McIntosh MA6900G

Commentary

Only 150 units of this integrated amplifier were produced to commemorate the establishment of Macintosh Japan.

Gold stainless steel panels are used for chassis and side panels.
A high-grade speaker terminal is also used.

The President of Macintosh Laboratory, Charles Lindor himself writes his own autograph on each unit.
Also, there is a limited number of serial numbers on the top cover.

Equipped with a 5-band equalizer that can adjust five frequencies within ± 12 dB each.
The center position of each knob is a flat position that bypasses the circuit.

It uses an electromagnetic switch filled with inert gas. This switch is resistant to oxidation, and enables distortion-free signal switching without contact failure for a long time.

Equipped with a wide-range output auto-former, it delivers equivalent output under both 2 Ω, 4 Ω, and 8 Ω loads while maintaining broadband characteristics.
It also protects the speakers from damage to the system, such as power transistor failures.

It is equipped with a power guard in which the comparator limits the gain and controls the output distortion when the input / output waveform difference exceeds the maximum power capability, and a sentry monitor circuit which monitors the dynamic operation time, voltage and current of the output stage and controls the current to be kept within a safe level.
In addition, protection circuits such as DC protection, temperature protection, turn-on delay and in-rush protection are incorporated.

Equipped with a Blue Eyes Power Meter that displays the actual output power.

Model Rating

Type	Integrated amplifier
Power Amplifier Unit
Rated output	Stereo : 200W + 200W (2 Ω, 4 Ω, 8 Ω)
Input Sensitivity / Impedance	2.5V/20k Ω
Preamplifier Section
Input Sensitivity / Impedance	Line : 250mV/22k Ω Phono MM : 2.5mV/47k Ω
Gain	Line → Preout : 20 dB Line to tape output : 0 dB
<General>
Total harmonic distortion factor	Not more than 0.005%
Speaker output	1 System x3 (for 2 Ω, for 4 Ω, for 8 Ω)
Input terminal	Line RCA : Route 6 Line XLR : 1 system Phono MM : 1 system
Output terminal	Preamplifier output RCA : 1 system Recorded output RCA : 1 system
Power consumption	4.4A
Maximum external dimensions	Width 445x Height 198x Depth 476 mm
Weight	34kg
Attachment	Remote control