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Multi-Way Conventional loudspeakers with crossovers

SB Acoustics Textreme.
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Old 29th October 2019, 04:16 PM   #141
454Casull is offline 454Casull  Canada
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Quote:
Originally Posted by Oneminde View Post
It should be Al/Al-Mg domes. If we look at SBA's Be domes, they don't show that type of breakup. Irregularities above 20kHz can be from multiple sources, so issues above 20-25kHz can't be exclusively traced to the dome material. Take TW29DN which is a soft dome tweeter, it has som elevated energy above 10kHz and evidence of cone breakup at 15kHz which can be seen off-axis (SBA's own measurement), but its not evident in the harmonic measurements (see link) while SB26STC can't be said to show this. Hificompass measurements show different content off-axis compared to SBA's while on axis is fairly similar.

Satori TW29DN | HiFiCompass
SB Acoustics SB29SDAC-C000-4 | HiFiCompass

The question I have regarding TeXtreme as a tweeter material is: What does it solve or contribute to ? With the existence of already nice tweeters from SBA, right now its difficult to see what this TX tweeter will offer. TeXtreme as midrange and woofer material is much more interesting.
Sorry, you mean to say that they're using different dome materials for the different impedance versions?
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Old 29th October 2019, 04:23 PM   #142
Oneminde is offline Oneminde  Sweden
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Originally Posted by 454Casull View Post
Sorry, you mean to say that they're using different dome materials for the different impedance versions?
That's an odd question.. he he. No and I'm not sure why you are asking. So had to check the Fr response for both. The 8ohm has less cone breakup above 20kHz@60 degree. The only reason this exist - in my mind - is less motor control on the 4ohm. Its not an issue bellow 20kHz, but non the less, interesting to see. Thanks for pointing it out
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Old 31st October 2019, 01:15 AM   #143
Oneminde is offline Oneminde  Sweden
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Default 2x MW16TX-8: Sealed vs Aperiodic vs Ported (Bass reflex) - Simulated

Ql is the Q-value due to unwanted enclosure and woofer leakage losses
Qa is the Q-value due to enclosure damping material (or absorption losses)
Qp is the Q-value due to port losses

In normal cases Ql is in the range 5-20. Ql is 7 in most cases, but 15 to 30 if the enclosure has very little leakage. Ql may be 7 even with an enclosure with no leakage because the driver unit itself may have leakages.

A box with moderate lining has a Qa of about 30. A heavily stuffed box can have a Qa of 3. Qa is 7 for about a half-filled enclosure.

A perfect port will have absolutely no losses in which case Qp is very large. A good port, one which does not significantly restrict air flow, has about 100 of Q-value.

***
For the sealed cab, I used a Ql = 30 to simulate a very tight cab.
For the aperiodic cab, I used a Ql = 1.9 which kept the Group Delay bellow 3ms.
For the ported cab, I used a Ql = 30 just like for the sealed.

Keep an eye on the phase response (gray curve in the impedance column), impedance and group delay (transient response)

***
Which enclosure would you build and why ?

Click the X in the bottom left corner for full size.
Attached Images
File Type: jpg 2 x MW16TX-8 Woofers in parallel.jpg (618.8 KB, 802 views)
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Last edited by Oneminde; 31st October 2019 at 01:18 AM.
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Old 26th November 2019, 09:47 PM   #144
Oneminde is offline Oneminde  Sweden
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Did everyone leave and vent on vacation
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Old 27th November 2019, 08:19 AM   #145
David Morison is offline David Morison  Scotland
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Americans celebrate Thanksgiving at this time of year so that would explain some absences, yes.
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Old 27th November 2019, 10:35 AM   #146
Zvu is offline Zvu  Serbia
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This will be Kiwi/Aussie/EU forum almost exclusively for the next few days
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Old 27th November 2019, 03:44 PM   #147
Oneminde is offline Oneminde  Sweden
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I know there isn't much information currently to be handed out, but that does not mean I don't want it... LOL.
And I'm spoiled with frequent updates
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Old 2nd December 2019, 10:05 PM   #148
Ugg10 is offline Ugg10  United Kingdom
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Just noticed on the SB Acoustics site all the “coming” models including the textrene woofers and tweeters are marked as “pre-order”, only one that is not is the dome mid for some reason.
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Old 3rd December 2019, 12:42 PM   #149
rhale64 is offline rhale64  United States
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Where would we be able to preorder these in the U.S.? Madisound?
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Old 3rd December 2019, 03:36 PM   #150
rhale64 is offline rhale64  United States
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Also and diy kits in the works? I am very interested in these drivers.
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