Operating instructions

2
plifier is going to be housed in an enclosed envi-
ronment, that you allow for adequate ventilation.
Despite the adequately sized heatsinks built into
the amplifier, it is still important that good ventila-
tion be provided. Do not install the amplifier di-
rectly above another heat generating component
such as another amplifier without adequate venti-
lation.
2. If your amplifier is going to be placed in an en-
closed 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 proce-
dures 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 conve-
nience receptacles, and at the point where they exit
from the product.
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 con-
nected to this product.
3. Do not overload wall outlets, extension or inte-
gral convenience receptacles, as this could result
in a risk of fire or shock.
Operating Voltage
The LDS2/75 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 operat-
ing 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
not permit objects of any kind to be pushed and/or
fall into the product through the enclosure open-
ings.
General Description
The LDS2/75 is an intuitive product that has been
designed to provide amplification for up to two
pairs of 8 ohm speakers or one pair of 4 ohm speak-
ers.
The LDS2/75 outputs a total of 100 watts into 8
ohm loads and 150 watts into 4 ohm loads. 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 am-
plifier is connected to the speakers.
The LDS2/75 has an automatic internal sub-sonic
filter of -18dB per octave which rolls off very low
frequency content (below 20 Hz) to avoid low fre-
quency saturation of a transformer volume control.
The unit can be set for a bridged/mono application
in which case the output will be 150 watts into 8
ohm loads.
The 2/75 has a great many features all of which are
described in this manual.
Front Panel Description
The front panel has a blue LED will glow brightly
when the unit is active and will dim considerably
whenever the unit is in its ‘sleep’ mode.
The volume control knob allows you to set a pre-
ferred level.
Rear Panel Description
The following description identifies each of the
main controls/connection options and follows the
rear panel from left to right.
Input
The amplifier offers both speaker level and line
level inputs. A “balanced” input buffer is employed
in the speaker level input circuit that will accept
an output signal from either a ‘grounded’ or a ‘float-
ing’ music source.
Line Output (Buffered)
For use whenever a ‘daisy-chain’ installation and
multiple LDS2/75’s are used.
Mode Switch
This control allows for a selection of ‘Stereo’