Lehle Stereo Volume
Lehle Stereo Volume
www.lehle.com
User Manual
Lehle GmbH • Grenzstr. 153 • D-46562 Voerde • Germany • Tel +49 (0) 2855 850070
Dear Musician,
Thank you for purchasing your Lehle Stereo Volume!
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
Stereo Volume comprises only the very best components. Every module of your
Lehle Stereo Volume has been made and tested in Germany.
To make sure that you can enjoy your Lehle Stereo Volume for a long time, it
is of extremely robust design and construction. If you should nonetheless have a
problem, or simply a question, just mail me or a member of the Lehle team at:
[email protected]
I wish you much pleasure and success with your Lehle Stereo Volume!
Burkhard Georg Lehle
Contents
Introduction...................................................................................................................................2
Technical data............................................................................................................................ 3
General description ..................................................................................................................4
Typical uses
- Lehle Stereo Volume as a classic volume pedal for keyboards, synthesizers,
samplers or any kind of stereo-sources.......................................................................... 10
- Lehle Stereo Volume controlling the master volume with stereo effects
and distributing it to two amps................................................................................... 11
- Lehle Stereo Volume for guitars or basses with stereo-outputs for use
with two amps..............................................................................................................12
- Lehle Stereo Volume controlling the effects signals........................................................ 14
- Lehle Stereo Volume controlling guitars or basses with mono-outputs,
using two amps........................................................................................................ 15
- Lehle Stereo Volume controlling the master volume with two signals,
summing it on one amp................................................................................................17
Lehle Stereo Volume signal flow diagram............................................................................... 18
1
The Lehle Stereo Volume is a volume pedal
equipped with a precise magnetic sensor enabling
it to operate almost wear-free. This sensor uses the
Hall effect, named after Edwin Hall, to measure
the strength of magnetic fields. In the Lehle
Stereo Volume the Hall sensor, which is made
in Germany, is accurately calibrated to the built-in
magnet and the control range of the pedal. The
pedal moves only the magnet, while the distance is
measured by the Hall sensor which controls a VCA.
A premium Blackmer® Stereo VCA (= Voltage Controlled Amplifier) from the United States replaces
here the mechanical potentiometer. The principle
of the voltage-controlled amplifier is based on the
fact that gain can be varied by the control voltage
coming from the Hall sensor. This technique allows
to operate more precisely than conventional
mechanical potentiometers or optical sensors used
by the standard volume pedals. In addition the
potentiometer-typical noise and the complicated
adjustment are eliminated.
Over the entire control range the Lehle Stereo
Volume transmits the full sound spectrum of the
connected instrument. The input and output im-
2
pedance always stay the same, ensuring that there
will be no damping of higher frequencies as with
potentiometers.
Internally, the input voltage coming from the power
supply socket of the pedal is rectified, then filtered,
stabilized and doubled to 18 V, thus achieving a
total dynamic range of 110 dB with a high level
stability. The two outputs can tapped unbalanced
by TS plugs or balanced by TRS plugs.The volume
control of the Lehle Stereo Volume ranges from
-92 dB to 0 dB - so from a virtually muted level to
the same volume.
The Lehle Stereo Volume runs mechanically
extremely smooth and steady, as it is equipped
with low-friction bearings of a high-performance
polymer, and there is no mechanical transmission
of the pedal to other components. By means of an
adjusting screw the mobility of the pedal can be
modified very precisely.
Technical data
Weight:
Length:
Width:
Overall height:
Voltage:
Power consumption:
Frequency range:
THD:
Input:
Output:
Signal-to-noise ratio:
Max level:
1,680 g
26 cm (10.24‘‘)
10 cm (3.94‘‘)
6.6 cm (2.6‘‘)
9 - 15 V DC or 7 - 12 V AC
62 mA
20 Hz - 100 kHz (+/- 0,2 dB)
< 0,05 % at 1 kHz, -10 dBu
TS jack unbalanced, 2 MOhm
TRS jack balanced, 500 Ohm
-100 dB at 1 kHz, 0 dBu A weighted
3 V RMS (approx. 12 dBu at 12 V input voltage)
3
General description
4
1. IN 1 Input jack
 Connect the left output of your instrument or your stereo
source here.
The Lehle Stereo Volume processes signals
of synthesizers, keyboards, electric and acoustic
instruments of all kinds, as well as samplers and
effects units. The input impedance of the Lehle
Stereo Volume is approx. 2 MOhm. It does not
matter whether the connected signal has high or
low impedance, or if it comes from a passive or an
active pickup system.
If only this jack is connected, the input signal will
nonetheless be distributed to both outputs.
2. IN 2 Input jack
 Connect the right output of your instrument or your
stereo source here.
