User manual ARCAM FMJ A38

[. . . ] A38/P38 Handbook Integrated and power amplifiers english CAUTION ATTENTION RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR class i product This equipment is a Class I electrical appliance. It requires safety connection to electrical earth (`ground' in the U. S. ). safety guidelines RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION: To reduce the risk of electric shock, do not remove cover (or back). WARNING: To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture. The lightning flash with an arrowhead symbol within an equilateral triangle, is intended to alert the user to the presence of uninsulated `dangerous voltage' within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. [. . . ] The diagram below shows the wiring scheme, which will also apply to other IR pick-up devices commonly available. rEMotE In Tip = Signal Sleeve = 0V Dinky Link, located in Zone 2 Signal The A38 can also provide a +12V trigger output to control devices such as the power amplifier in Zone 2. The +12V trigger is active when the unit is `On'. e-7 english To use your A38 as a dedicated pre-amplifier, or as part of a bi-amp'ed system, connect the PrE out sockets to the input sockets of your power amplifier. connecting loudspeakers to the A38/P38 loudspeakers Single wiring Single wiring is the conventional wiring method of running a single cable per channel between the amplifier and the speaker; this is the easiest technique. notes on making speaker connections < Do not make any connections to any amplifier while it is switched on. We recommend that your amplifier is completely disconnected from the mains supply before starting. Before switching your amplifier(s) on for the first time after connecting to speakers, please check all connections thoroughly. Ensure that bare wires or cables are not touching each other or the amplifier's chassis (which could cause short circuits), and that you have connected positive (+) to positive and negative (­) to negative. After making connections: switch the amplifier(s) on, select a source signal, then gradually increase the volume to the required listening level. If you are unsure as to how your system should be connected, or need advice on bi-wiring or bi-amping, please contact your Arcam dealer who will be happy to help you. bi-wiring Bi-wiring is running two separate cables between the amplifier and each speaker, with one cable carrying the low-frequency information, the other the higherfrequency signals. Bi-wiring can improve the sound of your system because the separation of high- and low-frequency signal currents into different speaker cables avoids distortions caused by the different currents interacting with oneanother within a single cable, as occurs in single-wired systems. The A38 and P38 are designed to allow easy bi-wiring, but you will need to connect to loudspeakers that provide separate terminals for the two cables. Each speaker must have two pairs of terminals; one pair labelled hf or `High Frequency', the other pair labelled Lf or `Low Frequency' . < < < bi-amping Bi-amping is the separation of the amplification of lowand high-frequency signals over two amplifiers. Normally, your A38 is used to drive the highfrequency (treble) speakers, with the P38 used for the lower (bass) frequencies. e-8 Single wiring english Both the A38 and P38 are designed for bi-wiring, which is why there are duplicate speaker terminals on the back. For single wiring, we recommend that you use the lower set of speaker terminals on your amplifier. If each speaker has more than one pair of connecting terminals, use the terminals labelled Lf or `Low Frequency' for each speaker. Connect the positive terminal of the right speaker connection on the amplifier (coloured red and labelled +r) to the positive terminal of your right speaker. Similarly, connect the negative terminal of the amplifier (coloured black and labelled with r­) to the negative terminal of your speaker. Repeat the process for the left speaker, using the amplifier terminals labelled +L and L­. If your speakers support bi-wiring, then there is a strip of conductive metal on the speakers connecting the low-frequency terminals to those for the higher-frequencies; this mUST NOT bE REmOVED in a single-wired system. An A38 or P38 connected to speakers using single wiring bi-wiring Bi-wiring is performed in the same way as single wiring except that, for each speaker, a pair of cables are used to connect the amplifier to each speaker. Follow the instructions given for single wiring; then perform the same actions, this time connecting the upper set of speaker terminals on your amplifier to the terminals labelled hf or `High Frequency' for each speaker. Speakers that support bi-wiring have a strip of metal on the speakers connecting the lowfrequency terminals to those for the higher-frequencies; this mUST bE REmOVED in a bi-wired system. An A38 or P38 connected to speakers using biwiring bi-amping Bi-amping requires the use of two amplifiers per channel. Normally, your A38 is used to drive the high-frequency (treble) speakers, while a power-amplifier (such as a P38) is used for the lower (bass) frequencies. Connect your A38 to the speakers as described for single wiring, with the exception that the A38 should be connected to the speaker terminals labelled hf or `High Frequency'. Then connect the power amplifier (P38, for example) to the Lf or `Low Frequency' terminals, as in the diagram. [. . . ] Repeat steps 1 and 2 on your second P38, but this time connect the LEft channel from your pre-amp (or PrE out L from an A38) to the socket labelled AudIo In L. Follow the diagram (left) for bi-wiring each speaker, using the sP2 connections of the P38 for the high-frequency speaker and the sP1 connections for the low-frequencies in each case. Using a pair of P38s with the Mono Link to biamplify a pair of speakers e-14 Remote switching By making a connection from the trIG out socket of the A38 Integrated Amplifier to the rEMotE In socket of your P38, you can use the A38 to switch the power amplifier on and off. If configured in this way, the front panel PowEr button of the A38 (or the 2 button on the remote control) switches both amplifiers on and off together. This facility allows you to position your power amplifier in a remote location (such as close to the speaker it is amplifying), yet still control it. [. . . ]