twin drivers cabinet Fostex FE126E

[lejaybo]

Hello peoples

has anyone made a simple cabinet using 2 x Fostex FE126E per cabinet?

or is there a better way of improving low end bass?

cheers

lejaybo

[rjbond3rd]

Hi lejaybo, I have fiddled with using 2 FE126E's per cab and the advantage I found is that you can re-inforce the bass at the point where it dips due to baffle step. But this isn't deep bass -- it's more like upper bass / lower midrange. Also, using the second driver in this fashion requires an inductor of a specific value on the second driver (a BSC calculator comes in handy). Alternatively, you can just let the second driver run full range but it splashes a lot of HF around the room -- some people like it.

So far, I've tried sealed, aperiodic, BR and horn, all with and without subs. I just bought a cheapo $11 woofer with (supposed) Fs of 28Hz to try next. If you haven't bought your drivers yet, the FE127E is easier to work with (easier to tame). A BiB is a logical choice when bass is mentioned, though I haven't yet built the BiB for this driver.

Have you checked out the bipole cabs for the "diyAudio reference" project? It's a range of FE127E/FE126E cabs: http://www.planet10-hifi.com/boxes-fostex.html#diyRef

Also, while this is not quite what you're looking for, check out this bipole design for the FE127E for some theory on bipole: http://diyaudioprojects.com/Speakers.../FE127E_SB.htm

[lejaybo]

cheers fella

how about using a fullrange driver with a mid bass driver ?

[planet10]

Originally posted by lejaybo
how about using a fullrange driver with a mid bass driver ?

That is called a FAST system. They are becoming more popular. You'll need to bi-amp or have very efficient woofer(s) to do a passive design without padding down the FE126 (and if you are doing tat you might as wll use FE127/103/83/FF85

For the FE126e the simpliest cabs that will get you decent bass are a metronome or a BIB... otherwise you should be looking at a horn

For 2 FE126 you best bet is likely a bi-polar Metronome.

dave

[lejaybo]

FAST system sounds interesting

i've got a quad channel gain clone i'm currently building so i've got enough power,

is there any specific examples of fast systems?

is there much difference between the FE126E and the FE127E?

has anyone used monacor drivers with suscess?

[valleyman]

There is a huge difference between fe126e and fe127e.
The former has a lower q and is designed for use mainly in horns. The latter has a higher q which is going to work better in sealed or ported enclosures etc

[planet10]

Originally posted by lejaybo
FAST system sounds interesting

i've got a quad channel gain clone i'm currently building so i've got enough power,

is there any specific examples of fast systems?

is there much difference between the FE126E and the FE127E?

From the front the FE126 & FE127 are the same... as Vallyman says there is a large difference when it comes to boxes. The FE127 is also a bit smoother, but perhaps with a bit less jump. The FE126 benefits even more from a higher output impedance amp than the FE127, so in that respect would be more suited to your amps (that last bit is mostly about bass -- not a consideration with a FAST.

The most prominent FAST system lately have been variation son the MJK open baffle, We have recently completed Tysen (bit not had an opportunity to talk about it much). Any system that uses a full range as a mid tweeter with a helper woofer(s) is a FAST. XO is typically in the 100-400 Hz range,

dave

[lejaybo]

cheers people

very usefull info

i think i'm gonna keep it simple for my first proper system
with 127's in ported box with some dedicaded 6-8 inch sub's

which leads to my next dilemma

which driver and which box lol

lejay

[norman bates]

I now run a dual 4" bamboo in a single box that naturally rolls at 200hz (way higher due to baffle step).
I also use a 12" with an 80hz fmod for bass.

A higher freq f-mod would help bass more.

http://viewmorepics.myspace.com/inde...ageID=24436495

This works well at 1 listening spot.
You have to be exactly the same distance to both drivers.
When my wife sprawls on the other couch, she is lower and closer to the speaker. I have highs where I am, she does not.
I noticed the sound was good at 1 end of my couch but worse at the other end.

Last week, I places a cd under the middle of the bottom of the cabinet and my highs greatly improved. And it sounds better at the bad end of the couch.
I sit about 12' away from the speaker.

Soon I'll be using 1 driver in open baffle.
I abandoned the 4 driver focused array project.

2 drivers = less excursion = cleaner sound.

but crossing to a woofer near 200hz kills 3 birds with 1 stone.
less excursion.
cleaner voice.
and larger listening spot (vertically).

Crossing at 200hz works better than running 2 4" drivers.
I see why baffle step works well given the drivers arn't too expensive. I didn't see that as an option for the $50 tang band bamboo drivers.

But if you are a transparancy guy (like me), you will not find an active crossover that is as clean as hooking to the speakers without it. You lose detail big time through active crossover, especially at my low listening levels.

Norman

[rjbond3rd]

Hi Norman, how about rolling off the bottom driver with an inductor?