Low Cost AM FM Stereo Receiver
MCS 3245 Owners Manual
To obtain faithful reproduction of sound, it is very important that the left and right speakers are operating in phase. In phase means that at any given moment the cones of both speakers are moving in the same direction. If the cones of the two speakers are moving in opposite directions (out of phase), bass response and sound quality are altered. To insure proper speaker phasing, connect the positive (+) RECEIVER terminal to the positive (+) SPEAKER terminal, and the negative (—) RECEIVER terminal to the negative (—) SPEAKER terminal. ..
300 ohm antenna leadins-Model 3245 comes with a 300 ohm wire dipole whose leadins should be connected to the 300 ohm FM antenna terminals. If stronger signal reception is desired it is recommended that an outdoor directional antenna and rotor system be installed. Use 300 ohm shielded antenna leadin between your outdoor antenna and receiver. Always install a lightning arrestor on every exterior Mounted antenna. Your JCPenney audio salesman will help you choose the right type of antenna system for your particular need and geographic location. (See Figures 4 and 5).
75 ohm antenna leadins-For the highest quality FM reception, 75 ohm antenna terminals are provided. This allows you to install 75 ohm shielded antenna cable to your outdoor FM antenna. Use of 75 ohm cable helps reduce multipath, high voltage RF and auto ignition interference. Use it when the outdoor antenna and receiver are far apart.An efficient 300 ohm dipole antenna is supplied with your unit. Connect the antenna leadins to the FM terminals and extend the arms of the antenna. Rotate the arms until positioned for best reception.
Room acoustics
Sound waves can be divided into two groups: direct and reflected sound. Direct sound emanates from the loudspeaker following an uninterrupted route to the listener’s ear. Reflected sound is an image of the original sound source traveling an indirect route to the listener. Reflected sound. is very important for stereo imaging and reinforces concert hall realism. Proper tone balance between direct and reflected sound is the function of room accoustics.
Drapes, carpeting, upholstery and even people absorb sound energy, thereby reducing reflected sound. Bare floors, walls, and hard surfaces add to reflected sound. A room with high absorption qualities will sound dead or lacking brilliance. A room with high reflective qualities will sound too bright or may even echo. To achieve a balanced environment, set speakers against a reflective wall, facing a less reflective wall on the other side of the room. As a general rule, do not place speakers against a wall having the same absorption or reflective qualities as the wall opposite it. (See Figure 10).
