Power handling concers for the FE127E - diyAudio
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Old 9th January 2008, 06:45 AM   #1
JJ77 is offline JJ77  United States
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Talking Power handling concers for the FE127E

I am looking into building a speaker set using the fe127e, but I am concerned about overdriving them. The xmax is pretty low, and I am worried that they will bottom out easily in an enclosure like the BIB (no back pressure right?). They will be my mains in a home theater/ music system. They won't see anything below 100hz, and will be paired with an MK sub that my dad gave me

Any thing will be better than the plastic cubes I have now. Thanks to this wonderful forum I can't make up my mind on an enclosure. After reading forever I decided on the BIB, although the Harvey looks like a lot of fun to build. How do they sound?

thanks in advance. I've done some searching but haven't found specific answers.
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Old 9th January 2008, 07:21 AM   #2
chrisb is offline chrisb  Canada
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Used within it's limits, this is a wonderful driver. If the HT receiver has full bass management EQ, and the signal to mains is set to "small", you shouldn't run into problems at "moderate" listening levels (i.e. below 96dB) . For that matter, it makes for a marvelous center channel as well, if you're so inclined.

I'd suggest a small aperiodically damped enclosure such as one of the Planet10 Fonken designs. They are intentionally tuned for higher roll off, and offer tighter control over bass excursion (i.e. less ripple) than the BIB, or conventional bass reflex designs. The GR "classic" rectangular box or milliFonken slot loaded are much easier builds than the large bevel sided Fonken - bear in mind that any of these designs need stands.

http://homepage.mac.com/tlinespeaker...nkenGR-map.pdf


If you'd rather avoid the cost of stands (good ones can easily cost more than the drivers) - the Brynn(Chang) is a relatively compact footprint and fairly easy to build BVR design which sounds excellent as well. The lower void chamber behind the slanted baffle needs additional triangular bracing to the back panel that is not shown on drawing.

I don't have experience with the super-sized Gabriel Chang , but as you've already indicated sub(s) will be used, the extra bass impact from double mouth format would probably be redundant.

http://homepage.mac.com/tlinespeaker...map-021107.pdf
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Old 9th January 2008, 07:31 AM   #3
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Let me chime in here... if you only need bass down to ~100 Hz, the BIB is not the best choice...

The whole reason for the BIB is to get as much bass as possible out of a driver. The compromise for its excellent bass extension is ripple, size, and the requirement for corner loading. i'd expect sub 40 Hz out of an FE127 BIB. to cross it over at 100 Hz you would still be paying for the compromises while throwing out its advantages. Same applies to Harvey (althou it likes to be out fom the walls).

With a 100 Hz requirement you would likely find something that goes to 100 Hz or so a better choice -- this will give you more midrange finesse. If the box doesn't go much below 100 Hz, a simple 1st order PLLXO can be used for the roll-off on the bottom so that you insert no extra active circuitry.

Rolled off at 100 Hz thou you are not likely to have excursion issues with a BIB. Something like the mFonken which is very specifically tarageted at this kind of application would hasve fewer compromises for this ap (and use less resources). Now if visual SLAM is important the mFonken won't cut it, but on the other hand WAF is HUGE

What is your amp?

dave
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Old 9th January 2008, 09:31 AM   #4
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The doubled designs do indeed tend to give more subjective puch to the sound, but more significant IMO is the superior front-back imaging & scale over single-mouth types. Great for piano. More complicated & larger of course.

The problem with the smaller BIB cabinets is loading them right. The large ones (~70in tall) genuinely don't suffer from much response ripple at all once correctly located in corners, because they're properly coupled to the room & the horn flare is completed. The smaller ones (any driver with an Fs over ~60Hz) have a much harder time of it. Upward venting is pretty much a waste of time with them -they're far too far from the ceiling for the expansion to be continued properly by the room, even in corners. Inverted is better, but they do need to be right down on the floor in ther corners to get the coupling they need.

Given that nothing under 100Hz is wanted, then overall, I'd be inclined toward mFonken.
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Old 9th January 2008, 02:10 PM   #5
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If you don't need anything below 100Hz, a simple sealed enclosure should suffice.
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Old 9th January 2008, 02:46 PM   #6
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True. I prefer aperiodic / resistive vents though -easier & less reactive load for the amp.
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Old 10th January 2008, 01:43 AM   #7
JJ77 is offline JJ77  United States
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Thanks for the responses. Good to know that I don't necessarily need a BIB for what I would be using it for. The thing is I may use it full range someday. The other thing is that BR and sealed enclosures are no fun to build I'm kind of a tinkerer, so building a crazy enclosure is a lot of fun for me.

My amp is a middle of the road Sony HT amp. It does have the "small" speaker setting which as far as I know is set at 100hz. Thanks for the advice about the Fonkens. I may go with them if I can get two out of one sheet. For the center I was going to use the same driver in the recommended BR enclosure, but with the port in the back so that the driver can be in the center.

BTW, I stumbled on this DIY speaker stuff completely on accident, and it seems to want to pull me in!
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Old 10th January 2008, 01:44 AM   #8
JJ77 is offline JJ77  United States
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Well I've looked around again. Would there be any compromises to using the floorstander MkII? Tall enough to not need stands, and less wood.
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Old 10th January 2008, 02:01 AM   #9
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Quote:
Originally posted by JJ77
Well I've looked around again. Would there be any compromises to using the floorstander MkII? Tall enough to not need stands, and less wood.
No real compromises compared to the mFonken (but better bass), not quite as much finesse as the full-fledged fonken (i expect mostly due to those big champhers on the front). The whole point of the Floorstander was to create a speaker with a VERY small footprint that reached the floor on its own. The Mk II was done to counter the somewhat tippy nature of the MK 1 (do fill the bottom with sand/lead shot/kitty litter.

dave
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Old 10th January 2008, 02:25 AM   #10
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Default Floor Standing Fonken

You could try these: http://fullrangedriver.com/forum/viewtopic.php?id=533 post #20.

A little more wood but really good looking(I think).

Thanks to P10 for giving us (almost) too many to choose from.

OTOH The MKII looks like an easier build.
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