Lehle Basswitch Clean Boost User Manual

Ruppert Musical Instruments

CLEAN BOOST

User Manual

Ruppert Musical Instruments • 20a, rue de Bascharage • L - 4995 Schouweiler • Luxembourg

Tel./Fax: [phone] • Web: www.rmi.lu • E-Mail: [e-mail]

Introduction

Why a specific Booster for bass instruments? The reasons are obvious: the
frequency range of bass instruments goes from very deep fundamentals
(e.g. 30.87 Hz for low B or 41.20 Hz for low E on an electric bass) to very
high overtones that have a crucial impact on the timbre of the bass instru­ment even though they are approaching the upper limits of the audible
spectrum (from 18 Hz to 20 kHz). On top of this, bass instruments have a
characteristic attack with a very steep initial transient followed by a weak
electrical signal.

These characteristics of bass signals make enormous demands on the
electronics, with the result that the handling of bass signals by most
equipment is unsatisfactory and inconsistent in quality. Only equipment
specifically designed for the purpose is able to handle such a demanding
signal pattern adequately.

Functions and applications overview

- The Basswitch Clean Boost used as a booster

The primary application field of the Basswitch is the one as booster with
an adjustable EQ. Used as such the Basswitch Clean Boost puts at your
disposal a louder tone and/or a second sound setting for your instrument
at the push of a footswitch.

Note: The Gain control has a volume cut and boost function to allow
a perfect match of the desired tone levels.

- The Basswitch Clean Boost as a high-end preamp

The Basswitch Clean Boost features a high-end preamp and a 3-band
EQ specifically designed for bass instruments and featuring bass, mids,
and treble controls. As a stand-alone preamp, the Basswitch Clean Boost

can drive a power amp, an active monitor, an active bass speaker cabinet
or an in-ear monitoring system.

Additional features

- Lehle “True Sound Technology” (for details please consult the chapter
“Tech Talk”).

- Specially designed to protect the controls from damage and to prevent
inadvertent changes to the settings.

- The design of the housing permits easy installation: the ultra-flat base
and removable rubber feet allow the unit to be securely attached to the
pedal-board using Velcro or similar.

Description

1. Input IN

Connect your instrument here.

This is the standard input for all instruments. The input is designed to
accept active and passive instruments.

2. Output OUT

Connect your bass amp or power amplifier or active monitor here.

If the Basswitch Clean Boost is used in its function as booster upstream
of a bass amp, it should be in “straight through” mode (LED lights white)
when the settings for the basic sound are made on the amplifier. Only af­ter that the tone for solos, a second sound or a second instrument should
be set on the Basswitch Clean Boost.
If the Basswitch Clean Boost is used as a preamp upstream of a power
amp to drive a power amp, an active monitor, an active bass speaker

Congratulations!

With the Basswitch Clean Boost you have purchased an all-purpose, su­per compact high-end bass preamp that gives you the confidence to be
adequately prepared for any situation, be it in a live performance or in a
recording studio.

When developing the Basswitch Clean Boost we focused on the needs and
wishes of the professional bass player who is not willing to compromise
on either sound or the technical quality of the equipment. The Basswitch
Clean Boost is manufactured, assembled and tested in Germany to the
highest quality standards using only the best brand components available
to ensure optimal treatment of the electrical signal from your instrument.

Please take your time to read this user manual carefully before you start
using your Basswitch Clean Boost. You will find lots of useful information

on the pedal and the various ways it can be used. Keep this user manual
carefully so that you can consult it at any time.

Your Basswitch Clean Boost package contains the following items:

- Basswitch Clean Boost

- User manual

Please check that all these items are there as soon as you unpack. Should
something be missing, please contact your authorized dealer.

The Basswitch Clean Boost is built to last, but if you nonetheless experi­ence problems or have any questions do not hesitate to contact us.

I wish you every success with your Basswitch Clean Boost.

Yours, Jacques Ruppert

Summary

Introduction 2
Description 2
Tech Talk 3
Technical data 4

2