Sony SS-7600

Sony ULM-6

1 9 7 1 march 1971
1 9 7 4 1974

Ultra Linear Magnetic loudspeaker : a very advanced design for 1971 with an all-new membrane and magnet / spider / coil / polepiece design to avoid leakage of magnetic flux.

A part of the polepiece is sanded so that the flux at the periphery remains saturated enough. This reduces leakage to avoid negative feeback to influence the bobbin.
The polepiece itself is then covered with a thin copper layer so that the non-linearity that happens at its extremities becomes shorted.

The mobile front plate allows a three-position setting between acoustic suspension and bass-reflex modes, with an intermediary position.

Japan saw a few lower versions not exported.
The smaller SS-7300 did away with the horn and variable b-r port but retained the multi-amping feature ; a comment about them here - more than very positive. The smaller SS-7200 just had ULM drivers.

The SS-7600 was replaced by the somewhat different but identical SS-7660 (or ULM-66) in october 1973 but in Japan only.
Elsewhere, it was directly replaced by the SS-8150.
The three divers could be purchased on their own, too, and were all delivered with their dedicated factory-measured spec sheets.

The ULM speakers are much more beautiful than what the generally poor iconography allows to see : beautiful hand-made workmanship and excellent finish befitted well these very advanced loudspeakers. The design of the frame/grille bears its period but it is a pity nobody works like that anymore.

As all high-end Sony loudspeakers : give them a listen if you can - you'll be quite surprised.

Sony SS-7600, image 1 Sony SS-7600, image 2 Sony SS-7600, image 3
Sony SS-7600 specifications
Title Value
System : 3-way
acoustic suspension OR bass-reflex
Volume : 192L
Frequency response : 30Hz...20Khz
SD-3800W bass : 30cm
impedance : 8 Ohm
flux : 250,000 Maxwell
induction : 122000 Gauss
power in range : 70...200W
SPL : 96dB :/w /m
f0 : 20Hz (± 3Hz)
frequency range : f0...1Khz
dimensions & weight : 42,4 x 42,4 x 17,5cm / 11kg.
SD-1200M mid : 12cm
impedance : 8 Ohm
flux : 85000 Maxwell
induction : 12500 Gauss
power in range : 40...150W
SPL : 94dB /w /m
f0 : 185Hz (± 20Hz)
frequency range : 300Hz...7Khz
dimensions & weight : 17,4 x 17,4 x 15,6cm / 3,7kg
SD-6000T high : horn
impedance 8 Ohm
flux : 27000 Maxwell
induction : 16000 Gauss
power in range : 15...60W
SPL : 97dB /w /m
f0 : 2Khz
frequency range : 3...20Khz
dimensions & weight : 10,6 x 10 x 10,7cm / 1,7kg
Repartee : 600Hz (6dB/oct.)
?Hz (?dB/oct.)
Resonance frequency : 40Hz (± 5Hz)
Nominal impedance : 6 Ohm
SPL : 92dB /w /m.
Maximum handling : 100W
Highs setting : +2...-4dB
Mids setting : +2...-4dB
Dimensions : 80 x 35,62 x 42,4cm
Weight : 39kg.
List price : 66,000¥ (122,000¥ per pair - terribly expensive in 1971 !)
Sony SS-7600 : 0 topic
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page online since : november 2004
page updated : august 2010
page type : LGT / KNB
page weight : 232.81 Kb / 0 b

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