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 6400

McIntosh has been manufacturing Integrated Amplifiers since 1963, with the current models representing the fifth generation of this popular combination design. The same design concepts and performance innovations that McIntosh has developed for their separate components have been incorporated into these combinations models.

The preamplifier sections reproduce traditional stereo audio with unsurpassed sonic accuracy without sacrificing control flexibility. Tone controls and loudness compensation are active circuits which provide precise adjustment and when set in the flat position, are electrically neutral and have no effect upon the signal. Flexibility is enhanced through full function remote control and traditional McIntosh ease of use is demonstrated by the layout and function of the controls.

The power amplifier section are identical in design to those of separate mcIntosh amplifiers, offering the same performance and traditional McIntosh design integrity. Both models provide illuminated power level wattmeters, which indicate the true power output delivered to the speakers, as well as other innovative circuit designs that together contribute to the legendary McIntosh sound.


Power Output: 100 watts at 4 ohm

Frequency Response: 20 – 20,000 Hz, +0, -0,5 dB

Total Harmonic Distortion: 0,005%

IM Distortion: 0,005%

IHF Dynamic Headroom: 4 ohms, 2.4 dB

Damping Factor: 40 at 4 ohm

Output Indicator: Meters

Output Interface: Direct Coupled

Pre Section


Phono: 2,5 mV rated output (0,5 mV IHF)

High Level: 250 mV reted output (50 mV ihf)

Power Amp IN: 2,5 mV rated output

Signal-to-Noise Ratio:

Phono: 90 dB, below 10 mV input, (84 dB IHF)

High Level; 100 dB below rated output (91 dB IHF)

Max. Input Signal

Phono: 90 mV

High Level: 10 V

Bass/Treble Control: variable 12 dB boost to 12 dB

Inputs: 7 high level

Input Impedance:

Phono: 47 kohms and 65 pF Capacitance

High Level: 22 kohms

Phono: Dual Aux/MM Phono


Switching for 2 speakers;

Signal Processor loop;

2 tape Monitor switches.

Dimensions (W x H x D): 445 x 137 x 508 mm (17-1/2 x 5-3/8 x 20 in)

Weight (Net): 18,6 kg (41 lbs)

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