Sony SS-5GX

Variation and sibling to the Falcon SA-20F - an extra-rare variation of the very-much-quite-better kind : the 5GX is a sound bolid.

Unlike the SA-20F and SA-10F, the SS-5GX is an acoustic suspension (good) , has no built-in power amp and no leaf tweeter either. Beautiful warm looks make up for that.
The 5GX however also has a back heatsink because the bass driver's voice coil is connected to a Heat-Pipe so as to allow a better efficiency at transforming the audio signal into acoustic energy rather than accumulated heat.

That Heat-Pipe seems like an early version of the system as the freon-filled tube isn't made of thin aluminium but of a semi-rigid and thick rubber or plastic of some kind. Having the bass driver efficiently cooled was to allow a bigger sound to come out of a small enclosure.

Both drivers' frames are made of cast aluminium. The high-quality filter has mylar caps and quality inductors with large core and heavy wire. The enclosure is beautifully veneered with natural walnut.

The SS-5GX was slightly later advertised as perfect match for the Precise P7 system.

At least one 5GX pair was custom-finished at the factory in "piano black" with the signature of Heitaro Nakajima slikscreened in gold on the sides (under the last gloss lacquer) ; this was within the regular s/n run so they must've been made for a special and impromptu occasion.