Not knowing any more about the 890c Bolero than what you just posted, I presume they have a passive radiator.
Lowering the tuning frequency of a passive radiator will not necessarily give you a "better" bottom end. It will re-shape the speaker's low-end frequency response, typically raising the -3 dB point but making the rolloff more gradual. This may or may not be a net improvement; depends on what the in-room frequency response was to begin with.
Duke
dealer/manufacturer
Lowering the tuning frequency of a passive radiator will not necessarily give you a "better" bottom end. It will re-shape the speaker's low-end frequency response, typically raising the -3 dB point but making the rolloff more gradual. This may or may not be a net improvement; depends on what the in-room frequency response was to begin with.
Duke
dealer/manufacturer