My original 901s were the II version - acoustic suspension with the resonance pushed up to 200 Hz. The equalizer compensated and the boost at 20 HZ was about 40db. They sounded very good and bass was flat to 30 Hz, but I did need to drive it with a HK Citation 16 and the meters showed 200 watts on peak pipe organ music.
The switche to a more 'efficient' vented model was a step backward in my opinion.
Bob P.
The switche to a more 'efficient' vented model was a step backward in my opinion.
Bob P.