OPERATING INSTRUCTIONS

LEHLE SUNDAY DRIVER SW II

LEHLE SUNDAY DRIVER SW II#

Dear Musician!

Thank you for purchasing the LEHLE SUNDAY DRIVER 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 SUNDAY DRIVER SW II comprises only the very best components. Every assembly of your LEHLE SUNDAY DRIVER SW II has been made and tested in Germany.

Your LEHLE SUNDAY DRIVER 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:
support@lehle.com

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

INTRODUCTION#

The LEHLE SUNDAY DRIVER SW II is a compact high-end preamp for all types of electric and acoustic instruments

– a preamp for electric and acoustic guitars and basses, not to mention other stringed instruments (such as violins, cellos and double basses) to realize their full musical potential.
The switchable version expands on the classic LEHLE SUNDAY DRIVER II with a soft-touch foot switch, to activate and deactivate the pedal.

The LEHLE-Switch works with a microcontroller and an intelligent True-Bypass-Relay-Circuit with active pop suppression circuit, thereby allowing the LEHLE SUNDAY DRIVER SW II to switch even faster than mechanical switches, noise-free and without wear.

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. Thus the electronics board is not exposed to mechanical loads, making the LEHLE SUNDAY DRIVER SW II virtually indestructible and guaranteeing years of trouble-free switching.

When ON, its circuit is based on a discrete Class A circuit with JFET technology and provides two modes of operation, selected by a mode selector switch with gold-plated contacts:

„D“ stands for Driver: in this mode, your guitar signal is amplified, with absolutely no modification, at the input impedance of a guitar amp, efficiently eliminating losses on the route through leads and effects; the signal remains strong and clear, retaining its full dynamics.

The second setting „S“ – as in Sunday – multiplies the input impedance by five, bringing out previously inaudible details and, as gain increases, giving your guitar a characteristic and unmistakable warmth that has given this preamp its name – the result is a sound as mellow as a sunny Sunday afternoon.

Even at the maximum +18 dB gain setting, the LEHLE SUNDAY DRIVER II always stays clean and absolutely free of background noise, thanks to its studio-standard overall dynamic range of 130 dB. To exploit the dynamics of tube amplifiers to the full, the input voltage is also rectified from the power supply socket, then filtered, stabilized and transformed to 30 V.

When OFF, the LEHLE SUNDAY DRIVER SW II provides two different modes of operation: in TB (= True Bypass) mode, the input and output are linked via relay, with zero tonal loss. True-Bypass mode is the best option if you have a small setup with short cable routings and for when a treble booster or old-school fuzz pedal is placed after the LEHLE SUNDAY DRIVER SW II.

If you have long cables or a complex effects board configuration, switch to TS (= True Sound) mode, and the LEHLE SUNDAY DRIVER SW II is active as a buffer, without amplifying the signal in any way. In this mode, the LEHLE SUNDAY DRIVER SW II operates as a neutral line driver and works with 5 MOhm or 1 Mohm input impedance – depending on the selected S or D mode.

The Bypass mode option enables you to effortlessly and tone-fully integrate the LEHLE SUNDAY DRIVER SW II into any setup, no matter how complex.
And not just on Sundays!

We take care of your signal so that you can take care of the music.

TECHNICAL DATA#

Weight350 g
Length3.55“
Width3.8“
Overall height1.85“
Supply voltage9 – 15 V DC
Current consumption165 mA
Max. Input level (with power supply)+20 dBu
Max. Output level (with power supply)+22 dBu
Level noise floor-110 dBu (20 Hz – 20 kHz)
Total harmonic distortion0.008 % (0 dBu, 1 kHz)
Frequency range20 Hz – 100 kHz
Input impedance D-mode1 MΩ
Input impedance S-mode5 MΩ
Output impedance220 MΩ
Max. Gain 18 dB

General Description#

1. INPUT SOCKET
2. S/D-SELECTOR SWITCH
3. TS/TB-SELECTOR SWITCH
4. OUTPUT SOCKET
5. EXTERNAL POWER SUPPLY
7. GAIN-CONTROLLER
6. LED
8. TRUE-BYPASS-SWITCH
9. BASE AND FIXING

1. INPUT SOCKET 

Connect your instrument to this socket.

