User manual TANDBERG TR-2075

[. . . ] Contents: Power ON/OFF switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Extra power sockets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Light dim. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FM Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] They provide a more intimate listening experience and difficulties associated with room acoustics are avoided. But there are disadvantages, for example the whole sound environment turns with the listener when he moves his head, a feeling regarded by some people as unnatural. Headphones today are mainly the moving-coil type and are obtainable with impedances ranging from about 8 ohms up to about 2000 ohms. The impedance of the headphone jacks is 220 ohms and they will accept any headphones with any impedance above 4 ohms. However, some caution may be necessary when playing at high volumes, because some types of headphones may be damaged by excessive power. The curve on the right shows how maximum obtainable power varies with the headphone impedance. Headphones come in all shapes, sizes, and weights and are largely a matter of personal preference. When buying headphones it is wise to try them on and be aware that the heavy, close fitting type may cause fatigue when used for long periods. Electrostatic headphones may be used on this receiver. They are thought by some people to give crisper sound. Remember to order headphones terminated in a 14" jack plug. Occasionally the plug should be given a quick rub with a soft cloth and a very small amount of vaseline. 12 Loudspeakers Connections Connect speakers to the terminals marked LOUDSPEAKERS at the back of the receiver. Use multi-stranded wire as thick as possible and make firm connections. The receiver will deliver optimum undistorted power when the resultant impedance of all the speakers connected to each stereo channel is between 4 and 8 ohms. Speakers or combinations of speakers with higher or lower impedances will give output powers below the optimum. For load impedances below 4 ohms the output power drops rapidly (see curve). The bottom figure shows some possible speaker combinations for one stereo channel. Each channel has 3 outputs in parallel, A, B, and C. But only 2 of the outputs (A+B or A+C) can be switched in at the same time. So when calculating the resultant impedance you must take this into account. Polarity Whichever combination of speakers is used it is important to observe the polarity when speakers are in the same room. In other words the cones must move forwards and backwards together. If the polarity is wrong, one cone will be moving forwards when the other is moving backwards and the result will be a reduction in bass volume. [. . . ] For tape test, depress the appropriate TAPE MON. For source test, release the same button. Adjust the sound level for the two tests so that when you switch from one test to the other the level wall be the same. WARNING!Depressing the PREAMP REC button reduces the amplification by 30 dB. [. . . ]