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Considering a compromise
Considering a compromise
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Old 2nd April 2006, 06:03 AM   #1
mashaffer is offline mashaffer  United States
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Join Date: Jun 2004
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Default Considering a compromise

I am considering a compromise. My ideal system would be an architectual project (built in horns or IB or combination of the two) but aside from the cost I am also probably not staying in this house more than a few more years so maybe I ought to just upgrade my existing boxes. I have described them here before (old JBLs with rotted 12" replaced by organ speakers and midranges deteriorating fast).

So my thought is to get a taste of fullrange single driver with a bit of compromise on the ends all using the existing boxes. The current driver compliment is one each of 12", 5" and 3" cones. Though my idea of a perfect fullrange is more along the lines of an 8" (I do like lots of impact) I think that I can get away with using the 5" hole for the fullrange given the smallish room that I listen in.

So the thought is to use a fullrange 5" like the Tang Band W4-656SB or WA-657S along with a nice Dayton 12". These would bolt right in place and I would plan to use the 12" as a sub by crossing over at about 200Hz. I would have liked to keep the entire vocal range on the fullrange driver but I think that running it that low would compromise dynamics.

Since the fullrange is good up to about 15KHz my 45 year old ears probably wouldn't even need a tweeter but I might go ahead and hook one up with a first order high pass at about 10KHz just to help with dispersion and some of the ultra sonic things that some other people can hear. .

Some of the details are sketchy right now but I think the best thing is to use a plate amp to drive the subs and hook the main amp into the fullrange (and optional tweeter) but I could do it in stages. Replace existing MR with the FR and use passive crossover to existing woofs, then add nicer woofs, and then add the plate amp. Or I could spring for the extra cash to get the plate amps right away to simplify mating the two drivers. In either case I plan to seal off a seperate compartment for the woof.

Any thoughts? Also I would rather that the FR driver be a bit more efficient than the TBs (87-90dB/w). Any suggestions for good high efficiency alternatives that are exactly 5" in diameter at the mounting plate (would rather not cut new holes or patch old ones)?

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Old 2nd April 2006, 07:55 AM   #2
westend is offline westend  United States
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The CSS FR125 has an overall flange diameter of 5". I'm not sure of the baffle of the JBL cab so I don't know if that driver meets your size criteria. It seems to fit your use fairly well.
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Old 3rd April 2006, 01:18 PM   #3
lovechild is offline lovechild  Europe
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Default Re: Considering a compromise


for more efficiency you want to consider the Fostex FE127e or better the FE126e. Both should work very well when crossed over at 200 Hz.

I have read several reports from people who had great results with these Fostex' and 10" or 12" high efficiency woofers (i.e. Eminence) coupled with passive xovers, but if you have no experience in xover-design, I think the plate amps with active xo will be the better solution.

best, LC
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Old 3rd April 2006, 04:14 PM   #4
Paul Ebert is offline Paul Ebert  United States
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In what ways (and to what degree) is the 126 better than the 127?


Paul Ebert
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Old 3rd April 2006, 06:31 PM   #5
lovechild is offline lovechild  Europe
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effficiency, 93dB vs. 91dB.
It's also been said that the 126 is better in the midrange, but I haven't had the time to dig deeper in that. There has been a detailed discussion on the issue in the diyAudio Full Range Reference Project .

best, LC
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Old 12th May 2006, 08:12 AM   #6
wolf_teeth is offline wolf_teeth  United States
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Default Where'r you located?

I'm in Indiana(northeast), too, and have a set of FR125's as well. I have plans for them, but will reveal them if they pan out as planned.
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Old 13th May 2006, 07:30 AM   #7
consort_ee_um is offline consort_ee_um  United Kingdom
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I am using the FR125s and getting the trough in the response after 7KHz seen by this chap:
Its significant enough for me to want to use a tweeter.
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Old 14th May 2006, 11:45 PM   #8
Kensai is offline Kensai  United States
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Maybe go with the Tang Band (or at least something that fits with more Xmax than a Fostex), and a 12" Dayton passive radiator. That might get you enough bottom end while keeping the entire vocal range on the fullranger?

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