If this socket remains free, the signal from IN 1
will be distributed to both outputs (OUT 1 and
OUT 2).
3. OUT 1 Output jack
 Connect the left input channel of your target device
here.
For instance, this would be an amplifier, a mixing
desk, an effects unit or an audio interface. The two
outputs (OUT 1 and OUT 2) have low impedance
and do not change their output impedance when the
volume is altered via the volume pedal. Both outputs
are balanced and can be tapped by TRS plugs (or
unbalanced with TS plugs).
If the OUT 2 jack remains free whilst both inputs are
connected, the Lehle Stereo Volume merges the
input signals and sends them to OUT 1.
4. OUT 2 Output jack
 Connect the right input channel of your target device
here.
If this socket remains free whilst both inputs are
connected, the Lehle Stereo Volume merges the
input signals and sends them to OUT 1.
5. External power supply
 Connect your external power supply here (9 -15 V DC
or 7 -12 V AC).
For the Lehle Stereo Volume an external power
supply is required.
This should provide a minimum of 9 V and no
more than 15 V DC, but alternatively you can also
connect an AC voltage source with more than 7
5
or up to 12 V. The polarity is not relevant. The
voltage supplied is internally rectified, filtered,
stabilized and then brought to 18 V.
6
6. Pedal Feel
 Turn this screw to adjust the feel of the pedal.
If you turn this screw clockwise, you tighten the
brake. This way the pedal feel will be heavier.
Turning the screw counterclockwise, diminishes the
resistance when pressing and gives the pedal a
lighter feel.
7
7. Base and fixing
 You can use the fixing screws supplied with the Lehle
Stereo Volume to fix to it to a base plate (or to a pedal
board, for example).
The base of the Lehle Stereo Volume can be
easily attached on any base plate with Velcro or
using the supplied screws. First, we recommend
you to pull out the rubber pads on the bottom. If
a rubber buffer gets lost in this process or breaks,
you will get a replacement at any time.
Fixing the Lehle Stereo Volume with screws:
Place the volume pedal without the rubber buffers
in the position where you want to attach it to the
board. Use a fine-point pen or a sharp pencil to
sketch the subsequent screw holes through the
mounting holes onto the base plate. Now drill
at the site of the later screw holes a hole with a
diameter of approximately 2.5 mm (1/10 inch).
Then turn in the two screws for the u-shaped
mounting holes together with the washers just
halfway.
8
Slide the volume pedal with the U-shaped mounting holes under the screw heads of the screws
already screwed in. Make sure that the washers
are placed between the bottom plate of the Lehle
Stereo Volume and the screw head, to protect
the paint.
Now you can turn in the remaining two screws
and spacers through the two round mounting
holes next to the jack plugs. Tighten those screws
only slightly, then fix the screws you first turned in.
This type of mounting is extremely stable and can
also be easily removed.
Tip: In case you prefer a Velcro solution for your
pedal board we recommend to write down the
serial number of the pedal for eventual support
matters before covering it.
Typical uses
9
Lehle Stereo Volume as a classic volume pedal for keyboards, synthesizers, samplers or
any kind of stereo-sources
The main purpose of the Lehle Stereo Volume
certainly is to vary the volume of the connected
source.
Connection of units:
Input IN 1 →
Source L
Input IN 2 →
Source R
Output OUT 1→ Mixer L
Output OUT 2→ Mixer R
How to do this:
1. Connect your keyboard, your synthesizer,
sampler or an other stereo source to the input
sockets (1 and 2) of the Lehle Stereo Volume.
2. Connect the outputs (3 and 4) of your Lehle
Stereo Volume to a stereo input of your mixer
or use two mixer channels with hard panning.
3. There you go!
10
Lehle Stereo Volume controlling the master
volume with stereo effects and distributing
it to two amps
ISO
DIR
Lehle
P-Split
High Impedance Splitter
With this setup you can distribute the stereo-sound
coming from your effects unit to two amplifiers,
e.g. to make ping-pong-delays or other stereo
effects audible directly from the stage. Using the
Lehle P-Split II, between one output and the second amplifier is optional, in case ground loops or
phase cancellations occur. These will be eliminated effectively by using the Lehle P-Split II.
Connection of units:
Input IN 1 → Effects unit L OUT
Input IN 2 → Effects unit R OUT
Output OUT 1 → Amplifier 1
Output OUT 2 → Lehle P-Split II Input
Lehle P-Split II ISO output → Amplifier 2
How to do this:
1. Connect your effects unit to the input jacks (1
and 2) of the Lehle Stereo Volume.
2. Connect your amplifier to OUT 1 (3).
3. Connect OUT 2 (4) with the input jack of the
Lehle P-Split II.