The LEHLE SUNDAY DRIVER SW II processes signals from electric and acoustic stringed instruments, such as electric guitars and basses, western guitars, classical guitars and all kinds of stringed instruments. This compact preamp has no trouble balancing out low signal levels, and eliminating sound losses caused by long cables and treble pickups.

2. S/D-SELECTOR SWITCH 

Use this switch to select the mode you want.

This gold-plated contact switch enables you to change between the two sound modes. Mode D for ”Driver” (switcher pressed) selects neutral amplification, and the incoming signal is amplified at the input impedance of a guitar amp, 1 MOhm, efficiently eliminating sound losses caused by long cables and/or multiple effects. The signal remains strong and clear, and retains its dynamics.

In mode S for ”Sunday” (switcher not pressed), the input impedance is multiplied by five, to 5 MOhm, making previously unheard details suddenly audible whilst imparting an unmistakable and characteristic warmth to the sound when the gain knob is turned up.

3. TS/TB-SELECTOR SWITCH 

Use this switch to select the bypass mode you want.

In OFF status, the LEHLE SUNDAY DRIVER SW II provides two different modes of operation. In TB for “True-Bypass” mode, the input and output are linked with zero losses to one another via an intelligent True-Bypass-Relay-Circuit with active pop suppression circuit.

True-Bypass mode (switch pressed) is the best option for a small setup with short cable routings and for when a treble booster or a classic fuzz pedal is looped in after the LEHLE SUNDAY DRIVER SW II.

The line driver function, located at the start of the signal or in an effects chain, is the better solution for long cables and for complex effects board configurations. Switch the LEHLE SUNDAY DRIVER SW II to TS for “True Sound” mode, and it is active as a buffer, without amplifying the signal in any way. In this mode, the LEHLE SUNDAY DRIVER SW II operates as a neutral line driver and works with 5 MOhm or 1 Mohm input impedance – depending on the selected S or D mode.

4. OUTPUT SOCKET 

Connect your target device here.

For instance, an amplifier, a mixer panel, a stage box or a sound card. The output can be tapped unbalanced (TS jack) or balanced (TRS jack). To tap the output balanced, the LEHLE SUNDAY DRIVER SW II has to be either activated (LED blue) or the TS/TB-selector switch (3) set to “True Sound”.

5. EXTERNAL POWER SUPPLY 

Connect a power supply with a voltage of 9 – 15 V.

In order for the LEHLE SUNDAY DRIVER SW II to work flawlessly, it needs a current supply. This should supply a minimum of 9 V and a maximum of 15 V. Polarity is of no importance. The input voltage is rectified from the power supply socket, then filtered, stabilized and transformed to 30 V which guarantees maximum headroom.

In order to avoid noise it‘s recommendable to use a single power supply or an output of a multi power supply offering galvanically isolated outputs for the LEHLE SUNDAY DRIVER SW II.

6. LED

If the LED is showing blue, the gain controller and S/D-selector switch are active.

The high-intensity LEDs under the lenses clearly indicate the switching-state, even under stage lighting. If the LED is showing white, the LEHLE SUNDAY DRIVER SW II is in bypass and depending on the position of the TS/TBselector switch (3) in “True-Bypass” or “True Sound”.

7. GAIN CONTROLLER

Use the gain controller to adjust the intensity of the preamp from a slight level up to a powerful boost.

The gain control knob consists of black anodized aluminium and is recessed into the housing. It can be easily turned by placing your fingertip in the top depression, and thanks to the recessed design, your setting cannot be inadvertently disturbed on stage or during transportation. The LEHLE SUNDAY DRIVER SW II with its discrete Class A JFET circuitry performs two functions simultaneously – reducing signal impedance on the one hand, and boosting the signal on the other.

