A really nice new 4” Full Range from Faital Pro

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That’s really nice performance at around 15 degrees off axis if you consider the above zero and 45 plots. A parallel pair of the 4” version with one being used with a .5 coil for BSC would be a nice compact speaker
https://faitalpro.com/en/products/LF_Loudspeakers/product_details/index.php?id=401005105
 
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I assume you mean the 4FE42? https://faitalpro.com/en/products/LF_Loudspeakers/product_details/index.php?id=401005105

Yea this driver looks really promising. I have the brother 4FE32 here in a bluetooth speaker, to be used above >300Hz - build is just finished, still have to measure and configure DSP, but just fullrange driven the little Faital 4" play surprisingly well and complete:

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The 4FE42 seems to be designed even more exhausted.

Faital has also two new cheap and Hifi-capable 10" and 12", together with the 4" this may give nice value FAST speakers:
https://faitalpro.com/en/products/LF_Loudspeakers/product_details/index.php?id=401040111
https://faitalpro.com/en/products/LF_Loudspeakers/product_details/index.php?id=401050015

(or a nice value 3-way with additional 0,75" tweeter >3-3.5kHz, but we're in the fullrange subforum, well ;-) )
 
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For the sake of argument to the point, yes……which is to say that a full range driver doesn’t exist as the best way of accomplishing the goal.

But for a 4” cone, clearly the response indicates nearly best possible outcome of relative smooth response out past 15k with not so poor off axis response for a 4” cone.
 
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I would call it more of a midrange, suiting LR4 high pass 300Hz and low pass 3000Hz with a healthy 89dB/2.83V (8 ohm driver) following baffle step losses:

https://www.htguide.com/forum/forum...domes-large-and-small-small-and-large-baffles
I was looking for some more information on this driver, so I bumped into this thread.
The pictures in this link don't work anymore, but this one does;
https://diy.midwestaudio.club/discussion/2513/faital-4fe42-new-4-midrange-with-copper-cap

Hifi-Selbsbau tested its cousin.

I can't say that I fully agree with your statement.
The intended purpose of this driver are generic PA applications.
Although the data shown is very limited, it doesn't look like the resonance around 3kHz is creating a destructive peak of some kind. It only shows in the distortion.

Meaning we can just use a little notch to keep the distortion under control.

In my experience the very fast majority of people won't complain about such small problem in the intended application.
I even doubt most would find it problematic in a hifi environment.

I do agree that it would have been nice if they tackled this issue, but I can totally understand the ratio between effort/costs and performance here.

With a healthy range up to 106dB (according hifi selfbau) is nothing to be ashamed off for such a small driver.