Headphone Guru reports:

A new upgrade model for the legendary Sennheiser HD 650 - "perhaps the most famous Sennheiser headphone of all time".

" Overall, the Sennheiser HD 660S represents a stronger, and arguably better version of its predecessor, the HD 650. "

DarkLantern blog - darklanternforowen.wordpress.com

I have the 650's bought on TradeMe I think. About 1,000 years ago. Some minor probs (grill fell out, cable broke) but still going strong. I bought AKG 701's as a replacement. Sold them with a few weeks at a small loss. Been dreaming of the 800's but never got round to it. I have had a lot of Senns and generally they are a 'Go To' Brand.

The 660's may bring aomething to the party - but I for one will not find out.

My budget-conscious son opted for the Massdrop HD 6XX version.

darklantern.proboards.com/thread/729/massdrop-sennheiser-hd-6xx-headphones

DarkLantern blog - darklanternforowen.wordpress.com