Since Bill is spilling about his 'Keeping up with the Jones' build, I thought I would as well...
I looked around for awhile for a coax that I thought would be a great candidate for this, and finally settled on the B&C 5FCX44. I had looked at it about 6 months prior for a compact 3-way, even doing a prelim simulation to test the waters, and it seemed viable for that now defunct idea. Then this theme came up and rejuvenated my interest in it. Then I found a review in Voice Coil November 2012, Volume 27, Issue 1. The linearity of the suspension, the better than spec Bl range allowing an Xmax of 5.0mm, and the high enough sensitivities lend well to smoothing out the not so flat responses. To top it off, Vance measured HD at 125dB. The compression driver is under 2% at that output above 3.5k. The woofer is (I think, it's hard to read in PDF form) 6% at the same output from 400Hz and up, except for a blip just below 1k. Since I'm not going to be using them at those levels, and the xover deals with the issues, HD will be greatly reduced.
The woofers I'm using are a quad of the KB 55-5665 series, running a pair in each cabinet in isobaric mode. Since I got them when they were for sale and not yet on closeout, per the rules, this is okay. I have been told that they may remain on sale from another company for an extended period of time, but I don't know for how long or if they will even renew the stock when depleted.
I'll elaborate more later in detail, but suffice to say that this combo lends itself well to a solid F3 of 28Hz, and the volume does not exceed a cubic foot in total. Volumes are 5 ltrs sealed, and 22 ltrs vented. Preliminary simulations dictate a reference sensitivity of just over 80dB. Unfortunately you can't get very much above that level unless you go with a larger more sensitive woofer in most cases. 88dB - 6dB BSC = 82dB reference and then DCR losses or frequency response manipulation.
So- about the name...
The coax works in tandem.
The woofers work in tandem
...and the masochistic (hint) xover also works in tandem.
This made the name aptly stated, and it stuck!
More later,
Wolf
I looked around for awhile for a coax that I thought would be a great candidate for this, and finally settled on the B&C 5FCX44. I had looked at it about 6 months prior for a compact 3-way, even doing a prelim simulation to test the waters, and it seemed viable for that now defunct idea. Then this theme came up and rejuvenated my interest in it. Then I found a review in Voice Coil November 2012, Volume 27, Issue 1. The linearity of the suspension, the better than spec Bl range allowing an Xmax of 5.0mm, and the high enough sensitivities lend well to smoothing out the not so flat responses. To top it off, Vance measured HD at 125dB. The compression driver is under 2% at that output above 3.5k. The woofer is (I think, it's hard to read in PDF form) 6% at the same output from 400Hz and up, except for a blip just below 1k. Since I'm not going to be using them at those levels, and the xover deals with the issues, HD will be greatly reduced.
The woofers I'm using are a quad of the KB 55-5665 series, running a pair in each cabinet in isobaric mode. Since I got them when they were for sale and not yet on closeout, per the rules, this is okay. I have been told that they may remain on sale from another company for an extended period of time, but I don't know for how long or if they will even renew the stock when depleted.
I'll elaborate more later in detail, but suffice to say that this combo lends itself well to a solid F3 of 28Hz, and the volume does not exceed a cubic foot in total. Volumes are 5 ltrs sealed, and 22 ltrs vented. Preliminary simulations dictate a reference sensitivity of just over 80dB. Unfortunately you can't get very much above that level unless you go with a larger more sensitive woofer in most cases. 88dB - 6dB BSC = 82dB reference and then DCR losses or frequency response manipulation.
So- about the name...
The coax works in tandem.
The woofers work in tandem
...and the masochistic (hint) xover also works in tandem.
This made the name aptly stated, and it stuck!
More later,
Wolf
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