4. Connect the ISO output of Lehle P-Split II with
the input of the second amp.
5. Now press the ground switch of the Lehle
11
P-Split II and find out in which position you
have the least noise. In order to eliminate phase
cancellation, press the phase switch.
6. There you go!
Lehle Stereo Volume as volume pedal for
guitars or basses with stereo-outputs for use
with two amps
ISO
DIR
Lehle
P-Split
High Impedance Splitter
12
Many instruments offer separate output jacks for
neck- and bridge-pickups. Others have separate
outputs for magnetic- and piezo-pickups. With the
Lehle Stereo Volume you can control the output
volume of the two outputs simultaneously without
merging the signals. This way the pickups can be
sent to different amplifiers or different channels
of the mixer. Using the Lehle P-Split II, between
one output and the second amplifier is optional, in
case ground loops or phase cancellations occur.
These will be eliminated effectively by using the
Lehle P-Split II.
Lehle P-Split II.
4. Connect the ISO output of Lehle P-Split II with
the input of the second amp. Now press the
ground switch of the Lehle P-Split II and find
out in which position you have the least noise.
In order to eliminate phase cancellation, press
the phase switch.
5. There you go!
Connection of units:
Input IN 1 → Instrument OUT 1
Input IN 2→ Instrument OUT 2
Output OUT 1 → Amplifier 1
Output OUT 2 → Lehle P-Split II Input
Lehle P-Split II ISO output → Amplifier 2
How to do this:
1. Connect your instrument to the input sockets (IN 1
and IN 2) of the Lehle Stereo Volume.
2. Connect your amplifier 1 to OUT 1 (3).
3. Connect OUT 2 (4) with the input socket of the
13
Lehle Stereo Volume controlling the effects
signals
Even working at the mixing console can be made
easier with the Lehle Stereo Volume, e.g. if
specific effects shall be integrated. You can work
hands-free and control the sound precisely and
reliably via the Lehle Stereo Volume.
Connection of units:
Input IN 1 → Mixer (AUX) send L
Input IN 2 → Mixer (AUX) send R
Output OUT 1 → Stereo effects unit IN L
Output OUT 2 → Stereo effects unit IN R
Stereo effects unit IN L → Mixer return L
Stereo effects unit IN R → Mixer return R
How to do this:
1. Connect the auxiliary outputs of your mixer to
the input sockets (1 and 2) of the Lehle Stereo
Volume.
2. Connect the outputs (3 and 4) of the Lehle
Stereo Volume with the inputs of your stereo
effects unit.
3. Connect the outputs of the stereo effects unit with
the aux return inputs of your mixer.
4. There you go!
14
Lehle Stereo Volume controlling guitars or
basses with mono-outputs, using two amps
ISO
If the input socket IN 2 remains free, the Lehle
Stereo Volume sends the input signal from IN
1 not only to OUT 1 but also to OUT 2. Thus, a
mono input signal can be processed as a dual
mono signal coming from the Lehle Stereo
Volume. Using the Lehle P-Split II, between
one output and the second amplifier is optional, in
case ground loops or phase cancellations occur.
These will be eliminated effectively by using the
Lehle P-Split II.
DIR
Lehle
P-Split
High Impedance Splitter
Connection of units:
Input IN 1 → Instrument
Input IN 2 → (remains free)
Output OUT 1 → Amplifier 1
Output OUT 2 → Lehle P-Split II Input
Lehle P-Split II ISO output → Amplifier 2
How to do this:
1. Connect your instrument to the input jack (1) of
the Lehle Stereo Volume.
2. Connect your amplifier to OUT 1 (3).
3. Connect OUT 2 (4) with the input socket of the
Lehle P-Split II.
4. Connect the ISO output of Lehle P-Split II with
15
the input of the second amp. Now press the
ground switch of the Lehle P-Split II and find
out in which position you have the least noise.
In order to eliminate phase cancellation, press
the phase switch.
5.There you go!
16
Lehle Stereo Volume controlling the master
volume of two signals, summing it on one
amp
With this setup you can merge two different signals
or a stereo signal to one mono signal, control the
volume and send the mono signal to an amp.
Connection of units:
Input IN 1 → Sound source 1
Input IN 2→ Sound source 2
Output OUT 1 → Amplifier
How to do this:
1. Connect your sound sources to the input jacks (1
and 2) of your Lehle Stereo Volume.
2. Connect an amplifier to output OUT 1.
3. There you go!
17
Lehle Stereo Volume signal flow diagram
Hall-Sensor
OUT 1
IN 1
VCA 1
OUT 2
IN 2
VCA 2
18
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