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Фрагмент инструкции
It can be used to compensate for imbalance in room acoustics or input signals. Headphones socket The headphones socket accepts any dynamic headphones fitted with a standard 1/4 inch (6.35mm) stereo jack plug. If your headphones are fitted with a smaller jack (usually 3.5 mm), your dealer can supply a suitable adaptor. The headphones may mute the speakers, or not, as required (see Operating two pairs of speakers, page 2). This output is not suitable for driving most electrostatic headphones. Power The amplifier is turned on by pressing the mains power switch. The green light indicates that the power supply in the amplifier is operating - it will continute to glow for a short time after the amplifier has been switched off. A gentle ’click’ or ’pop’ may sometimes be heard shortly after turning the amplifier off. This is perfectly normal, and will not harm your speakers. Tape recording and replay The tape input/output is designed to suit most reel-to-reel and cassette tape recorders. Recording Select the signal source to be recorded using the selector switch (disc, tuner, CD or video). Then set the correct recording levels on your tape recorder and switch it into ’RECORD’ mode. During recording the volume and tone controls have no effect on the signal being sent to the tape ’out’ sockets. Replay Depress the tape monitor switch and then switch your tape recorder into ’PLAY’ mode. Connecting cables We strongly recommend the use of quality speaker and interconnect cables with your hi-fi system. The better the components used in your system, the more important it becomes to match them with good cable. We have found interconnect and speaker cables from the AudioQuest range to be particularly suitable. Detailed information on the AudioQuest range of cables may be obtained from your dealer or the factory. page 4 Hints and Tips Follow the manufacturer’s instructions on the placement of speakers for the best results. Generally, speakers should be mounted on dedicated stands, and sited away from corners. Always ensure that the speaker cable is connected securely to the output terminals, with no loose strands of wire, and that the mains connections are tight and fully home in their sockets. Keep the turntable away from the speakers to avoid acoustic pickup by the turntable from the speakers - they should not be placed on the same piece of furniture. The amplifier will get quite warm when being used at high levels. This is perfectly normal. However, if it becomes too hot to touch, switch off the amplifier at once and consult your dealer. If there is a lot of hum with the disc input selected, check that the earth lead from the turntable is connected to the ground terminal just above the disc input sockets, and that the amplifier is correctly earthed via the mains lead. Ensure that the amplifier is not directly underneath the turntable, or next to any unit containing a large mains transformer! (Check by moving the unit and assessing whether the hum level changes). If your system does not work check that: 1. The amplifier is switched on and the green LED is on. 2. The source is plugged into the correct input sockets. 3. The selector switch is switched to the correct source. 4. The speakers are connected to the amplifier correctly. 5. The tape monitor switch is not ’in’ when trying to use another input. 6. The volume control is not set to minimum. 7. The speaker fuses have not blown. 8. The fuse in the mains plug has not blown. If sound comes out of one speaker only check that: 1. Both speakers are connected to the amplifier correctly. 2. The balance control is not set fully clockwise or anticlockwise. 3. Both left and right channels of the source are connected to the inputs correctly and the input wiring is not faulty, (check by swapping left and right input connectors). 4. A speaker fuse has not blown. Arcam Alpha 3 handbook Technical specification Alpha 3 amplifier (Noise and sensitivities ref. 40W into 8 ohms at 1kHz.) OUTPUT POWER (typical) Both channels driven Into 8 ohms 40W. (20Hz-20kHz at 0.5%THD) Single channel driven at 1kHz Into 8 ohms 50W typical. Into 4 ohms 80W typical. Harmonic distortion At 30W, 8 ohms at 1kHz 0.02% typical. FREQUENCY RESPONSE Disc Input Typically +/- 0.5dB 60Hz - 20 kHz, -3dB at 20Hz. Other inputs Typically +/- 0.5 dB 10Hz - 20 kHz. Tone Controls Maximum variation +/-5 dB at 50Hz and 15 kHz. INPUTS Disc (suitable for MM and ’high-output’ MC cartridges.) Sensitivity 2.2mV, impedance 47k ohm/1 OOpF. Signal to noise ratio (CCIR) 75 dB. Overload margin 33 dB. page 5 CD, tuner, tape and video Sensitivity 170mV Signal to noise ratio (CCIR) 95dB Input impedance 20k ohm Overload margin 30dB. OUTPUTS Tape output Nominal output level 150mV, impedance 2k ohm Headphones Maximum output level into 600 ohms 10V rms. Output impedance 330 ohms. Suitable for heaphones of 8 ohms to 2k ohms impedance. Loudspeakers Nominal output level 40W per channel...
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