Lehle PARALLEL SW II Operating Instructions Manual

OPERATING INSTRUCTIONS
LEHLE PARALLEL SW II

Dear Musician!

Thank you for purchasing the LEHLE PAR­ALLEL SW II!
I have been building units that switch,
split and route signals with no technical
compromises and with maximum musi­cal fidelity since 1999. Your new LEHLE
PARALLEL 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 ex­tremely 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:

[e-mail]

I wish you the very greatest pleasure and
success using your LEHLE PARALLEL SW
II!

LEHLE GmbH · Germany · w ww.le hle.com · suppor t@le hle.com

CONTENT

Introduction

4

Technical data

6

General description

7

Selecting the foot switch mode

12

Typical uses of the LEHLE PARALLEL SW II as
parallel eects looper

13

parallel eects looper in the loop of an amplifier

15

mixer for two input signals

17

mixer for two pickups of an instrument

19

Signal flow diagram

20

LEHLE GmbH · Germany · w ww.le hle.com · suppor t@le hle.com

The LEHLE PARALLEL SW II is a compact

INTRODUCTION

and versatile line mixer designed to meet
the highest tonal standards.

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

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

All connections are realised in stereo, so
your stereo eects pedals can be placed
into the signal path of the LEHLE PARAL­LEL SW II.

Thanks to the discrete Class A input
stages with JFET technology, the LEHLE
PARALLEL SW II‘s inputs can handle high­impedance 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 ste­reo signals. You can easily integrate ef-

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

To exploit the dynamics of tube amplifi­ers to the full, the input voltage is rectified
from the power supply socket, then fil­tered, stabilized and transformed to 30 V.

The LEHLE-Switch works with a micro­controller and an intelligent True-Bypass­Relay-Circuit with active pop suppression
circuit, thereby allowing the LEHLE PAR­ALLEL SW II to switch even faster than me­chanical switches, noise-free and without
we ar.

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

LEHLE GmbH · Germany · w ww.le hle.com · suppor t@le hle.com

4

Thus the electronics board is not exposed
to mechanical loads, making the LEHLE
PARALLEL SW II virtually indestructible
and guaranteeing years of trouble-free
switching.
The LEHLE PARALLEL SW II has three op­erating modes, making the switch work
as either a latching or momentary switch,
allowing for short or rhythmic stutter-ef­fects.

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 music.

LEHLE GmbH · Germany · w ww.le hle.com · suppor t@le hle.com

5

TECHNICAL DATA

Weight 480 g

Length

Width

Overall height

Supply voltage

Current consumption

Max input level

Max output level

Level noise floor

Total harmonic distortion

Frequency range

Impedance input

Impedance return

Impedance send

Impedance output

Max gain

3.9“

4.8“

1.85“

9-15 V DC

200 mA

+20 dBu

+22 dBu

-100 dBu (20 Hz - 20 kHz)

0.003 % (0 dBu, 1 kHz)

20 Hz – 100 kHz

2 MΩ

2 MΩ

220 Ω

220 Ω

+/-15 dB

LEHLE GmbH · Germany · w ww.le hle.com · suppor t@le hle.com

6

GENERAL DESCRIPTION

1

234567

R

8

11

PARALLEL

MADE IN GERMANY

1. INPUT SOCKET
Connect your instrument or the Send out­put of your amplifier to this socket.

The LEHLE PARALLEL SW II has a high­impedance input and can therefore ac­cept both low- and high-impedance sig­nals of all types, so that you can plug in
virtually any instrument you like:
electrical and acoustic stringed instru­ments, such as electric guitars and
basses, acoustic guitars and all types of

S

MIX

9

SR

10

1213

stringed instruments, and also the low­impedance signals from computers, key­boards and mixers.

If you want to use your LEHLE PARALLEL
SW II to inject an external eect into the
serial eects loop of your amplifier, con­nect the Send output of the amplifier to
this input socket.

LEHLE GmbH · Germany · w ww.le hle.com · suppor t@le hle.com

7