The B+ was the replacement for the Ohm B. It had the same woofer and tweeter but a second ''low'' tweeter was added to handle the lowest two octaves of the tweeter's range which vastly reduced failure problems. The cabinet size was the same and the sound was nearly identical. This was the direct competitor to the AR-3a.
Upgrade Options:
The upgrade option available for the OHM B+ is the addition of a SubBass Activator, which eliminates the drive below the speaker's natural response to reduce distortion and clean up the deep bass. This allows for lower distortion, higher output and deeper bass, plus uses a self-resetting protection circuit.
Trade-In Options:
Ohm allows up to $600 for the return of a complete pair of undamaged Ohm B+s toward 25% of the purchase price of new Ohm speakers.