NEC M-1000 mono block power amplifier
This is very sought after model in japan.
No longer able to find it in Japan local market.
 
4 channels or 2 channels bridged
Very powerful and superior sound quality
synchronize remote controllable
motorized volume controller
Balance inputs or gold plated RCA
Can connect  equipment's directly
5hz to 300khz frequency response
0.006% THD
12Kg weight each
1991 model, cost 70,000 yen each
 
This is 100V original Japanese model
please look for "100v/1000W step down transformer" 
(if you intend to use it other than 100V)
 
Click here for technical specifications