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Yamaha NS-690 II Speakers?? Help Identify

I recently purchased a really nice pair of Yamaha speakers at an estate sale that needed refoaming. After fixing them, I hooked them up and can't believe that they sound this good. The cabinets are overbuilt and they are very heavy. Look almost identical to the NS 1000. Does anyone know anything about these? They must be high end. What was the original retail? I have never seen another pair. Thanks all.
gwoodall
uraniumcommittee
60 posts
 
I owned a pair for a while (1976-1981). They were decent, but had 'holes' in the response curve that I could hear. I eventually sold them and moved to the Rogers Studio 1, which was a far better speaker. After 20 years with those, I sold them and got a nice set of Yamaha NS-1000M's, a far better speaker than either of the others.
uraniumcommittee
60 posts
 
This should be of interest:

http://www11.plala.or.jp/se_ke5583/YAMAHA/speaker/index.html
vonriess
5 posts
 
The specs on Yamaha NS-690II:
Impedance: 8 ohm
Frequency response: 35-20,000 KHz
Sensitivity: 90 db
40 watts nominal/80 watts max
Woofer: 300mm cone type
Midrange: 75mm soft dome
Tweeter: 30mm soft dome
Adjustable midrange and tweeter output
Dimensions: 14"(W) x25"(H) x12.5"(D)
Weight: 59 lbs each
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