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User manual Adcom, model Multichannel Power Amplifier

Manafacture: Adcom
File size: 604.73 kb
File name: 25f71df3-4d52-4854-8aac-86cf40734103.pdf

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This allows the amplifier’s power supply to discharge fully before it is switched on again. Bi-wiring and bi-amping loudspeakers BEFORE YOU START WARNING: Do not make any connections to your amplifier while it is switched on or connected to the mains supply. Before switching on please check all connections thoroughly, making sure bare wires or cables are not touching the amplifier in the wrong places (which could cause short circuits) and you have connected positive (+) to positive and negative (–) to negative. Always ensure that the volume control on your amplifier is set to minimum before starting these procedures. BI-WIRING YOUR LOUDSPEAKERS Bi-wiring improves the sound of your system because it divides the high and low frequency signal currents into separate speaker cables. This avoids signal distortions arising from the high and low frequency currents interacting with one another within a single cable, as in conventionally wired systems. You will need: Speakers – with four input terminals each: these will be marked HF (High Frequency + and –) and LF (Low Frequency + and –). Loudspeaker cables – two pairs of cables per loudspeaker (which may be joined at the amplifier end if your amplifier has only one pair of output terminals per channel, as is the case with P7), or a suitably terminated cable set. How to bi-wire loudspeakers 1. Remove the terminal links on the rear of your loudspeakers. NOTE: If you do not remove the shorting links from the speaker terminals, the speakers will still be single-wired! 2. Connect the cables as shown in the diagram below, ensuring correct polarity at all times. BI-AMPING YOUR SYSTEM The performance of your system can be further enhanced over that achieved with bi-wiring, by extending the principle one stage further to include separate amplification for the low and high frequency drive units in each loudspeaker enclosure. To bi-amplify your speakers, connect the speaker terminals from one module to one pair of terminals on the speaker. Connect another module, or one channel of a separate power amp, to the other pair of terminals on the speaker, so that two amplifier channels are connected to that speaker; one for low frequencies and one for high frequencies. Ensure that in all cases, the positive terminals on the speakers are connected to the positive (red) terminals on the amplifier, and similarly for the negative (black) terminals. NOTE: In order to bi-amplify your speakers, your speakers will need to be bi-wirable, and have positive and negative terminals for both high frequency (HF) and low frequency (LF) information. If your speakers are bi-wirable, ensure that the links between the HF and LF terminals are removed. How to set up a bi-amped system 1. Remove the terminal links on the rear of your loudspeakers. WARNING: This step is essential or damage to your amplifier may result which is not covered under warranty. 2. Connect the cables as shown in the diagram below, ensuring correct polarity at all times. 3. Use interconnect cables to connect the OUT socket of the first channel to the corresponding IN socket of the adjacent channel of the power amplifier. Arcam P7 power amplifierHFLF+ +– – + – INOUT Arcam P7 power amplifierHFLF+ +– – + – INOUT+ – INOUT Recommended bi-amping configuration Bi-wiring using one set of connections on amplifier Troubleshooting NO LIGHTS ON THE UNIT Check that: . the power cord is plugged into the P7 and the mains socket outlet it is plugged into is switched on. . the plug fuse has not failed, or a circuit-breaker earlier in the power supply path has not opened. . the power button is pressed in. RED LED PRESENT Refer to the ‘Fault Status Indicators’ table if you have an unusual sequence of LEDs. NO SOUND IS PRODUCED Check that: . the correct input has been selected on the pre-amp. . you have assigned the digital input to the correct input source. . the volume is turned up to a reasonable level and ‘MUTE’ is not displayed on the front panel display on the pre-amp. . your power amplifier(s) are turned on and working correctly. SOUND IS POOR AND BADLY DISTORTED Check that: . all cables are making a good connection. If necessary withdraw the cable from the connector and plug it back in again. (Turn the power off before doing this.) . you have selected the correct size of speakers to suit your system in the setup menu of the processor or pre-amp. SOUND ONLY COMES FROM SOME OF THE SPEAKERS Check that: . all speakers in the system are connected to the P7. . you have configured your pre-amp to include all the speakers in your system. . you have an appropriate surround sound source selected and playing through the pre-amp. . for digital sources, check the player is outputting multichannel data. With some DVD players you are able to select in what format multi-format encoded discs are outputted, and whether multichannel data is down mixed to PCM (stereo). . the disc you are playing is a multichannel recording and that the processor is outputting multi...