What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

McIntosh MA 6800

Those considering a McIntosh system for the first time will find integrated amplifiers a comfortable place to start. In virtually every respect the MA6800 perform as well as McIntosh separates. Both models incorporate premium McIntosh technologies – including autoformers, Power Assurance, and Silent Electromagnetic Switching – as well as several features that facilitate system integration and expansion.

An impedance mismatch between a power amplifier and a loudspeaker can cause distortion and a reduction in power. The legendary McIntosh autoformer is a hand-crafted transformer with output connections for 2, 4, and 8 ohms, allowing an ideal impedance match between amp and speaker. A McIntosh amplifier with an autoformer can also safely drive multiple speakers connected in parallel without shortening the life of the output stage. There is absolutely no performance penalty with an autoformer. In fact, its frequency response exceeds that of the output circuit itself, and extends well beyond the audible range. Distortion is so low it is virtually immeasurable.

2 x 150 watts (8/4/2 ohms)
Exclusive McIntosh output autoformers
Wide power bandwidth with ultra-low distortion
Exclusive McIntosh Power Assurance System:
Power Guard® clipping protection
Sentry Monitor® current protection
Thermal Cutout
DC Failure protection
Turn-On Delay
Soft Start inrush protection
Illuminated peak-responding meters
Silent electromagnetic switching
Precision-trimmed volume control with digital readout
Active Variable Loudness Compensation
Exclusive McIntosh tone controls
8 source selections (phono input on MA6800 only)
Switching for 2 pairs of speakers (with optional SCR3 Speaker Relay)
Independent listen and record selection
Dual processor loops
Accommodates more sources with McIntosh MVS3 A/V Selector
Control data output for source components
Remote power control
Remote operation of lights, screens, and drapes with McIntosh HC1 Home Controller
Power and mute indications shown on multizone keypads and sensors
Electronically regulated power supply with double-shielded transformer
Gold-plated input and output jacks
Fanless convection cooling
Modular construction with steel chassis
Glass front panel with illuminated nomenclature
Infrared remote control
Connector for external IR sensor or keypad controller
Headphone jack (MA6800 only)

RMS Power Output (8/4/2 ohms):
150W min. sine wave continuous average power output per channel
from 20Hz to 20kHz with both channels operating
Output Load Impedance:
2, 4, or 8 ohms
Rated Power Band:
20Hz to 20kHz
Peak Output Current:
> 50 amperes
Total Harmonic Distortion:
0.005% max. at any level from 250 milliwatts to rated power per
channel from 20Hz to 20kHz with all channels operating
Intermodulation Distortion:
0.005% max. if instantaneous peak power output
does not exceed twice the rated output
Dynamic Headroom:
Frequency Response:
20Hz to 20kHz, +0 / -0.5dB
Input Sensitivity:
High level: 250mV for rated output (1.4V at Main out)
Phono (MA6800 only): 2.5mV for 2.5V rated output (0.5mV IHF)
Main in: 1.4V for rated output
Maximum Input Signal:
High level: 10V
Phono (MA6800 only): 90mV
S/N Ratio (A-Weighted):
Power amp: 110dB below rated output
High level: 100dB below rated output
Phono (MA6800 only): 90dB below 10mV input (84dB)
Damping Factor:
> 40
Input Impedance:
High level: 22k ohms
Phono: 47k ohms, 65pf
Main in: 20k ohms
Power Guard®:
Clipping is prevented and THD does not exceed 2%
with up to 14dB overdrive at 1kHz
Tone Controls:
Bass and treble: ±12dB
Power Requirements:
120V 50/60Hz, 6.5A
Dimensions (h x w x d):
inch: 7.062 x 17.5 x 20
cm: 17.9 x 44.5 x 50.8
knob clearance: 1.125" (2.9 cm)
70 lbs. (31.8kg) net
89 lbs. (40.4kg) shipping

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