User manual VINCENT SP331

[. . . ] Dear Customer, we thank you for the confidence you prove in purchasing our product. It will match your high demands towards sound and manufacturing quality. Though it is understandable that you want to plug and play this product instantaneously, we encourage you to read this manual carefully before installation. It will help you in handling and operating this machine in your system and obtaining the best possible performance, even if it was installed by your dealer. [. . . ] SPEAKERS: Loudspeaker terminals At these output sockets with threaded terminals one or two pairs of loudspeakers can be connected. Please take note of the information given in the section "Installation", if two pairs of loudspeakers will be connected to the amplifier. INPUT: Input for preamplified mono audio signal This input must be connected with the output connectors of the preamplifier for the desired channels. For example, with "PRE OUT R"/ "PRE OUT L", if the SP331 is to be used for the loudspeakers of a stereo system. AC 220-240V: Power Connector To establish the power supply, connect the plugs of the power cable to the device and to a suitable wall outlet. Connect the power cable between device and power supply only after all other connections have been made. DURING INSTALLATION PLEASE OBSERVE THE FOLLOWING ADVICE: Protective caps Prior to the first installation the protective plastic caps must be removed from all the connections used at the rear of the unit. Make sure that bare loudspeaker wires are never able to come into contact with each other or with the metal on the back of the housing. Make sure that the positive and negative loudspeaker wires are connected correctly. You will notice a reduced sound quality if the connections are the wrong way round. Only use loudspeakers with a nominal impedance of at least 8 if more than two speakers will be connected. Inadequate connections can cause noise interference, failures and malfunctions. RCA connections Contacting the middle pin of the RCA plugs with the outer ring of the RCA chassis jack may lead to damages to the main amplifier if it is switched on!To avoid this hazard, connect or disconnect only in switched-off state and more than one minute after deactivating!Make sure that you do not mix up the analogue inputs for right and left. The RCA plugs for these are mostly colour coded as follows: red for the right channel, black or white for the left channel. Loudspeaker Connections The use of ready-made loudspeaker cables is recommended instead of connecting the cable's central wire (strand) directly to the terminals. To make the most of the components' sound potential, only high quality loudspeakers and connecting cables, for example Vincent cables, should be used. This main amplifier is equipped with a stereo audio input ("INPUT") on which the unit awaits the preamplified signal of two audio channels. This is the audio information that the SP-331 provides for one or two pairs of loudspeakers. Attention: No source with a standard line level signal ("LINE OUT") must be connected to this input. This audio input must be connected to the output connectors ("OUTPUT") of a preamplifier. [. . . ] By doing this the housing is able to shield all signals from external radiated noise. Some main amplifiers are equipped with a "Ground Lift" switch. If it is activated, ground potential of the chassis and the protective ground wire are being separated from the central signal ground point. If the problem occurs and cannot be solved by yourself your audio specialist dealer will help you. [. . . ]