GF-1
(1991)

70kg + 80kg = 150kg ...each!

But what is more remarkable is that Yamaha stuck to its magic formula: Beryllium. If it was here used somewhat differently (forged vs. vapor deposited), this shows remarkable constance. A constance confirmed market-wise by the astronomical number of Be-equipped loudspeakers Yamaha did sell worldwide since 1975.

The GF-1, however, is a very different beast than anything tagged NS...
Made of two separate enclosures, powered by 4 amplifiers and frequency dividers, turbo-powered in the bass dept by Yamaha's stable YST active servo-controller / enhancer, the GF-1 was a (very) limited edition object, a cost-no-object extravaganza. And at 7,000,000¥ it is understandable Yamaha didn't expect to sell many, even there was a technically identical but lesser-veneered version at... 5,000,000¥.
A dedicated 2x 100W Class A power amplifier with external power-supply was optionally made available to drive part of the GF-1: GFD-1. Its preamp section outputs the signal at a max. of 25V and 0,012Ohm ! It cost 1,200,000¥...

Along Sony's SS-GR1, Yamaha's GF-1 was given in 1991 a COTY award. An enormous dedicated power amplifier with basic preamplifier functions (source selection and balance) was offered later on: GF-D1. A rarity in itself.
After that, like most japanese brands, Yamaha retired from the high-end market and concentrated on mid-end HT receivers and the MLan system - the GF-1 was one of the last exclamation points of a now bygone era.