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<blockquote data-quote="Mark DeArman" data-source="post: 99892" data-attributes="member: 950">Re: Passive All-Passed Three-Way Dual 8in and 1in exit Driver BoxWell it&#039;s really hard from the published impedance response to tell whether it is three or two-way.&nbsp; Zmin ~= 5.5Ohm falls in that range where it could go either way.&nbsp; If it was higher I would assume it was two-way with the drivers in series.&nbsp; Probably an 8 Ohm LF and 16 Ohm MF driver wired in parallel or through some type of three-way/two-way network.&nbsp; For their design, with the driver spacing as it is, there is no need for full three-way passive, unless there are issues with the LF driver in the upper mid.Anyway, I&#039;ve built prototypes of boxes like the FA28 before.&nbsp; Although, when I made them I individually chambered and tuned the two 8 in. drivers. I find it kind of odd that the impedance shows that the drivers in the FA28 are significantly over damped, giving up a huge amount of low end sensitivity.&nbsp; Really, I&#039;ve just never been happy with the way coaxial 8 in. drivers sound.&nbsp; I like having a properly designed horn loading the compression driver better than the compromise 8 in. coax solution.&nbsp; In larger speakers, like our McCauley S15, 15 in. coax, I have been pretty happy with the response.&nbsp; In fact there is a quite a bit of improvement due to the horn loading the 15 in. diaphragm.</blockquote>

[QUOTE="Mark DeArman, post: 99892, member: 950"] Re: Passive All-Passed Three-Way Dual 8in and 1in exit Driver Box Well it's really hard from the published impedance response to tell whether it is three or two-way. Zmin ~= 5.5Ohm falls in that range where it could go either way. If it was higher I would assume it was two-way with the drivers in series. Probably an 8 Ohm LF and 16 Ohm MF driver wired in parallel or through some type of three-way/two-way network. For their design, with the driver spacing as it is, there is no need for full three-way passive, unless there are issues with the LF driver in the upper mid. Anyway, I've built prototypes of boxes like the FA28 before. Although, when I made them I individually chambered and tuned the two 8 in. drivers. I find it kind of odd that the impedance shows that the drivers in the FA28 are significantly over damped, giving up a huge amount of low end sensitivity. Really, I've just never been happy with the way coaxial 8 in. drivers sound. I like having a properly designed horn loading the compression driver better than the compromise 8 in. coax solution. In larger speakers, like our McCauley S15, 15 in. coax, I have been pretty happy with the response. In fact there is a quite a bit of improvement due to the horn loading the 15 in. diaphragm. [/QUOTE]

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