Brochure

• Key Holder access only • Takes only minutes to install
• 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
• Reduces 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
The new Drawmer SP2120 Speaker Protector offers both strict level control and
tremendous peace of mind to the contractor, installer and venue in the knowledge that only
the maintenance engineer and the venue manager hold a key. As its name suggests the
1U, two channel processor eliminates the possibility of ‘unauthorised’ excessive sound
pressure levels on speaker systems which could result in damage to both chassis drivers
and amplifier electronics. 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.
Crosstalk >90dB at 20kHz
Noise -99dB (Unity gain ref +4dBu/22Hz-22kHz)
Isolation Transformer option for Output stage.
Drawmer • Charlotte Street Business Centre • Wakefield • West Yorkshire WF1 1UH • England
Tel: [phone] • Fax: [phone] • Email: [e-mail] • Web: www.drawmer.com
CONNECTORS
Balanced XLR in/out. Pin 1 screen (earth), Pin 2 + (positive), Pin 3 - (negative)
INPUT
Input Impedance 30K Ohms
Max Input Level +27dBu
CMR >40dB (22Hz-22kHz)
OUTPUT
Output Impedance 100 Ohms
Output Level Variable. Infinity to +14dBu
Balance >40dB (22Hz-22kHz)
Specification (subject to change without notice)
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 a direct result of market feedback from 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.
The SP2120 is intended to be inserted in the sound system immediately prior to the
amplifier stage.
© Copyright 2003 Drawmer Ltd.