
OPERATING INSTRUCTIONS
LEHLE SUNDAY DRIVER II
LEHLE SUNDAY DRIVER II#
Dear Musician!
Thank you for purchasing the LEHLE SUNDAY DRIVER 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 II comprises only the very best components. Every assembly of your LEHLE SUNDAY DRIVER II has been made and tested in Germany.
Your LEHLE SUNDAY DRIVER 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 lots of fun and success with the LEHLE SUNDAY DRIVER II.

General Description#
1. INPUT SOCKET
Connect your instrument to this socket.
The LEHLE SUNDAY DRIVER 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. 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). If you want to operate the LEHLE SUNDAY DRIVER II via external phantom power, you need to use a TRS jack.
4. DI SWITCH
Press this switch to use the LEHLE SUNDAY DRIVER II as a DI box or balanced cable driver.
If you press the DI switch, the pedal becomes a compact DI box with preamp, powered by the external phantom power of a mixer or audio interface.
Use a balanced TRS jack for the output jack (#). Connect the jack, press the DI switch and then activate the external phantom power on your target device.
The DI switch reduces the output level by -6 dB, so balanced inputs like mic preamps aren’t overdriven or clipped.
If the level is then too low, you can make up the level again by using the gain controller (#).
5. EXTERNAL POWER SUPPLY
Connect a power supply with a voltage of 9 – 15 V.
In order for the LEHLE SUNDAY DRIVER 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 II.
If you want to operate the LEHLE SUNDAY DRIVER II via external phantom power please refer to paragraph „4. DI Switch“.
6. 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 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 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 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 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.
7. BASE AND FIXING
If required, mount the LEHLE SUNDAY DRIVER II to a pedalboard using the mounting kit.
The LEHLE SUNDAY DRIVER II can be mounted to a plane 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 2.5mm 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 II is designed to perform both tasks perfectly.
Typical Uses in the Studio#
The LEHLE SUNDAY DRIVER 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.
Signal Flow Diagram#
