Marantz Sm-7

October   1 9 7 8 october 1978
1 9 8 1 1981

Part of the 1st batch of ESOTECs (not yet named as such), the Sm-7 was directly derived from the Model 300DC but with better specs here and there, ESOTEC oblige.

The two "sub-speaker" sets benefit from the gain pots while the "direct" set circumvents this extra length of wire and solder.
The Japanese versions have a back switch selecting the DC or AC coupling of the inputs, a feature found on 2nd generation ESOTEC such as Ma-5 or Sm-1000.

Inside are four bigga 15,000µF caps, a thermally-matched dual-fet differential circuit makes the input and four "Marantz-developed" 60MHz fT / 200W Pc the output transistors.

Available in black (EU) or in gold (US, JP) with an optional wooden case (US & JP), the Sm-7 was replaced by the fairly similar Sm-9 in mid 1981, the latter being, this time, a strictly Marantz Japan component.

Marantz Sm-7, image 1 Marantz Sm-7, image 2 Marantz Sm-7, image 3
Marantz Sm-7 specifications
Title Value
Power : 2x 150W (continuous RMS, 20Hz...20Khz, 8 Ohm, 0,01%THD)
2x 190W (continuous RMS, 20Hz...20Khz, 4 Ohm, 0,01%THD)
Bandwidth : 5Hz...100Khz (8 Ohm, 0,05% THD)
Frequency response : 20Hz...100Khz (+0dB / -0,2dB)
DC...100Khz (+0dB / -1dB)
THD / IMD : less than 0,01% (8 Ohm, 20Hz...20Khz)
Damping factor : more than 100 (8 Ohm)
Residual noise : 0,034mV
Inputs : 1,5V / 30kOhm
PC : 850W max.
Dimensions : 41,6 x 14,6 x 33,2cm
Weight : 22kg.
Features : gold-plated inputs
two pairs of sub-speakers connectors
optional wooden cabinet with mahogany veneer (US model)
black-face version (Euro model)
page online since : october 1978
page updated : not yet
page type : LGT / KNB
page weight : 215.21 Kb / 0 b
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