER 11 SEND CONTROLLER 9 MIX CONTROLLER 10 PHASE 4 OUTPUT 6 TRUE BYPASS SWITCH 12 MO ST 2 ...

Page 21: ...mbH Germany www lehle com support lehle com LEHLE GmbH Grenzstrasse 153 46562 Voerde Germany www lehle com support lehle com LEHLE PARALLEL SW II OPERATING INSTRUCTIONS EN V1 0 2019 08 01 Copyright 2019 by LEHLE ...

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