Haven't simulated it in a box yet, but like all FaitalPro mid-woofers, this features really nice high frequency extension.
FaitalPRO | LF Loudspeakers | 6RS140
FaitalPRO | LF Loudspeakers | 6RS140
. After about 10kHz the breakup is done and it rolls off as you would expect.If It's a soft cone then breakup wont sound bad. I can't see any peaks In the response, so assuming Faitals graph Is correct I'd be very surprised If the breakup was hard on the ears.
In contrast, the hard coned SB15NRXC30-8 sounds nasty without the breakup taken care of .
In contrast, the hard coned SB15NRXC30-8 sounds nasty without the breakup taken care of .
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While the cone breakup may shape the response up at the same rate that the voicecoil inductance makes it go down giving a flat response and perhaps not too much ringing, the main problem is that the non-linear distortion components from lower frequencies that land in the breakup region get shaped up too so they are higher compared to a driver which doesn't break up. There's little reason to cross a 6.5" midwoofer above 3kHz so it's preferable if there isn't cone breakup and the response just rolls off smoothly. Less cone breakup equals lower upper-mid/lower-treble distortion.
e.g. This doesn't look too bad except the little blip at 4.7kHz
http://www.zaphaudio.com/6.5test/6MI90-FR.gif
Until you see the steadily rising distortion from 300Hz to 2kHz
http://www.zaphaudio.com/6.5test/6MI90-HD.gif
The exception to this is when the motor is so linear that shaping the distortion up 10dB or so doesn't matter because it's still really low. The SB15NRXC30-8 is a good example of this. It's breakup is harsh but almost absent from it's distortion curves. The breakup is easily dealt with in the crossover though, it just takes a few extra components.
Since manufacturers rarely publish non-linearity data, it's best to avoid drivers which have breakup occurring at a low frequency if you don't need an 'extended' response.
e.g. This doesn't look too bad except the little blip at 4.7kHz
http://www.zaphaudio.com/6.5test/6MI90-FR.gif
Until you see the steadily rising distortion from 300Hz to 2kHz
http://www.zaphaudio.com/6.5test/6MI90-HD.gif
The exception to this is when the motor is so linear that shaping the distortion up 10dB or so doesn't matter because it's still really low. The SB15NRXC30-8 is a good example of this. It's breakup is harsh but almost absent from it's distortion curves. The breakup is easily dealt with in the crossover though, it just takes a few extra components.
Since manufacturers rarely publish non-linearity data, it's best to avoid drivers which have breakup occurring at a low frequency if you don't need an 'extended' response.
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Interestingly the 4Ω version of the SB has that huge break up peak without any appreciable increase in impedance.
5" SB15NRXC30-4 :: SB Acoustics
So the absence of an increase of impedance does not indicate the absence of cone break up.
(For some reason the published curve for the 8Ω stops early)
the "vocals" version looks interesting too
http://www.faitalpro.com/en/products/LF_Loudspeakers/product_details/datasheet.php?id=101020145
http://www.faitalpro.com/en/products/LF_Loudspeakers/product_details/datasheet.php?id=101020145
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