Sherbourn technologies lds 2 150 owners manual
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2 amplifier 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 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 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 in- stallation. 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 LDS2/150 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 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. Donot permit objects of any kind to be pushed and/or fall into the product through the enclosure open- ings. General Description The 2/150 is an intuitive product that has been de- signed 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 Detec- tion 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 fil- ter 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 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 auto- turn 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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3 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 exter- nal amplifier. Similarly to input A, both B in- puts 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 mu- sic source.Line Output (Buffered) For use whenever a daisy-chain installation and multiple 2/150s 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 2/150s B trigger switch in the music position, it will automatically function once it receives a music sig- nal 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 2/150s B trigger switch in the 12V/Video position, the 2/150 can be turned on from a sleep state when- ever a 6V to 15V input signal appears at the 12V input connector or a video signal at the Video In- put jack . 12V trigger and video trigger inputs are connected in parallel, only one of the inputs should Fig. 2. Rear panel viewFig. 1. Front panel view