Lehle Little Dual II ABY Switcher

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• ABY switcher (A or B or both)

• Hum and noise-free switching

• High-impedance LEHLE TRANSFORMER HZ with phase and ground switch

• Two different operating modes

• Stereo-routing option

• Active pop suppression circuit

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 different 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 microcontroller and an intelligent True-Bypass-Relay-Circuit with active pop noise suppression 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 buttons 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 indestructible and guaranteeing years of trouble-free switching.

High-intensity LEDs make it easy to read off 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 TRANSFORMER 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 effects unit as the input, for example. This also makes it possible to route instruments equipped with two pickups, including 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 effective!

Top of enclosure: rouge vermillon 31

Bottom of enclosure: gris foncé 59

All colours by Le Corbusier's colour keyboards.

Q: What is galvanic isolation?

A: Background noise, generated by ground loops, occurs again and again when two electronic devices are connected to each other, and the Lehle Little Dual II provides a simple but extremely effective remedy when installed between the two units. The two devices are electrically isolated when the `A´ output is used, eliminating this background noise.

The protective earth conductor and the ground connection of the audio signal create a loop which will pick up external interference generated, for example, by coils. Such interference will impair the signal. The Lehle LTHZ transformer included in the Lehle Little Dual II galvanically isolates the ground connection. The hum loop is thus broken at this point.

Q: Does the galvanic isolation color my sound?

A: No, neither sound nor dynamics will be altered, the signal is passing the switcher without any loss in strength or frequency. We use our self-developed Lehle LTHZ transformers for this, the selection of high quality components guarantees a rich sound throughout the full frequency range.

Q: Is the signal suitable for a mixer/recorder? I would like to play thru my effects and simultaneously record a dry signal for later re-amping.

A: No problem, just make sure the mixer/recorder features a HiZ input, otherwise the instrument will sound flat and lifeless. Optional the output signal can be balanced by using a TRS to XLR connection.

Q: Can I use the Little Dual II for acoustic guitars with onboard preamp?

A: Absolutely! The switcher works passively and can handle all kinds of audio signals without distortion or loss, for weaker piezo signals as well as stronger line level signals.

Q: Can the Little Dual II be used as DI box since it has 14" sockets?

A: Yes, you get a balanced or unbalanced (mono-) signal from transformer-isolated output A when using a stereo (TRS) cable.




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