Sherbourn Technologies LDS-2.150 Owners manual
5. Adhere to all warnings and follow all operating
instructions.
6. Warning: To reduce the risk of fire or electrical shock, do not expose this equipment to rain
or moisture.
There are no user serviceable parts inside. Refer
servicing to qualified personnel.
7. Caution: To prevent electrical shock do not use
this (polarized) plug with an extension cord, receptacle or other outlet unless the blades can be
fully inserted to prevent blade exposure.
Model LDS2/150
Owner’s Manual
Thank you so much for your decision to purchase
one of our superb Sherbourn amplifiers. We take
enormous pride in the design and build quality of
all of our products and we are confident that our
product will provide you with many years of enjoyable and trouble-free service. Should you have
any need to call upon our services please feel free
to contact us at the address shown at the end of
this booklet; or, of course, you can contact the dealership from which you purchased the product.
Full details of the warranty coverage provided by
Sherbourn Technologies can be found at the end of
this booklet.
Safety Instructions
1. Important Safety Instructions! Please read
all the safety and operating instructions shown
in this manual before operating this equipment.
8. For added protection for this product during a
lightening storm or when it is left unattended and
unused for long periods of time, it is recommended
that you unplug the unit from the wall outlet. This
will prevent damage to the product due to lightening or power line surges.
9. Do not use attachments not recommended in this
owner’s manual as they may cause hazards.
10. Locate the equipment for proper ventilation.
For example, the product should never be allowed
to operate while positioned on a bed, rug, sofa or
any such surface where proper ventilation is not
possible. Nor should the unit be placed in a built-in
installation such as a cabinet or armoire, etc. in such
a way as to impede the air flow. Always ensure
adequate ventilation openings - please see later comments regarding such an installation.
11. Locate the product away from heat sources such
as stoves, heat registers, radiators or other appliances including other amplifiers that produce heat.
12. Mount the equipment in a wall or cabinet only
as described in this owner’s manual.
2. The lightening flash within an equilateral triangle
shown above is intended to alert you to the presence of uninsulated ‘dangerous voltage’ within the
product’s enclosure that may be of sufficient magnitude to constitute an electric shock.
3. The exclamation point within an equilateral triangle shown above is intended to alert you to the
presence of important operating and maintenance
(servicing) instructions in the literature accompanying this appliance.
4. Please retain this manual in a safe place for future reference about safety and operating matters.
13. Do not use the equipment near water; for example near a bathtub, washbowl, kitchen sink, a
wet basement, swimming pool, etc. This product
is meant for indoor use only.
14. Do not place the product on an unstable cart,
stand tripod, bracket or table. The equipment is
heavy and should it fall, it could cause serious injury to a person and/or serious damage to the equipment.
Caution For Installation
1. Your Sherbourn amplifier can be placed on any
table or shelf. It can also be custom installed in a
rack, and/or in a piece of cabinetry or furniture of
your choice. It is however, important that if the
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amplifier is going to be housed in an enclosed environment, that you allow for adequate ventilation.
Despite the adequately sized heatsinks built into the
amplifier, it is still important that good ventilation
be provided. Do not install the amplifier directly
above another heat generating component such as
another amplifier without adequate ventilation.
2. If your amplifier is going to be placed in an enclosed space such as an armoire, it is essential that
adequate ventilation be provided.
3. The dealership from which you purchased the
product is an expert on custom installation procedures and can provide invaluable advice to help you
make an aesthetically pleasing and trouble free installation.
Caution For Connections
1. Connect this equipment only to the type of AC
power source as marked on the unit. Always route
AC power cords so they are not likely to be walked
on, or tripped over, or where they may be pinched
by items placed on or against them. Always pay
particular attention to cords at plugs and/or convenience receptacles, and at the point where they exit
from the product.
not permit objects of any kind to be pushed and/or
fall into the product through the enclosure openings.
General Description
The 2/150 is an intuitive product that has been designed primarily to facilitate seamless switching
between a television and an installed music system.
Since it is assumed that an audio system is already
in place, the 2/150 has designated that this will be
the primary system and so it is referred to as “A”
and the interrupter part of the 2/150 is referred to
as ‘B’.
The 2/150 outputs a total of 2 x 50 watts into an 8
ohm load and 2 x 75 watts into a 4 ohm load. The
amplifier will drive two pairs of 8 ohm speakers or
one pair of 4 ohm speakers. An embedded MPU
(Micro Processing Unit) ensures that the amplifier
cannot be ’overdriven’, and the LDS (Load Detection System) ensures that all speaker connections
must be good before the amplifier is connected to
the speakers.
