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.
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.
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.
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.
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.
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
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.
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).
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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’.
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.
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.
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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