Sony SS-G7a

1 9 8 0 1980
1 9 8 4 1984

By 1980, Sony had sold in excess of 10,000 pairs of SS-G7. Yes, indeed, no mistyping here: ten thousand pairs !

So a little revision was deemed necessary : added were boron carbide coating on the titanium tweeter, a new voice coil design for the mid driver and the crossover frequencies between the bass and mid drivers was lowered by 50Hz (500Hz instead of 550Hz).
Also, a second bass-reflex port was added to keep symmetry... symmetric.

The rest is the same : 94dB/W/m SPL, 8 Ohm nominal impedance and... still 52kg on the balance.

However, by 1980, the SS-G7 was an "old" design dating from the almost prehistoric year of 1976 so, unlike the original G7, this revised version didn't sell much... if at all : 158,000¥ probably was too much for such an old thing, whatever its recognized excellence.

Launched at the same moment, the SS-G4 did benefit from the updates made on the SS-G7a.

Sony SS-G7a, image 1 Sony SS-G7a, image 2
Sony SS-G7a specifications
Title Value
BASS driver : 38cm cone
straight membrane + rigid grooves
liquid-impregnated damping rolled edge
perforated 10cm voice coil
perforated Alnico magnet
Diecast aluminium frame
9000 gauss
7 Ohm / 100W max.
MID driver : 10cm cone/dome
65mm voice coil
ferrite magnet
12000 gauss
6 Ohm / 60W max.
HIGH driver : 3,5cm dome
20µ hemispherical titanium dome with boron carbide coating
single piece dome/membrane
Alnico magnet
16000 gauss
6 Ohm / 30W max.
Filter : impregnated selfs
1,8mm copper wire
Controls : 0...-4dB (highs)
0...-4dB (mids)
Type : 3 way tuned ports bass-reflex
Frequency response : 30Hz...20Khz
Repartee : 500Hz
Nominal Impedance : 8 Ohm
Max music peak : 200W
Max Sinus peak : 100W
SPL : 94dB / m / W
or 1,6W (96dB/m, DIN)
Dimensions : 51 x 94 x 44,5cm
Volume : 128L
Weight : 52kg.
List price : 158,000¥ (1980...1984)
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page online since : february 2008
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