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Multi-Way Conventional loudspeakers with crossovers

SB Acoustics Textreme.
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Old 6th January 2021, 03:36 PM   #711
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I am excited because the TexTreme really does seem to avoid a lot of issues most other cone materials have.
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Old 6th January 2021, 03:42 PM   #712
Oneminde is offline Oneminde  Sweden
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Here is what I informed a guy who didn't know about TeXtreme.
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Theoretically, TeXtremeŽ should bridge the gap between paper and aluminium, without losing the musicality of paper nor the elevated details of aluminium, with neithers disadvantages. One of aluminums disadvantages is the cone breakup which is sewer when it happens, aka critical. Almost all aluminium tweeters has a similar cone breakup at roughly 25kHz. This brings us back to Inter Modular Distortion. Because the cone is misbehaving badly between 20-30kHz, this will be noticeable. Al Midrange and woofers will also have these issues, unless treated for. SB Acoustics have their NAC/BNAC and CAC series which uses a set of elongated dimples in the cone and YG Acoustics have ribbons on the backside of their driver. This does aid in that the breakup will happen later or further up on frequency which is an advantage seen from the crossover point, which is then, earlier in relationship to this cone breakup, resulting in cleaner reproduction due to more suppressed IMD and THD within its useful range - another way to express that is: The farther away the cone breakup is from the XO point, the quieter the distortions are at the XO point.
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Old 6th January 2021, 03:45 PM   #713
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... the benefit should be more noticeable on mid- and woofers.
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Old 6th January 2021, 03:48 PM   #714
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light, stiff, strong, self damping...what did I forget??? Getting any break up mode higher up in frequency is always a good thing. Having a very flat and smooth FR is obviously important but I maintain; a quick and precise transient response is just as important. And, for me, any driver that can do ALL of these things AND, can also work with 1st order passive crossovers ticks most of my boxes...
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Old 6th January 2021, 03:55 PM   #715
Oneminde is offline Oneminde  Sweden
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1st order on the MW13TX is maybe hoping too much unless you are doing like Duelund were the center frequency is at 1kHz then yes, but the Duelund is a 4th order filter which has the benefit of all drivers in phase with only one full 360 rotation between 20hz and 20kHz... which is the whole point of that filter.. so yeah ... LOL
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Old 6th January 2021, 03:57 PM   #716
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On another note, my trusted NAD CD player died last week after 10 years of use. I really want a higher end SACD player (I have many classical and jazz hybrid CDs). The Arcam, Technics, etc. are out of the immediate price range for now but I did find a used Denon SACD player for about $100 US and FedEx should be making that delivery within the hour. I have a mini amp and mini speakers in use right now, giving them to my brother so my main system is not connected. If the SACD player is in proper working order (it was tested and has a guarantee); that will give me even more incentive to go for the MW13TX... I have a very decent turntable and cartridge; I also have some high quality FLAC music files so happy listening!
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Old 6th January 2021, 04:01 PM   #717
Oneminde is offline Oneminde  Sweden
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24bit FLAC is all I rock these days One doesn't need an excuse to use the MW13TX besides the MW13TX itself.. or at least, that is how I hope it will be.
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Old 6th January 2021, 05:39 PM   #718
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Quote:
Originally Posted by Oneminde View Post
Here is what I informed a guy who didn't know about TeXtreme.
If the crossover is steep enough to mean a driver is not playing anything at the point of break up, I thought that was job done, and the breakup would have no effect on the driver sound?

Was I wrong?
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Old 6th January 2021, 05:55 PM   #719
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Quote:
Originally Posted by lbstyling View Post
If the crossover is steep enough to mean a driver is not playing anything at the point of break up, I thought that was job done, and the breakup would have no effect on the driver sound?

Was I wrong?
No, you are not wrong. How much or little impact the issue has is ofc dependent upon how quiet it is in relationship to your nominal listening level.

Say that the driver has its cone breakup at 5kHz and your XO point is at 2.5kHz and you are using a LR4 filter with -24dB per octave slope, then ideally that the 5kHz should be down by 24dB at 5kHz. S, what does that mean ? Say you are listening at 80dB as your nominal listening level, then the cone breakup (beginning of it) should be no louder than 56dB. A dB change of 20dB is equal to 4 times less in volume loudness and 10 times less in terms of SPL. So, depending on how sewer the 5kHz cone breakup is will determine how noise (relatively speaking) it is. Going from 5kH to 10kHz, the slope should be -48dB which is more than 8 times lower in loudness.. Ofc, all of this is ideal, theoretical and so forth.

So its not a matter of IF the cone breakup, IMD and THD has an effect, it is by how much it affects the listener. Generally speaking, the lower the better. Another factor is at which frequency's. Say that we are analyzing 250Hz XO for a woofer that has cone breakup at i dunno, say 750Hz .. vs looking at a midrange driver reflected earlier in my reply. If we include the Fletcher-Munson equal loudness contours, we get a much more complex picture... and that is the point.

Audio or sound is complex. Like what if the crossover produce out of phase on all drivers, is that an issue or not ? for some it is for others its not. So while one can answer with a theoretical no to your question, in reality it is a biter more complex than that and as usual, you have to listen and experience what you preach or what you think is right.

Cool huh ..
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Last edited by Oneminde; 6th January 2021 at 06:00 PM.
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Old 6th January 2021, 08:58 PM   #720
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Thanks for the explanation.

I ask as I'm contemplating running a JBL 2242 (18 inch) up to 620 Hz, but it has increasing distortion at 1200hz, and breakup at around the same point.

I have fully digital active crossovers though, so was not sure if it would be a go.
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