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Old 29th July 2013, 10:31 AM   #1
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Default Faital Pro 3FE22 - 4 ohm

Hi, I would like to build a small portable speaker with 2 faital pro 3FE22 / 4 ohm ; the internal volume is 1.8 liters. It will be powered by a 12V battery. So, I would like to make it a bass reflex speaker (the 2 drivers share the same volume).
I wonder how I should tune it : I was thinking about going for 120 Hz, to have the maximum power output without reaching x-max (at the price of not too many lows...).
What do you think ? Should I just make it a closed box or the reflex one is better, even in such a small volume ?

Thank you !
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Old 29th July 2013, 07:50 PM   #2
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What connections are you using series or parallel?
For two drivers (4 ohm) final impedance can be 2 or 8 ohms?!
(or do you mean a 4 ohm each for stereo.)
I would go and use the bass reflex. If a stereo, with separated/independent internal chambers for each driver.
Each driver Faital Pro 3FE22 / 4 ohm, reference here,
http://www.faitalpro.com/products/LF...p?id=401000101
with a (BR) VB = 0.7 L tuned to 98.0 Hz.
F-6 dB 109 Hz, F-3 dB 144 Hz if you need to add a woofer later in time.
Don't worry about about Xmax or (Xmech), you can use it @40/50Hz without reaching it's mechanical threshold of damage that is 7.3 mm ~@20 W/4 Ohms.
An approximate measure for the vent is 2.5 cm (diam) for length 20 cm (x1 driver@0.7 L).

Last edited by Inductor; 29th July 2013 at 08:12 PM.
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Old 29th July 2013, 08:55 PM   #3
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Hi,

thanks for your answer.

You're right, I forgot to mention that it will be a stereo system, so each speaker will be on each channel of the amplifier (probably an amp6), without separation.
So it will be one port for both of them.

Wouldn't that be better to tune it higher ? If I put your recommendation on WinISD, I reach the x-max quickly (not the x-damage). I don't really get the difference between the x-max and the x-damage...

It seems that I can get a better F3 with a higher tuned cabinet ?

Thanks a lot !

p.s : I will probably use Maxxaudio on my music (meaning I will rerecord some music through it, trying to get more low frequencies thanks to it !)
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Old 30th July 2013, 12:56 AM   #4
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No, do a slot vent as many pro applications. Align as I said because there are no problems with max excursion for that (max.) power. Damage is the max excursion applicable at 7.3 mm for the driver. No problem with Xmax. The sealed app with be different in the x or low frequency roll-off (F3=230/250Hz and up).
The enclosure you mention is wrong, separate the enclosure for you don't have interference between channels. One for both drivers is not a good idea.

Last edited by Inductor; 30th July 2013 at 01:06 AM.
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Old 30th July 2013, 04:22 AM   #5
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On my mini Karlsonator thread I built a box meant for two drivers to be driven as parallel load but tried hooking up each driver to separate left and right channels and to my surprise it sounds really good. Bass was there and highs were there and it sounded mono but the best mono I have ever heard. This was with two Vifa TC9FD drivers. You can listen to the pseudo mono sound clips in the first post. Just thought I mention this as one chamber in the case of a ML-TQWT speaker seems to work if cabinet was designed for dual driver. So for a simple bass reflex tune WinISd as if you are using a dual driver BR it may produce a good result.
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Old 30th July 2013, 08:19 AM   #6
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Thanks for your answer !

Inductor, I don't really get why you would tune it so low. In WinISD, if I tune to 120 Hz, the F3 is better, and the response frequency seems to be better. So why tuning it so low ?

Thanks !
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Old 30th July 2013, 04:49 PM   #7
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Quote:
Originally Posted by roubi View Post
Thanks for your answer !

Inductor, I don't really get why you would tune it so low. In WinISD, if I tune to 120 Hz, the F3 is better, and the response frequency seems to be better. So why tuning it so low ?

Thanks !
I can make 2 sims for you if that helps in any way. But make sure you are using the right parameters for the 4 ohm (post #2) FAITAL PRO 3FE22-4 from the website or they can never be compared.
The right alignment is a personal matter. I'm not here to make you change your opinion.

I hope you got my note on the inside of the enclosure, and I'm sure you never wanted to share the space between the 2 stereo drivers, they would interfere with each other. Also make use of some acoustic absorption felt because of the inside reflections.
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Old 31st July 2013, 01:15 PM   #8
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Hi,

Thanks a lot for your answer.
I am surprised about it seems to be important that the left and right speakers do not share the same enclosure as many do, like most of the dock we can fin (Bose soundlink, Jambox...)

Almost all the musics do not have a stereo separation in their lower frequencies ?

I guess, I'll need to make some test for the alignement. The 20cm port is going to be hard to include, maybe in 3D...
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Old 2nd August 2013, 10:04 PM   #9
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Hi Roubi,

As it happens I have two Faital 3FE20, which is the same speaker with a slightly different front plate, on order. My intended use is as a midrange > 250 Hz. I have studied the specs and from what I saw they are likely to disappoint for what you are planning to use it for. The reason is no low end and very limited linear X. Xmax may be reasonable, but it's a 4 mm voice coil in a 3mm gap. That's .5 mm linear Xmax.

Have you considered the Aura NS3, for sale at Madisound. You will be able to get some real bass from a 1.5l enclosure. It is less efficient than the Faital, but I don't trust their specs; I get to a calculated efficiency of only about 83.5 dB/W, which still is decent for a speaker this size. The NS3 is below that, but your Amp6 will be able to drive it to high enough levels.
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Old 4th August 2013, 08:09 AM   #10
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Quote:
Originally Posted by vacuphile View Post
Hi Roubi,

As it happens I have two Faital 3FE20, which is the same speaker with a slightly different front plate, on order. My intended use is as a midrange > 250 Hz. I have studied the specs and from what I saw they are likely to disappoint for what you are planning to use it for. The reason is no low end and very limited linear X. Xmax may be reasonable, but it's a 4 mm voice coil in a 3mm gap. That's .5 mm linear Xmax.

Have you considered the Aura NS3, for sale at Madisound. You will be able to get some real bass from a 1.5l enclosure. It is less efficient than the Faital, but I don't trust their specs; I get to a calculated efficiency of only about 83.5 dB/W, which still is decent for a speaker this size. The NS3 is below that, but your Amp6 will be able to drive it to high enough levels.
I've got a pile of these drivers laying around here; some thoughts on their merits:

1) Faital 3FE20 - looks good on paper, has great specs for horn loading. Has a bit of that paper cone distortion, and the high end is a little iffy. Not much displacement.
2) Fostex FF85WK - basically the same size and price as the Faital, but a ferrite motor instead of neo. Sounds very nice to me, and has very similar specs. I was defending the Faital a couple years back, and another forum member turned me on to the Fostex, and I have to admit it seems to be a better driver.
3) Dayton ND91 - basically a clone of the Aurasound NS3, with some improvements that were requested by Don Keele. Just an amazing driver, and a screaming deal at the price. IMHO the 'cleanest' of all the small drivers, and clearly the displacement winner. My only real grip with the ND91 is that it's not horn-friendly. But that's due to the high moving mass, which is a necessity for the large displacement.
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