User manual MCINTOSH MAC4280

[. . . ] Record the purchase date here: Purchase Date Upon application, Mclntosh Laboratory provides a Three-Year Service Contract. Your Mclntosh authorized Service Agency can expedite repairs when you provide the Service Contract with the instrument for repair. To assist, record your Service Contract number here: Service Contract Number Your MAC 4100 Solid State AMFM/FM Stereo Receiver will give you many years of pleasant and satisfactory performance. If you have any questions, please contact: Contents INTRODUCTION . . . 2 INSTALLATION. . [. . . ] The loudness circuitry is completely independent of the volume control. Therefore, any desired amount of compensation can be introduced regardless of volume control position. 1 dB. This extreme accuracy is obtained through special electronically controlled resistance element trimming. Since the switch commutator touches only contact pads and not the precision resistor elements, tracking accuracy is permanently maintained and is noise free. HEADPHONE JACKS VOLUME CONTROL The VOLUME control is a precision step control manufactured for Mclntosh Laboratory. It has 32 steps with a 70 dB range, plus volume off. Left and right channel tracking are within The front panel HEADPHONE jacks have been designed to feed low impedance dynamic headphones. Electrostatic headphones generally require higher power than dynamic headphones. They must be connected to the speaker push connectors on the rear panel. Plug headphones into the front panel HEADPHONE jack. Adjust the front panel VOLUME control for comfortable headphone listening. Signal to the headphone jacks is not affected by the SPEAKER switches. Front Panel indicators The MAC 4100 has three dial scales: 1. The balance of the stereo system is affected by many things including room acoustics, furniture placement, room shape, small differences in loudspeakers etc. Factors that affect proper stereo balance are correct phase for both channels and equal program loudness. If the sound is not directly in front of you, reverse the leads on one of the loudspeakers only. When the sound comes from the midpoint between the speakers they are in phase. TO BALANCE LOUDNESS Press the MONO pushbutton. Turn the BALANCE control to the 12 o'clock position. While the program is playing stand between the two loudspeakers. Listen for a difference in loudness between speakers. If there is a difference in loudness, turn the BALANCE control toward the speaker that is not as loud. Adjust the BALANCE control until the sound is balanced between both speakers. TO ADJUST PHASE Press the MONO pushbutton. Turn the BALANCE control to 12 o'clock. [. . . ] The protective circuit reacts in milliseconds. Speakers remain disconnected until the cause has been fixed. Under normal operating conditions the protective circuit has no affect on the operation of the output circuit. This is another example of Mclntosh continuous protection. POWER GUARD TURN ON DELAY The MAC 4100 has transient-free turn on and turn off characteristics. [. . . ]