Lehle Little II User manual

OPERATING INSTRUCTIONS
LEHLE LITTLE DUAL II

LEHLE GmbH · Germany · www.lehle.com · [e-mail]
Dear Musician!
Thank you for purchasing your LEHLE
LITTLE DUAL 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
LITTLE DUAL II comprises only the very
best components.
Every assembly of your LEHLE LITTLE
DUAL II has been made and tested in
Germany.
Your LEHLE LITTLE DUAL 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 LITTLE DUAL II!

LEHLE GmbH · Germany · www.lehle.com · [e-mail]
CONTENT
Introduction
Technical data
General description
Selecting the operating mode
Selecting the foot switch mode
Restoring factory setting
Typical uses of the LEHLE LITTLE DUAL II as
amp-switcher
amp-switcher for stereo eects and 2 amplifiers
amp-switcher in a wet/dry system
amp-switcher for one instrument with piezo and magnetic pickup to two amps
amp-switcher for one instrument with piezo and magnetic pickup to one amp
and a mixer
tuner mute box
LEHLE LITTLE DUAL II signal flow diagram
4
6
7
12
13
14
15
16
18
20
21
23
24

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LEHLE GmbH · Germany · www.lehle.com · [e-mail]
INTRODUCTION
The LEHLE LITTLE DUAL II is the successor
to the Lehle Little Dual and is a maximum
signal-fidelity amp switcher for two amps.
By using the soft-touch switches you can
switch between two connected amplifiers
hum-free and without sound loss.
Two dierent operating modes are ready
for you. You decide if you want to activate
or deactivate every output individually or
if you want to switch between the amps
and activate the remaining one.
The LEHLE-Switches work with a micro-
controller and an intelligent True-Bypass-
Relay-Circuit with active pop noise sup-
pression circuit. Thereby they switch the
LEHLE LITTLE DUAL II even faster than
mechanical switches and in addition to
that wear- and noise-free.
The easy-action mushroom-shaped but-
tons characteristic of LEHLE products are
mounted in the cover, so that your foot
pressure is transmitted indirectly only, via
a spring. Thus the electronics board is not
exposed to mechanical loads, making the
LEHLE LITTLE DUAL II virtually indestruct-
ible and guaranteeing years of trouble-
free switching.
High-intensity LEDs make it easy to read
o switching state A or B, or both, even
under high-power spots.
The centrepiece of the LEHLE LITTLE
DUAL II is its high-end LEHLE TRANS-
FORMER HZ, which galvanically isolates
output A from output B, making history
of hum loops - permanently! The LEHLE
LITTLE DUAL II features a gold-plated
contact phase inverter and a gold-plated
contact ground switch. The two inputs
can also be routed in stereo to outputs
A and B, if you use the stereo signal of
an eects unit as the input, for example.
This also makes it possible to route in-
struments equipped with two pickups, in-
cluding many acoustic and hybrid guitars,
and also double basses, via two amplifier
systems - with no complications.
Additionally the LEHLE LITTLE DUAL II is
equipped with a TRS switch. Therewith it
is possible to send in above-mentioned
stereo- or dual-mono signals via a TRS
jack or “stereo-jack”.
These signals can be operated either in
alternation or in parallel - without hum,
and without sound losses, needless to
say.
The LEHLE LITTLE DUAL II - small, but so
utterly eective!
We take care of your signal so that you
can take care of the music.

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LEHLE GmbH · Germany · www.lehle.com · [e-mail]
TECHNICAL DATA
Weight 540 g
3.9“
4.8“
1.85“
9-15 V DC
63 mA
+20 dBu (THD < 1%, 50 Hz - 20 kHz)
0.003 % (0 dBu, 1 kHz)
min. 2 M at 2 kHz
20 Hz – 100 kHz -0.1/ +0.4 dB
(source 600 , load 1 M)
Length
Width
Overall height
Supply voltage
Current consumption
Max Level
Total harmonic distortion
Frequency range
Input impedance
(transformer load impedance)