Audio Database


McIntosh MA6900 680,000yen(around the 2001 time)

Integrated amplifier carrying 5 band equalizer.

It is possible to emphasize or reduce five frequency bands to 12dB by 5 band equalizer circuitry.
By the center position of a thumb, it is completely removed from a signal circuit and a sound as it is of the input source can be checked.

The phone equalizer amplifier which suits a man-month type cartridge is carried.

The electromagnetic magnet switch which operates by a logic is carried in all the inputs, the output, and the dataport, and the digital logic IC has realized signal switching.
In this case, the contact plated with gold, the rhodium, and the ruthenium is enclosed in the tube of the glass filled with the gas of non-oxygen by inactivity, and the robustness is improved to the relay used.

The volume control of the motor drive corresponding to remote control is carried, the laser trim of the resistor was carried out and high-precision tracking is realized.

Output auto FOMA was carried, amplifier and a speaker were changed into always ideal matching conditions, and extension of life-span is realized, without spoiling a tone quality.

Various kinds of protection networks are carried as a measure against a risk management for preventing a protection of the amplifier under emergency abnormal circumstances itself, and a corruption of a speaker.
Although a power guarding consists of wave comparators which monitor the wave of an amplifier input and an output signal and nothing is usually outputted,When it is driven so that amplifier may output exceeding the maximum power capacity, and a difference arises in an input/output wave, a comparator controls amplifier gain and controls distortion of an output.
The sentry monitor is carried, the dynamic operating time of an output stage, a voltage, and an electric current are perceived, and an electric current is controlled in a non-destructive limit.
In addition, the in rushes protection which removes DC wastepaper which drops DC on a grounding, the temperature protection which does not worsen SN by an air cooling without blower, the turn-on latency which delays an operation of amplifier for about 2 seconds at the time of a power on, and the stress concerning the power transformer at the time of a power on is carried.

The input/output jack to which gilding was given is carried.

The chassis made from stainless steel is adopted as a chassis.

The serial-data output port is carried.

Large-sized-with illumination blue-eyes output window meter is carried.

Wireless remote control is attached.


Rating of a mode
Form Integrated amplifier
Output power
(at the time of both channel operation)
200W+200W (2ohm, 4ohm, 8ohm, sinusoidal consecutive output)
Load impedance 2ohm, 4ohm, 8ohm (independent termination)
Output frequency bandwidth 20Hz - 20kHz
THD 0.005% or less (at the time of 20Hz - 20kHz, 250mW-150W, and both channel operation)
Cross modulation distortion
(at the time of both channel operation)
A maximum of 0.005% or less (at the time of the arbitrary combination of 20Hz - 20kHz 250mW-200W)
* When peaking capacity does not exceed 400W of an Output power at the moment
Frequency characteristic 20Hz-20kHz+0 -0.5 dB
Preamplifier part maximum output voltage 8V (20Hz - 20kHz)
Input sensitivity Phono: 2.5mV (2.5V Output power, 0.5mV IHF)
High SFT Level: 250mV (2.5V Output power, 50mV IHF)
Power amp in: 2.5V (Output power)
SN ratio (IHF-A network) Phono: 90dB (at the time 10mV or less of inputs 84dB IHF)
High SFT Level: 100dB (at the time below of an Output power 90dB IHF)
Power amp: 110dB (at the time below of an Output power)
IHF dynamic head room 2.4dB (2ohm, 4ohm, 8ohm)
Dumping factor 100 (8ohm) or more
The maximum input signal Phono:90mV
High Level:8V
Voltage gain High SFT Level -> tape: 0dB
High SFT Level -> main: 20dB
Equalizer control 50Hz, 150Hz, 500Hz, 1.5kHz, 10kHz
Power source AC100V, 50Hz/60 Hz, 4.0A
Dimensions Width 444.5x height 181.0x depth of 419.1mm
Weight 33.8kg