THE LEHLE SUNDAY DRIVER SW II AS AN IMPEDANCE CONVERTER:

When the gain controller is at the lefthand stop (in the ”0” or ”seven o’clock” position), it operates purely as an impedance converter. With the knob in this position, you can compensate for sound losses that can occur when long cables or multiple effects are used.

THE LEHLE SUNDAY DRIVER SW II AS A BOOSTER:

A buffer starts to amplify the signal when the gain controller is turned further in the clockwise direction. Tube amplifiers, preamps and distortion pedals can thus be driven slightly beyond the limit. Since the frequency response of tubes especially are not linear, the LEHLE SUNDAY DRIVER SW II ensures that the resultant overdrive distortion sounds harmonious and amplifies less treble in ”S” mode as the “Boost” rises. The result can range from a pleasant sound with no shrillness, up to a silky warm, harmonious overdrive distortion on tube amplifiers.

8. TRUE-BYPASS-SWITCH 

Use this switch to select between the original and the boosted signal.

The LEHLE SUNDAY DRIVER SW II switches all audio signals controlled by a microcontroller and an intelligent True-Bypass-Relay-Circuit with an active pop suppression function.

Triggered by the easy-action mushroom shaped button characteristic of LEHLE products mounted in the cover so that your foot pressure is transmitted indirectly via a spring. Thus the circuit board is not exposed to mechanical loads, making the LEHLE SUNDAY DRIVER SW II virtually indestructible and guaranteeing years of trouble-free switching. In OFF status, the LEHLE SUNDAY DRIVER SW II provides two different modes of operation, TB for “True-Bypass” and TS for “True Sound” mode. In ON state, the LED (6) shows blue, the gain controller is active and you can choose between the sound modes D for “Driver” and S for “Sunday”.

9. BASE AND FIXING 

If required, mount the LEHLE SUNDAY DRIVER SW II to a pedalboard using the mounting kit.

The LEHLE SUNDAY DRIVER SW II can be mounted to a plate such as a pedalboard using the two holes in the bottom of the pedal. You can find the optional LEHLE Mounting 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. Attach the cover and tighten the four housing screws – done!

For flexible solutions we recommend using 3M Dual Lock™ instead 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 before you cover it, in case you have a support question for us later and don‘t fancy dismantling your board!

Typical Uses Live#

Long cable runs and complex effects cascades on stage or in the concert hall can cause unwanted signal loss. Where electric guitars are used with tube amplifiers, an additional boost is often necessary, to generate a harmonious distortion. The LEHLE SUNDAY DRIVER SW II is designed to perform both tasks perfectly.

as Line Driver#

DEVICE CONNECTION

InputInstrument
OutputInput effect(s)

Electric guitarists and bassists often like to use a large range of effects switched one after the other, to get exactly the sound they want.

There is, however, a danger that the signal will lose clarity, treble and volume significantly due to the array of effects.

These sound losses occur due to the long cable runs and the large number of contact transitions on the plugs and sockets. You can visualize this loss of sound relatively easily by plugging a short instrument cable directly into the amplifier and then sending the signal through the effects chain.

This sound loss can be eliminated by positioning your LEHLE SUNDAY DRIVER SW II as a line-driver before the effects cascade in the signal path.

HOW TO DO THIS:

  1. Connect your instrument to the Input socket (1) of the LEHLE SUNDAY DRIVER SW II.
  2. Connect the first effects device in the serial chain to the Output socket (4) of the LEHLE SUNDAY DRIVER SW II.
  3. Activate the LEHLE SUNDAY DRIVER SW II via the foot switch (8) or set it to “True Sound” (3).
  4. Turn the Gain controller (7) to the left limit (“7 o’clock position“).
  5. There you go!

