Audio Database


Marantz SM-9 225,000yen(around the 1982 time)

Stereo power amplifier developed based on the tradition of the Marantz of employing the highest power device efficiently completely in the optimal operation and the best circuitry.

The nakedness property is sharply raised by using a super high fT (90MHz) power transistor for the circuitry of a whole page push pull perfect DC stream composition.
The Low-TIM design original with a Marantz which banishes a TIM by low NFB-ization was put into practice, and AB class output quality from Loule Bell to the maximum output has been obtained.

In the power-source part, the interference between channels and between stages is suppressed by carrying the mass transformer which made the sub- side the right-and-left perfect separate volume structure in power amplification stages, and also carrying an exclusive transformer also in the voltage amplification stage.
Furthermore, powering capacity with the stable margin is secured by reliable stream compositions, such as adoption of filter capacitor 15,000micro-Fx4 excellent in the RF property.

The oxygen-free-high-conductivity-copper line of a high purity is adopted as all the included lead wire for the drawer line of a transformer.
Moreover, the direct speaker termination which does not pass a contact is carried apart from the subspeaker termination in which 1 / 2 changes are possible.

The energy sensor type which detects an excessive output and always suppresses the signal of a drive transistor in a safety area is adopted as a protection network.
It is the design focused on musicality which opens an output wide and does not interrupt a performance.

High precision peek meter and a traditional sub panel are carried in the front panel, and it has become the design stored in the mahogany cabinet.

Rating of a mode
Form Stereo power amplifier
Output power (20Hz - 20kHz, both channel simultaneous operation) 150W+150W (8ohm)
THD (at the time of 20Hz - 20kHz, and an Output power) 0.01% or less
Cross modulation distortion 0.01% or less
Frequency characteristic DC-100kHz+0 -1dB
Input sensitivity/impedance 1.5V/30kohm
Dumping factor 100 (1kHz, 8ohm) or more
SN ratio (IHF-A) 120dB
Power dissipation (Electrical Appliance and Material Control Law) 400W
Dimensions Width 474x height 172x depth of 345mm
Weight 23.5kg