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Old 15th September 2015, 07:31 PM   #1
pbkrag is offline pbkrag  United States
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Default mFonken?

I was looking at trying my hand at building a pair of speakers. The mFonken looks like something within my ability, and the physical size seems about right. But I'm not sure what driver to use. I have a pair of BK12m from madisound with the FE126en drivers and I like those, for both the sound and the drivers are in the price range I'm looking for. But as I understand it that driver won't work for the mFonken. I mostly listen to jazz and my amps are mostly SE tube amps. So I was hoping for a somewhat efficient driver too. What can be substituted in this design? should I looking at a different design?
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Old 15th September 2015, 09:01 PM   #2
chrisb is offline chrisb
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That little mF (sorry, couldn't resist ), was originally designed for Fostex models such as now discontinued FE127E, and FE103E. With appropriate adjustment to vent tuning, should work well with FF105 & 125WK.

The 126 would "work" in the strictest sense of making sound, but would be severely limited as to LF extension and SPL in an enclosure this size - I'd expect either of the FFs, or even the newest SOL version of FE103 to surpass it overall in this design.

You've answered a couple of the standard questions, but it's also probably worth asking about the size of room and average listening levels.
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Old 15th September 2015, 10:15 PM   #3
pbkrag is offline pbkrag  United States
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I would not expect high listening levels, and there's a few different rooms it could end up in the largest might be 13x12 ish.

I think the main goal for me here is just to gain a little experience in the construction, then end up with a pair of speakers to use in a secondary or Tertiary system, but still sounds good.
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Old 15th September 2015, 10:28 PM   #4
planet10 is offline planet10  Canada
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mFonken?
The same millSize format works for a large number of drivers. FE126En is not one of them, but i have done a slighly smaller box for people who need a centre channel. It is a miniOnken, but it doesn't go low (maybe 100 Hz with a back wind). The lack of bass is because the FE126 really wants to be in a horn.

There are milliSize boxes for both FF105wk and FF125wk, as well as FE108eS, A6.2p, A7.3, CHR/CHP/CHN70, at least one Tangband and more.

FF125wk is probably closest to the FE127, but, at least stock, the FF105wk is a bit smoother at the price of bass & efficiency.

dave
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Old 15th September 2015, 11:13 PM   #5
pbkrag is offline pbkrag  United States
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Thanks,

It looks like the FF125wk fits the bill for me. Do they work with the plans as drawn for the FE127? Or do I need another plan set? if so how do I get them?
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Old 15th September 2015, 11:19 PM   #6
chrisb is offline chrisb
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port tuning would likely need to change slightly - we may even have built a set - it's hard to remember after a while

edit: I'd be inclined to agree with Dave on the 105 actually
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Old 16th September 2015, 12:00 AM   #7
planet10 is offline planet10  Canada
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mFonken?
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Originally Posted by chrisb View Post
port tuning would likely need to change slightly - we may even have built a set - it's hard to remember after a while
Yes, we have a set. Officially part of the FF125wk planset, but if you build the one for the FE127e, just leave out the vent spacer and you'll be good.

dave
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Old 5th November 2015, 01:04 AM   #8
pbkrag is offline pbkrag  United States
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Default Thanks

Here's the finished product. They sound great. Just got the plans for the Frugel-horn XLs. Looking forward to the next project. Thanks Dave.

Pete
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Old 6th November 2015, 11:26 PM   #9
patonga is offline patonga  Australia
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Nice!
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Old 8th November 2015, 05:58 PM   #10
chrisb is offline chrisb
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Indeed - nice work Pete
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