The 2/150 has an automatic internal sub-sonic filter of -18dB per octave which rolls off very low
frequency content (below 20 Hz) to avoid low frequency saturation of a transformer volume control.
2. Do not defeat the inherent design features of the
polarized plug. Non-polarized line cord adapters
will defeat the safety provided by the polarized AC
plug. If the plug should fail to fit, contact your
electrician to replace your obsolete outlet. Do not
defeat the safety purpose of the grounding-type
plug. If you use this product in a country which
only has two slotted receptacles in the house, you
must use a three-pin adapter plug to earth ground
which is the “E” (earth pin) of the power cord connected to this product.
3. Do not overload wall outlets, extension or integral convenience receptacles, as this could result in
a risk of fire or shock.
Operating Voltage
The LDS2/150 amplifier is factory-set for 110V,
120V or 230V AC operation at either 50 or 60 Hz,
according to the country for which the unit was
manufactured (230V in European Union countries,
in compliance with CE regulations). The operating voltage cannot be changed by the user and any
attempt to do so will void the warranty.
Care of the Product
Clean the product by dusting with a dry cloth. Do
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The unit can be set for a bridged/mono application
in which case the output will be 130 watts.
The 2/150 has a great many features all of which
are described in this manual.
Front Panel Description
The front panel has a number of important controls
with which you should familiarize yourself.
The blue LED will glow brightly when the unit is
active and will dim considerably whenever the unit
is in its ‘sleep’ mode.
B Off Delay
Controls the priority ‘zone’ and enables you to set
the delay time for the ‘B’ zone from 0.3 minutes to
a maximum of 5 minutes. You need to set the front
input selector to either ‘B’ or ‘Auto’ in order to
use the ‘B Off Delay’.
B On Level
Control allows you to set the sensitivity of the autoturn on circuit to be triggered by the ‘B’ input. The
range of this adjustment is from -86 dB below rated
output (indicated as ‘LO’ on the front panel) to 72 dB below rated output (indicated as ‘HI’ on the
front panel).
Input A/B/Auto
Switch allows you to select either ‘A’ input only
(always play signal from ‘A’ input), or ‘B’ input
only (always play signal from ‘B’ input) or Auto
which allows that whenever there is an input signal
present at ‘B’ input it will override ‘A’.
Line Output (Buffered)
For use whenever a ‘daisy-chain’ installation and
multiple 2/150’s are used. ‘Line Output’ outputs
the signal from ‘A’ input if the 2/150 is playing the
‘A’ input, or outputs the signal from ‘B’ input when
the 2/150 is playing ‘B’ input.
Volume
Control allows you set a preferred level on both
‘A’ and ‘B’.
Rear Panel Description
The following description identifies each of the main
controls/connection options and follows the rear
panel from left to right.
Input A
Offers both speaker level and line level inputs for
the non-priority zone. These inputs are paralleled
inputs to the 2/150 and only one input can be used
at a time. A ‘balanced’ input buffer is incorporated
in the speaker level input circuit; it will accept an
output signal from either a ‘grounded’ or ‘floating’
music source.
Input B
This is the ‘priority’ zone and it is to these inputs
that you would normally connect the product over
which you seek to maintain control from the external amplifier. Similarly to input ‘A’, both ‘B’ inputs are paralleled inputs to the 2/150 amplifier,
and again, only one input can be used at a time. A
‘balanced’ input buffer is also employed in the
speaker level input circuit; it will accept an output
signal from either a ‘grounded’ or a ‘floating’ music source.
Input B Triggers
These controls give you multiple options for your
priority system and are used in connection with
INPUT B inputs.
Video In Jack
Works only with the ’B’ input. To use this trigger
input, first set the trigger input selector to 12V/
Video position. The 2/150 will turn on exclusively
when it sees a video signal present at this video
input jack.
Music
Works only with the ‘B’ inputs. With the 2/150’s
‘B’ trigger switch in the ‘music’ position, it will
automatically function once it receives a music signal and will move into its standby mode whenever
the signal is absent for a period exceeding the delay
time set by the ‘B Off Delay’ control on the front
panel.
12V / Video
Works only with the ‘B’ inputs. With the 2/150’s
‘B’ trigger switch in the ‘12V/Video’ position, the
2/150 can be turned on from a ‘sleep’ state whenever a 6V to 15V input signal appears at the 12V
input connector or a video signal at the ‘Video Input’ jack . 12V trigger and video trigger inputs are
connected in parallel, only one of the inputs should
Fig. 1. Front panel view
Fig. 2. Rear panel view
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