User manual MCINTOSH MA5100

[. . . ] THE MclNTOSH MA 5100 STEREO PREAMPLIFIER/POWER AMPLIFIER $1. 25 Your MA 5100 stereo preamplifier/power amplifier will give you many years of pleasant and satisfactory performance. If you have any questions concerning the operation or maintenance of this instrument, please contact: CONTENTS Guarantee Installation How to Connect What the Controls Do And How to Use Them Balancing Your Stereo Listening to Your Stereo Performance Limits Typical Performance Charts Technical Description Block Diagrams 1 2, 3 3, 4, 5 5, 6, 7 7 8 8, 9 10 11 12 CUSTOMER SERVICE Mclntosh Laboratory Inc. 2 Chambers Street Binghamton, New York 13903 Phone: 607-723-3512 Take Advantage of 3 years of FREE Factory Service . Fill in the Application NOW. GUARANTEE Mclntosh Laboratory Incorporated guarantees this Instrument to be capable of performance as advertised. [. . . ] Turn the control to the center position for flat response. VOLUME The VOLUME control regulates the loudness in both channels. The VOLUME control has been pre- cision tracked throughout the listening range (0 to --65 dB) for accurate stereo balance. Some early stereo and mono recordings use LP equalization. created by a turntable or record changer and acoustically coupled feedback. FLAT filter disconnected. Balancing your Stereo The performance and enjoyment of a stereo system is greatly increased when the sound is properly balanced. The balance of the stereo system is affected by many things including room acoustics, furniture placement, room shape, small differences in loudspeakers, etc. To assist you in balancing your stereo system in your room here is the procedure to determine correct phase and program loudness. TO ADJUST PHASE FILTER . low frequency rumble and noise below 50 Hz are reduced when the switch is in the FILTER position. filter switch to reduce objectionable high-frequency noise such as record scratch. high frequency noises above 5000 Hz are reduced when the switch is in the FILTER position. LOUDNESS When the volume is reduced, the music will seem to lose much of its bass and some of its treble. This effect is due to the sensitivity characteristic of human hearing. The response of the human ear to bass tones decreases more rapidly than its response to notes centered in the mid-tonal range. The LOUDNESS control automatically provides the correct amount of bass required to compensate for this change in response of the human ear at low-loudness levels. In the COMPENSATED position the volume control is converted to a loudness compensated control. Use this position to listen at low volume and still hear full-bass response. BALANCE The BALANCE CONTROL adjusts for unequal volume in either the left or right channels. The volume of each channel can be varied relative to each other without affecting their combined loudness. turning the control to the left accents the left channel by reducing the right channel output. turning the control to the right accents the right channel by reducing the left channel output. 1. Press the MODE pushbutton to the MONO position. Turn BALANCE control to 12 o'clock position. [. . . ] The use of a two section volume control performs two important functions. First, the input section of the volume control increases the signal handling capability of the tone control amplifier. Use of this arrangement makes overdriving the tone control amplifer almost impossible. Second, the output volume control assures maximum signal to noise ratio regardless of the volume control position. [. . . ]