With some effects (e.g. treble booster, fuzz, vintage chorus or vintage echo), their sound characteristics may be altered by the LEHLE SUNDAY DRIVER SW II connected upstream. This can be remedied by using one or more LITTLE LEHLE III or LEHLE D.LOOP SGoS. This allows the effects to be passively switched into the signal path without altering their sonic characteristics.

AS A CABLE DRIVER#

DEVICE CONNECTION

InputInstrument
OutputAmplifier

The use of long connecting-cable runs on stage involves the danger of significant and audible losses of sound quality.

You can eliminate such losses by positioning the LEHLE SUNDAY DRIVER SW II as a cable driver in the signal path directly after your instrument.

The LEHLE SUNDAY DRIVER SW II has a low-impedance output, which stops sound losses caused by over-long cable runs.

The full sound quality stays in the signal even at cable runs of 20 meters.

HOW TO DO THIS:

  1. Connect your instrument to the Input socket (1) of the LEHLE SUNDAY DRIVER SW II.
  2. Connect the Output socket (4) of the LEHLE SUNDAY DRIVER SW II to your amplifier.
  3. Switch the S/D selector (2) in the D position, for “Driver“.
  4. Activate the LEHLE SUNDAY DRIVER SW II via the foot switch (8) or set it to “True Sound” (3).
  5. Turn the Gain controller (7) to the left limit (“7 o’clock position“).
  6. Done!

AS A BOOSTER#

DEVICE CONNECTION

InputInstrument
OutputAmplifier

The LEHLE SUNDAY DRIVER SW II can be used as a booster to provide your sound with rather more punch and presence on stage.

Experience demonstrates that electric guitars and basses can sound significantly better if the signal into the amplifier is boosted slightly.

With a low gain setting, the sound generated is pleasant, with absolutely no shrillness, while increasing gain level results in a silky-warm, harmonious overdrive distortion.

Please also take a look at Section 7 (Gain controller): the LEHLE SUNDAY DRIVER SW II as a booster.

HOW TO DO THIS:

  1. Connect your instrument to the Input socket (1) of the LEHLE SUNDAY DRIVER SW II.
  2. Connect your amplifier to the Output socket (4) of the LEHLE SUNDAY DRIVER SW II.
  3. Switch the S/D selector (2) in the S position, for “Sunday“.
  4. Activate the LEHLE SUNDAY DRIVER SW II via the foot switch (8).
  5. Turn the Gain controller (7) as much to the right until you hear the sound that you want.
  6. Done!

as DI box with preamp#

DEVICE CONNECTION

InputInstrument
OutputMixer or
stage box

The signals from piezo pickups, like those used on acoustic instruments, are often too weak for the line inputs of a mixer.

Pickups of passive basses can lose their strength and vitality due to long cables.

When recording, the LEHLE SUNDAY DRIVER SW II is again an ideal tool, turning a high-impedance instrument signal into a low-impedance instrument signal and amplifying it appropriately for the line input of a mixer.

Thanks to the optional balanced signal transfer, you’ll find the LEHLE SUNDAY DRIVER SW II is an ideal studio quality DI box in a compact form for use onstage.

HOW TO DO THIS:

  1. Connect your instrument to the Input socket (1) of the LEHLE SUNDAY DRIVER SW II.
  2. Connect the Output (4) of the LEHLE SUNDAY DRIVER SW II to the input of the mixer or stage box (unbalanced or balanced).
  3. According to the sensitivity of the connected instrument, switch the S/D selector (2) to position D or S.
  4. Activate the LEHLE SUNDAY DRIVER SW II via the foot switch (8).
  5. Adjust the Gain controller (7) so that the signal is optimal for your mixer.
  6. There you go!

In S mode and with a gain setting between 11-12 o’clock or more, instruments with piezo pickups – which can otherwise often sound very harsh and shrill – take on a pleasantly warm and silky tone.

