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Compact Stereo Amplifier
20 Watts RMS x 2 Channels
Model: SDA-40
www.pulse-audio.co.uk
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Safety Information
The lightning bolt
within a triangle is
intended to alert the
user to the presence
of un insulated
dangerous voltage
levels within the
product’s enclosure.
This voltage may be of
sufficient magnitude
to constitute an
electric shock risk.
To reduce the risk of electric
shock, do not remove cover
of this device. There are no
user serviceable parts
inside. Refer servicing only
to qualified service
personnel.
The exclamation point
within a triangle is
intended to alert the
user to important
operating and
maintenance
(servicing)
instructions in the
literature
accompanying the
appliance.
Safety Precautions
• Read and retain these instructions
• Follow all instructions and heed warnings
• Do not use this device near water
• If the surface becomes dirty, clean only with dry cloth, do not use solvents
or thinners
• Install in accordance with the manufacturer’s instructions
• Do not block ventilation openings
• Do not install near heat sources such as radiators, heat registers, stoves, or
other devices that produce heat
• Do not defeat the safety purpose of the grounded plug. This plug has two
blades and a third ground prong. The wide blade or third prong are provided
for your safety. If the provided plug does not fit into your outlet, consult an
electrician for replacement of the obsolete outlet
• Protect the power cord from being stressed at the plugs, convenience
receptacles, and where they exit the amplifier
• Only use accessories specified by the manufacturer
• Unplug the device during lightning storms or when unused for an extended
time
• Refer all servicing to qualified personnel
• This device must not be exposed to water in any way. No object filled with
liquids should be placed on apparatus
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Congratulations on your purchase of this
Pulse SDA Series Stereo Amplifier
This amplifier was designed specifically for use in permanent audio installations, where high
reliability and premium sound quality are a must. Highly rugged construction and high efficiency
design make this amplifier perfect for continuous duty applications in situations were power will be
left on for indefinite periods of time.
This amplifier is warranted from defects for one year from the date of purchase. Should your
amplifier require service, either within or beyond that warranty period, please contact your Pulse
Dealer or contact Pulse directly via info@pulse-audio.co.uk.
This unit includes a host of features, along with an impressive list of specifications, which are
detailed over the next pages. Please take the time to read this document completely prior to
installation of this product. Should you have questions regarding installation or operation of this
unit, please contact the Pulse Technical Support Department.
Features
• 20W RMS stereo amplifier, bridgeable to 40W RMS mono
• Highly efficient design (85%)
• Extreme compact size
• Rugged steel housing
• Independent L/R gain control
• Independent bass and treble control
• Switchable limiter
• RCA unbalanced line level inputs
• Detachable screw terminal balanced inputs, mic/line switchable
• Detachable screw terminal speaker outputs
• Attached brackets for easy wall mounting
Specifications
• Power Output:
Both channels 20W x 2 Channels driven at 4ohms
Mono bridge mode 40W x 1 Channel driven at 8ohms.
• Frequency Response: 50Hz ~ 18KHz
• Total Harmonic Distortion (THD): 0.05%
• Power requirements: 24VDC, AC adaptor supplied
• Dimensions: 56mm (H) x 230mm (W) x 115mm (D)
• Weight: 1kg.
Applications
• Installation behind flat panel monitors to power local speakers
• Kiosk and retail displays
• Powering additional zones on an existing distributed audio system
• Audio program material for digital signage installations
• Classroom installations, especially where video projectors are used
• Gaming & Vending machines
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Connections / Controls
1. DC Power Input – Supplied AC adaptor provides 24VDC, 3A with
100~240VAC, 50~60Hz input range.
2. Power ON/OFF Selector – Turns amplifier power on or off. When on,
the blue LED immediately to the right of this switch will illuminate.
3. Speaker Output Connection – Detachable Phoenix style connectors
may be removed from the amplifier for easy access. Screw type
terminals will accept up to 14AWG wire. Note the different labeling for
stereo or bridged mono connection. Also, as this is a floating output,
no speaker connections may be tied to chassis or earth ground.
4. Balanced Input Connection – Allows connection of line level or mic
level source to the input of the amplifier. Detachable Phoenix style
connectors may be removed from the amplifier for easy access and
accept up to 14AWG wire. While this connection is intended for
balanced use, unbalanced sources may also be used by strapping the
low signal (-) and chassis ground terminals together.
5. Unbalanced Input Connection – Accepts standard line level signal
from conventional consumer devices such as CD/DVD players,
television monitors, tape decks and tuners. Note that stereo operation
requires connection to left and right inputs. Each amplifier channel
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provides two line level input connections for convenience when using
as two independent mono amplifiers.
6. Mic / Line Selector – Determines whether screw terminal inputs
accept Mic level (5mV) or Line level (775mV) signal level. If you are
not sure of your devices signal level, first use Line level. If signal level
is very low, set the output volume to the lowest setting and select the
Mic position. Then slowly increase the Channel Level Controls.
7. Left / Right Channel Level Controls – Independent controls set
output level for the amplifier. When the amplifier is operating in
bridged mono mode, only the right control is used.
8. Bridged / Stereo Mode Selector – Allows the unit to operate as a
stereo amplifier, with two channels each capable of 20W RMS output,
or as a single mono amplifier channel, with 40W RMS output.
9. Limiter ON/OFF Selector – Engages or disengages the input signal
limiter circuit for amplifier output protection. In the ON position, the
amplifier will automatically limit high input signal levels, which will
prevent the amplifier from distorting, and reduce potential harm to
speakers. In the OFF position, the amplifier operates in normal mode.
It should be noted that overall dynamic range will be reduced when
the limiter is ON, thus being the tradeoff that occurs when this feature
is utilized.
10. Bass Control – This control adjusts low frequencies centered at
100Hz, at a rate of ±10dB.
11. Treble Control – This control adjusts high frequencies centered at
10,000Hz, at a rate of ±10dB.
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Compliance
When this product reaches the end of its life, do not dispose with household waste.
See www.recycle-more.co.uk for details of how to dispose of PULSE products in an
environmentally sound fashion, or contact PULSE directly via www.pulse-audio.co.uk
Pulse products are warranted, by Pulse, against manufacturer defects for a period of
one year from the original date of purchase. This warranty is limited to manufacturer
defects, in either materials or workmanship. Pulse, or any other worldwide divisions
of Premier Farnell PLC, are not responsible for any consequential or inconsequential
damage to any other component, structure or the cost of installation or removal of
said items.
This warranty will not cover damage due to improper use such as (and not limited
to) damaged cones, mounting frames, voice coils or items damaged by whether
damaged items.
For questions or specific information regarding warranty replacement or repair,
contact:
PULSE
www.pulse-audio.co.uk
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