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MA6800
Commentary

An integrated amplifier developed as an amplifier with the same quality as a separate amplifier equipped with three elements of G. T. L (glass panel, output transformer, panel light).

Equipped with an output transformer, it provides unchanging high power for 8 Ω, 4 Ω, and 2 Ω loads, and can stably supply peak output current of 53A or more while extremely low distortion rate to frequencies far beyond the audible band.
The transformer also protects the speaker by preventing DC current from flowing out in the event of an emergency.

The signal system from the phono input to the final stage is basically the same as that of the Macintosh separate amplifier. In order to add the advantage of the integrated type, the signal path is shortened thoroughly, and internal interference and distortion are carefully eliminated.
In addition to the strict electromagnetic shielding of the power transformer, the layout of the printed board and cable has been thoroughly examined. The signal switches of the logic control are all glass-sealed reed relays.

The tone control circuit is completely bypassed in the flat position.

The infrared remote controller enables you to perform all major operations at hand.
The position of the master volume is digitally indicated by the LED indicator in the center of the panel, the LISTEN and RECORD signals can be selected independently, and the optional video and speaker selectors can be controlled.

It is equipped with a protection circuit unique to Macintosh which reaches Route 6 such as Power Guard and Centrino monitor.

Equipped with a power meter that displays the output power of voltage x current at a response speed that is approximately 10 times faster than that of a commercial VU meter.

A 6 mm core wire diameter cable can be directly connected to the speaker output terminal.

The output terminal of the preamp section and the input terminal of the power amplifier section are mounted and can be used separately.

Equipped with Macintosh's own continuous loudness control, it is possible to correct the loudness regardless of the volume position.

Model Rating
Type Stereo integrated amplifier
Rated Output (Both Channels Operating) 150W + 150W (2 ω, 4 ω, 8 ω, sine wave continuous output)
Load impedance 2 Ω, 4 Ω, 8 Ω (Independent Terminal)
Output frequency bandwidth 20 Hz to 20 kHz
Total harmonic distortion factor 0.005% or Less (20 Hz to 20 kHz, 250 mW to 150W, Both Channel Operation)
Intermodulation distortion factor (both channel operation) 0.005% or Less (250 mW to 150W at any combination of 20 Hz to 20 kHz)
Frequency characteristic 20 Hz ~ 20 kHz + 0 -0.5 dB
Signal-to-noise ratio (IHF-A network) Power Amplifier : 110 dB (Rated Output)
Preamplifier : 90 dB (10 mV input, 84 dB IHF)
High level : 100 dB (rated output, 90 dB IHF)
IHF dynamic headroom 1.8dB
Damping factor 40 or more
Power Guard Overdrive at 1 kHz up to 14 dB THD within 2%
Input impedance Phono : 47k Ω (65 pF)
High Level : 22k Ω
Power amplifier in : 20k Ω
Input sensitivity Phono : 2.5 mV (0.5 mV IHF at rated output)
High Level : 250 mV (40 mV IHF at rated output)
Power amp in : 1.4 V (at rated output)
Maximum input level Phono:90mV
High Level:10V
Tone control Up to 12 db boost / 12 db cut for Bass/Treble
Pwer 100 VAC, 50Hz/60Hz, 6.25A (UL/CSA1)
External dimensions Width 445x Height 179x Depth 537 mm (including knob)
Weight 31.8kg