Balanced signal lines are fitted with XLR connectors or TRS (Tip Ring Sleeve) jack plugs. In a balanced signal line, the signal is present in phase at the tip, as in the case of an unbalanced signal line (XLR Pin 2). The second signal conductor carries the same signal, but with the opposite polarity or mirror-image phase (Ring, XLR Pin 3). The third conductor is the screening, and again constitutes the signal ground (Sleeve, XLR Pin 1).

JACKCABLEXLR
SleeveGroundPin 1
RingSignal in mirrored phasePin 3
TipSignal in phasePin 2

Typical Uses in the Studio#

The LEHLE SUNDAY DRIVER SW II gives top performances not only on stage and in the concert hall, but also in the recording studio.

Its wide 20 to 100,000 Hz transmission range and extremely good signal-to-noise ratio makes it the ideal recording preamp.

as a Recording Preamp#

DEVICE CONNECTION

InputInstrument
OutputInput Audio interface

Audio interfaces (sound cards) often do not offer a high-quality or high-impedance input necessary for direct recording from an instrument.

If you then connect your instrument to the normal line input of an audio interface, the signal from the instrument is usually too weak. The result is that the wrong input impedance of the line input will significantly color the sound.

The LEHLE SUNDAY DRIVER SW II offers you the opportunity to amplify the sensitive signal of your instrument with its high-impedance input so that it becomes low-impedance and thus compatible with the audio interface. This gives you the true-to-original sound of your instrument in the digital recording.

By avoiding poor-quality or multiple preamps successively, you keep the noise floor at a very low level.

HOW TO DO THIS:

  1. Connect your instrument to the Input socket (1) of the LEHLE SUNDAY DRIVER SW II.
  2. Connect the output (4) of the LEHLE SUNDAY DRIVER SW II to the input of the audio interface (unbalanced or balanced).
  3. According to the sensitivity of the connected instrument, switch the S/D selector (2) in position D or S.
  4. Activate the LEHLE SUNDAY DRIVER SW II via the foot switch (8).
  5. Adjust the Gain controller (7) so that the signal is optimal for your audio interface.
  6. There you go!

If the inputs of your audio interface are balanced you can tap the LEHLE SUNDAY DRIVER SW II’s output in balanced with a TRS jack. For this take a look at “4. Output socket”.

as a recording preamp combined with the LEHLE P-SPLIT III#

DEVICE CONNECTION – LEHLE P-SPLIT III

InputOutput LEHLE
SUNDAY DRIVER II
OutputAmplifier
OutputInterface Low-Z

DEVICE CONNECTION – LEHLE SUNDAY DRIVER II

InputInstrument (passive)
OutputInput
LEHLE P-SPLIT III

It can be useful during a recording session to hear your instrument through an amplifier simultaneously, while recording.

This enables you to play your instrumental part with your usual sound, while your “dry” signal is recorded – a technique that has positive benefits for performance feel, therefore also for the recording, whilst offering the possibility of also sending the recorded signal to an amplifer and reamping it. The combination of the LEHLE P-SPLIT III and the LEHLE SUNDAY DRIVER SW II makes this method possible.

HOW TO DO THIS

  1. Connect your instrument to the Input socket (1) of the LEHLE SUNDAY DRIVER SW II.
  2. Connect the output (4) of the LEHLE SUNDAY DRIVER SW II to the input socket of the LEHLE P-SPLIT III.
  3. Connect your amplifier to the DIR output of the LEHLE P-SPLIT III.
  4. Connect the ISO output to the input of your audio interface.
  5. Switch the S/D selector (2) to the D position for “Driver”.
  6. Activate the LEHLE SUNDAY DRIVER SW II via the foot switch (8).
  7. Adjust the Gain controller (7) so that your amplifier sounds as good as usual.
  8. There you go!

The LEHLE P-SPLIT III also has other functions, such as inverting the phase at the ISO output or an extra galvanic separation of the signal to get rid of ground loop noise.

Please read the LEHLE P-SPLIT III operating manual for a precise explanation of the use and effects of those features.

Signal Flow Diagram#

Download Manual#

DOWNLOAD MANUAL