+1 on running only one set at a time, it will sound better and I think the D9's are 4ohms so running them with another pair will be asking for trouble.
The BOSE 901's have some pretty specific room placement requirements so google for specific recommendations from BOSE.
The Cerwin Vega D9's are best pointed directly at your neighbors of course.
The BOSE 901's have some pretty specific room placement requirements so google for specific recommendations from BOSE.
The Cerwin Vega D9's are best pointed directly at your neighbors of course.
The BOSE 901's have some pretty specific room placement requirements so google for specific recommendations from BOSE.
The Cerwin Vega D9's are best pointed directly at your neighbors of course.