Drawmer SP2120 User Manual

DRAWMER

SP2120

Speaker Protector

CONTENTS

Warranty
Safety Consideration

Chapter 1 - Introduction

Introduction
Installation
Tamper-proof Bracket
Audio Connections
Installation and Connection Guide - Stereo Pair
Installation and Connection Guide - Multiple Speakers

Chapter 2 - Control Description

Front Panel Controls
The Setup Procedure

Chapter 3 - General Information

If a fault develops
Contacting Drawmer
Specification
Block Diagram

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COPYRIGHT

This manual is copyrighted 8 2012 by Drawmer Electronics Ltd. With all rights reserved. Under copyright
laws, no part of this publication may be reproduced, transmitted, stored in a retrieval system or translated
into any language in any form by any means, mechanical, optical, electronic, recording, or otherwise, with­out the written permission of Drawmer Electronics Ltd.

ONE YEAR LIMITED WARRANTY

Drawmer Electronics Ltd., warrants the Drawmer SP2120
Speaker Protector to conform substantially to the specifications
of this manual for a period of one year from the original date of
purchase when used in accordance with the specifications
detailed in this manual. In the case of a valid warranty claim,
your sole and exclusive remedy and Drawmer’s entire liability
under any theory of liability will be to, at Drawmer’s discretion,
repair or replace the product without charge, or, if not possible,
to refund the purchase price to you. This warranty is not
transferable. It applies only to the original purchaser of the
product.

SAFETY CONSIDERATIONS

DRAWMER

SP2120

SPEAKER PROTECTOR

CAUTION - MAINS FUSE

For warranty service please call your local Drawmer dealer.
Alternatively call Drawmer Electronics Ltd. at +44 (0)1709

527574. Then ship the defective product, with transportation
and insurance charges pre-paid, to Drawmer Electronics Ltd.,
Coleman Street, Parkgate, Rotherham, S62 6EL UK. Write the
RA number in large letters in a prominent position on the
shipping box. Enclose your name, address, telephone number,
copy of the original sales invoice and a detailed description of
the problem. Drawmer will not accept responsibility for loss or
damage during transit.

This warranty is void if the product has been damaged by
misuse, modification or unauthorised repair.

THIS WARRANTY IS IN LIEU OF ALL WARRANTIES,
WHETHER ORAL OR WRITTEN, EXPRESSED, IMPLIED OR
STATUTORY. DRAWMER MAKES NO OTHER WARRANTY
EITHER EXPRESS OR IMPLIED, INCLUDING, WITHOUT
LIMITATION, ANY IMPLIED WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
OR NON-INFRINGEMENT. PURCHASER’S SOLE AND
EXCLUSIVE REMEDY UNDER THIS WARRANTY SHALL BE
REPAIR OR REPLACEMENT AS SPECIFIED HEREIN.

IN NO EVENT WILL DRAWMER ELECTRONICS LTD. BE
LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL
OR CONSEQUENTIAL DAMAGES RESULTING FROM ANY
DEFECT IN THE PRODUCT, INCLUDING LOST PROFITS,
DAMAGE TO PROPERTY, AND, TO THE EXTENT PERMITTED
BY LAW, DAMAGE FOR PERSONAL INJURY, EVEN IF
DRAWMER HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.

TO REDUCE THE RISK OF FIRE

REPLACE THE MAINS FUSE ONLY WITH

A FUSE THAT CONFORMS TO IEC127-2.

250 VOLT WORKING, TIME DELAY TYPE

AND BODY SIZE OF 20mm x 5mm.

THE MAINS INPUT FUSE MUST BE

RATED AT 230V=T50mA and 115V=T100mA.

CAUTION - MAINS CABLE

DO NOT ATTEMPT TO CHANGE

OR TAMPER WITH THE

SUPPLIED MAINS CABLE.

CAUTION - SERVICING

DO NOT PERFORM ANY SERVICING.

REFER ALL SERVICING TO QUALIFIED

SERVICE PERSONNEL.

WARNING

TO REDUCE THE RISK OF FIRE OR

ELECTRIC SHOCK DO NOT EXPOSE

THIS EQUIPMENT TO RAIN OR MOISTURE.

Some states and specific countries do not allow the exclusion
of implied warranties or limitations on how long an implied
warranty may last, so the above limitations may not apply to
you. This warranty gives you specific legal rights. You may
have additional rights that vary from state to state, and country
to country.

It is the responsibility of the installer to ensure that the continuous power rating of the speakers is not exceeded, as
Drawmer Electronics Ltd will not accept any responsibility for damage caused by incorrect installation and settings.

In the interests of product development, Drawmer reserve the right to modify or

improve specifications of this product at any time, without prior notice.

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DRAWMER

SP2120

SPEAKER PROTECTOR

INTRODUCTION

CHAPTER 1

The Drawmer SP2120 Speaker Protector offers both strict
level control and tremendous peace of mind to the con­tractor, installer and venue in the knowledge that, as its
name suggests, the 1U, two channel processor eliminates
the possibility of ’unauthorised’ excessive sound pressure
levels on speaker systems (as caused by spikes and pops
in the system, or by over-enthusiast dj’s/engineers) which

The key features are as follows:

• Key Holder access only

• Takes only minutes to install

• Tamper-Proof bracket (available separately) to lock-in the XLR’s and conform to Local Authority regulations.

• Dual 16 segment Left/Right bargraphs for ’at a glance’ level metering

• ’Protection’ processing 16 segment bargraph display

• No sound quality loss even during heavy protection processing

• Once installed and calibrated completely eliminates the possibility of ’unauthorised’ volume levels

• Eliminates sound system abuse and the resulting cost of chassis speaker re-cones, HF diaphragm
replacements and amplifier repairs.

• Reduces ’call-out’ costs of sound system service/repair engineers

• Reduces sound system ’down time’ and the consequential loss of venue income

• Isolation transformer output option.

could result in damage to both chassis drivers and ampli­fier electronics. In addition only the maintenance engi­neer and the venue manager hold a key. The unit also
gives a wide variety of venues, such as clubs, theatres,
pubs, schools, universities etc. the opportunity to comply
with the local legislation regarding noise levels.

The SP2120 front panel features an integral security lock
to ensure that adjustments to maximum volume levels are
implemented by key holders only. In ’unlocked’ mode two
front panel pre-sets are exposed and available for
adjustment by the installer. The first calibrates the 16
segment Left/Right bargraphs to the incoming audio and
dictates the point at which ’protection’ processing
commences. The second sets the absolute volume level
to which the sound system is allowed to perform. If the
SP2120 receives increased signal levels, the transparent
’protection’ circuitry is activated which maintains the
specified system volume level without degradation in sound
quality.

The SP2120 greatly benefits from Drawmer’s 25 years
experience in designing industry standard dynamic
processing devices. Its signal path combines a mixture of
’multiple time constant’ circuitry and automatic gain control
(AGC) which allow small overloads to sound louder – even
though they’re not.

Its concept and development was encouraged by Drawmer
distributors and installers dissatisfied with other protection
systems currently available. These often take the form of
a crude switch, either turning off the power or disconnecting
the speakers, both of which are ’disruptive’ in any event.

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