Der LEHLE P-ISO steht für passives Isolieren mit höchster Signaltreue.
Die Anwendungsmöglichkeiten reichen von Isolieren und Beseitigen von Brummgeräuschen über Symmetrieren und Reamping bis hin zu Recordinganwendungen.
Das Herz des LEHLE P-ISO bildet der LEHLE TRANSFORMER HZ, der das Signal galvanisch trennt, wodurch du Masseschleifen und Brummen erfolgreich vermeiden kannst. Der LEHLE TRANSFORMER HZ wurde speziell für den Einsatz mit hochohmigen Signalen konzipiert, er verarbeitet aber ebenfalls niederohmige Signale mit kompromissloser Klangqualität.
Die klassische Anwendung findet der LEHLE P-ISO zur effektiven Beseitigung unerwünschter Brummgeräusche. 

The LEHLE P-ISO stands for passive isolation with maximum signal fidelity.
The possible applications range from isolating and eliminating hum to balancing, reamping and recording applications.
At the heart of the LEHLE P-ISO is the LEHLE TRANSFORMER HZ, which galvanically isolates the signal, allowing you to successfully avoid ground loops and hum. The LEHLE TRANSFORMER HZ was specially designed for use with high-impedance signals, but it also processes low-impedance signals with uncompromising sound quality.
The classic application of the LEHLE P-ISO is the effective elimination of unwanted humming noises. 

Demo by  Custom Boards Finland

Demo by shnobel

Product Page

Review by The Gear Page

Review by gearnews

P-ISO

LEHLE D.LOOP SGOS als Herz der Pedalverwaltung empfiehlt sich dieser programmierbare 2-fach-Looper, um ausgeschaltete Effekte aus dem Signalweg zu nehmen. Die Loops sind unabhängig voneinander nutzbar. In jeder Situation steht zusätzlich ein regelbarer Buffer zur Verfügung, und da nicht alle Effektpedale einen Volume-Regler haben, können sie hiermit im Bedarfsfall sogar geboostet werden. Der High-End-Buffer-Boost hat Gainreserven bis zu 12dB und ist auch alleine nutzbar  solo!
Die Klinkenbuchsen und das interne Signalrouting sind komplett in stereo ausgeführt, um auch Studio- bzw. 19-Zoll-Geräte sowie Stereoeffektpedale in voller Qualität nutzen zu können. Gewährleistet wird dies durch die True-Bypass Eigenschaften der Lehle-Schalter mit goldkontaktierten Relais. Um Brummschleifen innerhalb der Effektloops zu vermeiden, wird auch die Signalmasse mitgeschaltet, eine Umschaltknackunterdrückung vermeidet störende Schaltgeräusche.
Die Programmierung ist denkbar einfach und intuitiv, sei es per Fernsteuerung über MIDI Program Change Commands, als Stand-alone-Gerät oder im Verbund mit weiteren SGoS-Switcher. Eine beliebte Kombination sind LEHLE D.LOOP SGOS und LEHLE DUAL SGOS, die sich gegenseitig kontrollieren und Effekte und Amps verwalten können. Die Verbindung erfordert lediglich ein simples Stereopatchkabel. So bleibt immer der gute Ton gewahrt!

The LEHLE D.LOOP SGOS recommended as the centerpiece of your pedal-board management system, a programmable double looper that takes inactive effects out of the signal path. The loops can be used independently of each other. An adjustable buffer is additionally available in every situation and - because not all effect pedals have a volume controller - can even be used to boost them when necessary. The high-end buffer boost has gain margins of up to 12dB and can also be used seperately!
The jack sockets and internal signal routing are entirely stereo, to permit full-quality use of studio, 19" and stereo effect-pedal units, too. This is assured by the True Bypass characteristics of the Lehle switchers and their gold-plated-contact relays. The signal ground is also switched, to eliminate hum in your effect loops, and a pop-and-click suppression circuit avoids annoying switching noise. 
Programming is as easy and as intuitive as you would expect from Lehle products, whether via remote, using MIDI program change commands, as a stand-alone unit, or combined with other SGoS switchers. One very popular combination is to use the LEHLE D.LOOP SGOS with the LEHLE DUAL SGOS - they can mutually monitor and control each other, and manage effects and amps. And a simple stereo patch cable is all you need to hit just the right tone!

Demo by Premier Guitar

Review by Brian Barr, premierguitar.com

Manual

Official Product Video

D Loop SGoS

The LITTLE LEHLE III allows you to remove effects pedals from your signal path at the press of a button.

Review by Thomas Dill

Thomann

Official manual

Little Lehle III

The LEHLE SUNDAY DRIVER is a high end preamp with a convenient compact format. It features JFET-based circuitry and provides two modes of operation, with selection via a mode selector switch with gold-plated contacts: "D" stands for Driver; in this mode, the 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 input impedance by four, bringing out previously inaudible details and, as gain increases, imparting to the guitar sound a characteristic and unmistakable warmth that has given this preamp its name - the result is a sound as mellow as a sunny Sunday afternoon!

Review by Musiker-Board

Demo by Musik Schmidt

Demo by Sheik Yerbouti

Sunday Driver v1

The LEHLE DUAL SGOS is the second evolutionary stage of the highly successful programmable switcher for two amps plus tuner. This unit makes it possible to play through two amplifiers individually or simultaneously, either as a stand-alone unit or in a network with other Lehle SGoS switchers. A particularly popular combination is the LEHLE DUAL SGOS with the LEHLE D.LOOP SGOS. Programming is as easy and intuitive as you would expect from a Lehle product, and can also be done remotely, using MIDI program change commands. Hum loops are completely excluded, thanks to electrical isolation of outputs A and B by the LEHLE TRANSFORMER HZ high-end transformer. Gold-plated-contact relays, ground switches and phase inverters assure the full, loss-free guitar sound. The potentiometers are in the signal path when output A and B are active simultaneously, and the volume of the two amps can be balanced - producing a third sound you've never heard before! Output T, basically intended for instrument tuners, can also be used for a third amp or for a second channel for amp B, opening up even more potentials. The gold-plated-contact relays feature active pop-and-click suppression, outputs A and B can be muted for undisturbed instrument tuning. Welcome to the new Duality!

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