McIntosh
The MPI 4 is a laboratory-grade instrument. It continuously monitors the quality of the performance of a stereo system. It can sample and display signals from the tuner, preamplifier and power amplifier without reconnecting cables.
As a tuning aid exact FM station selection and precise tuning is seen. Displays of FM are signal strength modulation percentage and multipath interference; of audio signals are stereo balance, amplitude, phase and channel separation. Output power of the power amplifier can be seen at y instant during program perform or stored to develop a trend several minutes. With the a of test records, the MPI 4 can w compliance and trackabilily of a phono pickup, frequency response of the preamplifier and power amplifier, audio distortion and stered speaker balance. In the dual trace mode, the left and right stereo chan nels appear simultaneously and sepa-rately on the screen for direct com
parison. In short, the MPI 4 is a professional measuring instrument that assures you continuously that your system is performing as expected. You never again need to wonder about the performance of your stereo.
MAXIMUM PERFORMANCE INDICATOR
WEEP FREQUE
The MPI4
-
maximum performance from your stereo system •"once in
- a view of the separation provided on any signal source
- absolute balance of your stereo channels from phono cart
DUAL TRACE
Each channel of stereo signal is displayed tion. Comparison of the signals assists in comparison of recordings, the quality of stereo information in the source and much other valuable information.
The audio level of stereo signals is dis played as two vertical columns on the screen. The height of each column is deter-mined by the power or amplitude of the input signal
Action can be stopped and held to permit close comparison between the highest levels attained by left and right channels.
You will protect your record investment extend the life of your records, and reduce needle wear when the turntable is properly set up. With the aid of test recordings the MPI 4 will assist in this proper set up. The display assists in properly adjusting for proper tracking force, best tracing vs track-ing force, anti-skate, proper phasing, and channel separation
| 1.1 T | 15. | REAMP | |
|---|---|---|---|
| 0- | ×/ 1.1 | 14 | 1000 |
| . sal per | 1/ -11 | 300 | |
| AL STREET | I I F | 100 | |
| 10-10- | |||
| 10 | |||
| -10- | |||
| -3 | - 10 | ||
| 0 | 0.3 | ||
| 12 | |||
| 100% ILVEL | loc% | WATTS |
FM TUNING You'll see signal strength, center channel FM tuning and a reference for multipath distortion elimination. The image is a dis-play of the tuner IF curve. Signal strength is the vertical axis. Horizontal center is the conter of the detector and IF curves. Proper center of the detector and IF curves. Proper tuning gives minimum distortion and maximum listening pleasure on all kinds of FM broadcasts
helps you
lifetime"programs flawlessly recorded • better FM reception • a measurement of the performance of the phono cartridge dge to speakers • an accurate measurement of power output
Program material that is 'out of phase sounds unnatural and thin; 'in phase' sounds alive and rich. Occasionally a pro-gram source will be 'out of phase.' On the MPI 4 you can see the phase relationship so you can correct the condition.
Accurate system balance assures you of visual indication of the balance of your stereo system. You can check and correct the output balance of your stereo phono your stereo system is in balance when you use an MPI 4
from all stereo program material. The display changes position and shape with the ram material to permit interpretation of what the display means to your listening enjoyment. You see what makes a good stereo record sound good. You will know why your records sound the way they do.
Multipath reception deprives you of FM listening enjoyment in several ways:
- noise level increase
- · distortion is introduced into the program material
- stereo separation is reduced the stereo effect may be completely lost
- stereo indicators may fail to function
MPI 4 Performance Limits
Our Promise to You
Performance Limits are the maximum deviation from perfection permitted for a McIntosh instrument. We promise you that your MPI 4 must be capable of performance at or exceeding these limits or you get your money back. Melatosh is the only manufacturer that makes this guarantee
Sensitivity: 100 rnV/cm Input Impedance: 250.000 ohms Signal Strength Polarity: Selectable positive or negative -R (Horizontal Amp.): 1.75 mV RMS/cm (5 mV P-P/cm) Frequency Response: 5 Hz to 50,000 Hz (-3 dB) Input Impedance: 250,000 ohms POWER LEVEL Sensitivity: 0.1 to 1000 watts continuous for full scale indication (+3 dB) Frequency Response: 5 Hz to 100,000 Hz (-3 dB) Input Impedance: 75.000 ohms Calibration: For bridging 4, 8 or 16 ohm speaker loads PREAMP LEVEL Input Impedance. 250,000 ohms Sensitivity: 1.6 mV RMS/cm (4.5 mV P-P/cm) In the single trace mode it is triggered by the displayed waveform In the dual trace mode the trigger is selectable. Left channel, right
YOU SHOULD OWN MCINTOSH BECAUSE
- McIntosh instruments have always been designed for long lite with low maintenance costs and high quality performance. McIntosh in-struments have been and are the LABORATORY STANDARD for the orld. Until 1949 the performance requirements for a McIntosh had long been an engineering dream. They became a reality with the in-troduction of the first McIntosh amplifier. Through all these years Mc-Regardless of age, most McIntosh instruments are still in use today Amplifier clinics held all over North America have shown that most
- performance that were required of them when new. Used McIntosh instruments enjoy the highest resale value in this field. Retailers report that customers are constantly searching for um return on your investme
Franchised Dealer
LEVEL INDICATION
Normal; 250 µs rise time 500 ms decay time
-
Dook
- Reset
LOW PASS FILTER
19,000 Hz and 35,000 Hz rejected by at least 30 dB
RETICLE LIGHTING Selectable: On-Of
CATHODE RAY TUBE
3 inch tube, calibrated 5 x 6 cm 1000 volt accelerating potential
AUTOMATIC INTENSITY CONTROL
phosphor damage
SEMICONDUCTOR COMPLEMENT
23 transistors
29 diodes POWER SUPPLIES
Regulated to give equivalent performance for line voltages of 100 to
POWER REQUIREMENTS
120 volts, 50/60 Hz, 50 wat
SIZE
Front panel measures 16 inches wide (40.65 cm) by 5-7/16 inches guired is 1-1/2 inches (3.85 cm) in front of the mounting panel
FINISH
ront panel is anodized gold and black with special gold/teal nomenclature illumination. Chassis is black
MOUNTING
Exclusive McIntosh developed professional PANLOC WEIGHT
21 pounds (9.55 kg) net, 33 pounds (15 kg) in shipping carton
- McIntosh dedication, not only to improvements, but also to fundamentals, has justified many patents on refinements as well as basic circuit structures.
- The size of the McIntosh, investment in professional testing instruments bears eloquent testimony to the commitment to acquire knowledge for the benefit of our customers. On a percentage basis Mc tosh probably invests more of its sales dollars in testing facilities than anyone else in a like business. As new testing instruments are produced that update the McIntosh ability to know, McIntosh invests in them ... wave form analyzers—real time analyzers—low distortion signal generators, etc. Only through this impressive investment, through continuous testing and research, through product analysis and endless measurement can McIntosh promise and deliver to you reliability, long life, performance, highest value, and freedom from
- Since its beginning in 1949, McIntosh Laboratory has had the same ownership and management. McIntosh is the only company in this industry that has had this kind of history. McIntosh has been and is
- do as much for you as it possibly can?
McIntosh Laboratory Inc. 2 Chambers St., Binghamton, N.Y. 139O3 Phone area 607 723-3512
BE042003
Loading...