I had owned a pair of RS-IIb in the past and sold them to try other speakers. I always thought they were some of the better performing speakers I had owned and hoped to find another pair. As luck would have it - a pair of RS-IIa speakers was listed in northern Va. I made the drive yesterday to pick them up. Former owner didn't have bass controller, but I have one coming from another site. Hooked speakers up yesterday afternoon to confirm there are no issues - and all drivers work perfectly. Even without bass controller, they sound very nice. Very happy to have a pair of Infinity speakers again.