I found B&W DM630 speakers are 2.5 ways system comprising 1 tweeter and 2 woofers—the upper and lower woofers are crossed-over with different frequencies. The tweeter and upper woofer are crossed at 3kHz as the conventional 2-way system, the lower woofer is crossed at 400Hz alone by an L3 inductor, referring to the schematic attached, though. I wonder whether it could be an alternative method to create a 2.5-way system by using mechanical crossover instead of electrical crossover.
What if the lower woofer is redesigned its enclosure type to be a bandpass system with cut-off frequency at 400Hz instead of current closed-box system with passively electrical crossover at 400Hz? Would the frequencies lower than 400Hz from upper and lower woofers interfere each other leading to worse results due to the difference of enclosure types between two woofers?
In fact, I recognize there is more usual and easier way that is to build them in 3-way system. But the 2.5-way is more fun if successful I think.
What if the lower woofer is redesigned its enclosure type to be a bandpass system with cut-off frequency at 400Hz instead of current closed-box system with passively electrical crossover at 400Hz? Would the frequencies lower than 400Hz from upper and lower woofers interfere each other leading to worse results due to the difference of enclosure types between two woofers?
In fact, I recognize there is more usual and easier way that is to build them in 3-way system. But the 2.5-way is more fun if successful I think.
Attachments
Bandpass would give a faster phase change, I would be worried it will interfere when used as a 2.5 way. You could simulate.
mechanical crossover alone won't work. Not even in a bandpass as Don Highend reported from the project "let's dance"
However with 6db plus bandpass it worked quite well, here a 1 and a half way design. All ready developed!
However with 6db plus bandpass it worked quite well, here a 1 and a half way design. All ready developed!
Attachments
What AllenB said. At the bottom, you would have to fine-tune carefully both boxes to match the two responses, which in a 2.5-way are identical by design; at the top, the at least 12 dB/oct low-pass response won't integrate as easily with the mididwoofer as the 1st order of a conventional 2.5 way. But yeah, by all means simulate and see what you get.