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In Reply to: RE: Lowther on JE Lab OB posted by FTT on March 31, 2009 at 18:31:09
Lowther drivers are linearly descended from Voigt's original design which was intended for front horn use, hence their rising response and severely limited excursion capability. They are not a proper choice for wide band OB service although they have been used quite successfully on open baffles in multi-way systems where early LF roll-off is introduced to limit excursion.
Brian.
I agree with your summary of the Lowther driver's initial design, but not with your assessment of Lowther's performance in open baffle designs.
Granted, they were not designed for open baffle speakers, but they work oustandingly well in that service. It is true that you cannot expect to plug and play them in open baffle service. But if you use the 15 ohm variety, which has 3mm of x-max, and apply the appropriate crossover components, which are not very complex (only a single inductor in the signal path), then they are quite amenable to open baffle service, and in fact, excel in that service. The thin paper driver, as it turns out, was not so amenable to backhorns and any compression chamber designed speaker, because of the ease for reflected sound to echo back through the driver, and because the cone can deflect easily due to backpressure causing distortion.
I would enABL the Lowthers to make them world class.
Retsel
If you reread my post Retsel you will see I make positive mention of their use in OBs when in a multi-speaker system.
It was specifically their use in the JE Labs baffle, which was designed for broadband drivers like the WE 755, that I was discouraging.
;o)
Brian.
Then it may not be worth to try it.
Thanks.
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