Sony SS-G7a (c. 1980)

A large floor-standing, three-way bass-reflex speaker system developed as a revision of the SS-G7. It has advanced driver materials and a symmetrical dual port design.

Overview

Sony's SS-G7a is a high-end floor-standing speaker system introduced around 1980 as an updated version of the SS-G7, which had been in production since 1976. It was made for audiophiles who wanted high fidelity. The G7a gets a titanium dome tweeter with boron carbide coating, an improved midrange voice coil design, and a revised crossover network. It is a three-way system with dual bass-reflex ports arranged symmetrically, plus adjustable controls for high and mid frequencies. The advanced construction and the excellent sound reputation didn't help much. Sales were limited, likely because of the high price of 158,000 ¥ for a design that was already several years old.

Specifications

Dimensions	51 x 94 x 44.5 cm
Volume	128 L
Weight	52 kg
Frequency response	30 Hz – 20 kHz
Nominal Impedance	8 Ohm
Max music peak	200 W
Max Sinus peak	100 W
SPL	94 dB / m / W or 96 dB / m (DIN)
Crossover frequencies	500 Hz, 4500 Hz
Controls	0...-4 dB (highs), 0...-4 dB (mids)
Bass driver	38 cm cone, 10 cm voice coil, Alnico magnet, 7 Ohm, 100W max
Mid driver	10 cm cone/dome, 65 mm voice coil, ferrite magnet, 6 Ohm, 60W max
High driver	3.5 cm dome, titanium with boron carbide coating, Alnico magnet, 6 Ohm, 30W max
Crossover	Impregnated selfs, 1.8 mm copper wire
Enclosure type	Three-way, bass-reflex with dual ports
List price	158,000 ¥ (c. 1980–1984)

Design

Sony built the SS-G7a by redesigning the earlier SS-G7. The tweeter is titanium with a boron carbide coating. The mid driver is revised and has an updated voice coil. The crossover frequency between the bass and mid drivers drops from 550 Hz to 500 Hz. A second bass-reflex port was added to keep the cabinet design symmetrical. The crossover uses impregnated copper wire inductors for improved performance.

Context

By 1980, Sony had sold over 10,000 pairs of the original SS-G7, a design dating back to 1976. The SS-G7a, despite its technical upgrades, did not achieve significant sales, likely because of its high price for a refined version of an older model. Some of the improvements made for the G7a were also applied to the concurrently launched SS-G4, which suggests a broader update across Sony's speaker line.

Reception

Owners describe the SS-G7a as big, heavy, efficient and easy to drive, with excellent sound quality. Multiple users report using them as primary speakers and praise the sound signature and performance. One noted they "totally outclass" their previous systems. Another found them "amazing" despite being hand-built units from around 1980 or later.

Market

A pair of SS-G7a speakers was listed in a Yahoo auction on November 30, 2023. They were originally priced at 158,000 ¥ between 1980 and 1984. No current market valuations or common failure modes are documented.

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