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Open Source "Tower XL"
Open Source "Tower XL"
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Old 4th October 2018, 06:36 AM   #131
mordikai is offline mordikai  United States
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Quote:
Originally Posted by Wayne1 View Post
There are some new drivers being released this weekend from nouaudio.

Dan Wiggins and Dusty from Channel Islands Audio are behind this effort.

The W130 looks like a good candidate for mid-woofer.

I will take a good look at it this weekend at RMAF
Low sensitivity and xbl and high xmax not really needed for a mid.
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Old 4th October 2018, 06:39 AM   #132
mordikai is offline mordikai  United States
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Originally Posted by Aatto View Post
yeah Faital too, also heard good about 18 Sound 6ND430. any specific suggestions ?
hopefully the TD6M issue is taken care of, even with the dip issue it got all good reviews.
I've not heard the 6nd430, but people seem to really like them. The B&C 6ndl38 looks interesting.
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Old 4th October 2018, 07:00 AM   #133
mbrennwa is offline mbrennwa  Switzerland
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Quote:
Originally Posted by Aatto View Post
Hopefully they did fix it by now, Cousin Billy showed how he did get rid off that dip (both here and on AE forum) apparently reflections from the magnet causes the dip and he explained how he got rid of that with a piece of Sorbothane, but the pic he shared does not help much, this goes back to 2015 tho and I could not find any newer info if they fixed the issue or not, they probably did otherwise people would still talk about it. but Cousin Billy mentioned that he liked it better than Accuton C158.
at the end of mentioned AE forum John from AE posted:
"There are clearly some changes as seen in the measured frequency response seen. I still have not been able to recreate this on a test baffle here. It is seen only in cabinets with approximately the same depth. The position of the dip does move with respect to depth of the cabinet though. Most all of these absorption techniques will help lessen any reflection off the inside of the cabinet. There could be a reflection from the lip around the spider, however adding a small amount of foam should not have that significant of an effect then with a resonance at that frequency.

At this point though, we have a new frame we are going to be using as the old one is no longer available. I will get some good measurements of the new driver on a test baffle soon."


Unfortunately this is the last post and no updates since hopefully the posted FR plot in TD6M is the updated measurement, the DIP is there but not significant.
If the magnet/spider/basket system creates any significant acoustic reflections, they would show up at higher frequencies. 900 Hz wavelength is 0.38m, and that's too much to fit into the driver, even when you just take half the wavelength. Also, if the dip changes with different enclosures dimensions, it's not reflections happening in the driver.

If the datasheet does not show the dip, I'd trust that and get one of those drivers. If you find the dip is there on an open test baffle (or whatever they used to get the curves in the datasheet) you simply return the thing saying that it does not match the datasheet specs.
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Old 4th October 2018, 10:57 AM   #134
Paul Vancluysen is offline Paul Vancluysen  Belgium
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Quote:
Originally Posted by Aatto View Post
AE TD6M reportedly has some unusual dip around 900-1K Hz range, AE stock FR pic shows some dip in that area but apparently people are experiencing even deeper dip, looks like there are some fixes around this but not sure if this changes things or not.
4-Way Series Crossover. Accuton and Acoustic Elegance Drivers
Lambda TD6 tests on the way
Only on a large IEC baffle this dip can be observed in a correct way.
All measurements in a cabinet have an extra baffle step boost in the SPL, which depends on the cabinet size and shape.
So at this moment I only take the SPL curve published on the AE website as a reference, because I suppose it has been measured on a large IEC baffle.

Last edited by Paul Vancluysen; 4th October 2018 at 10:59 AM.
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Old 4th October 2018, 03:03 PM   #135
Aatto is offline Aatto  United States
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I did some research on the TD6M, if the dip is caused by basket (or frame) as AE and some other users claimed (pic 1), all the measurements including the one I posted in #125 and Juhazi in #129 is from the old basket, the old basket had 6 pols (or legs or posts...) connecting the magnet to front part and the new one has 4 with slightly different shape (pic 2). so hoping that was it, but weirdly there are no reports or feedback for newer basket since. if we don't hear back from AE, we may have to look for another mid. what is the minimum sensitivity required for the mid to go with TD15X (if) ?
Attached Images
File Type: jpeg 0b59c54b_td6driver.jpeg (143.3 KB, 214 views)
File Type: png TD6M-back.png (243.5 KB, 199 views)
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Old 4th October 2018, 03:39 PM   #136
Aatto is offline Aatto  United States
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just out of curiosity, if the cabinet reflection causes the dip, how would a cylinder or cone shape enclosure for mid section help ?
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Old 4th October 2018, 04:18 PM   #137
Aatto is offline Aatto  United States
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Quote:
Originally Posted by Wayne1 View Post
There are some new drivers being released this weekend from nouaudio.

Dan Wiggins and Dusty from Channel Islands Audio are behind this effort.

The W130 looks like a good candidate for mid-woofer.

I will take a good look at it this weekend at RMAF
interesting looking driver, any price tags ? and let us know your impression.
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Old 4th October 2018, 04:19 PM   #138
Paul Vancluysen is offline Paul Vancluysen  Belgium
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Quote:
Originally Posted by Aatto View Post
I did some research on the TD6M, if the dip is caused by basket (or frame) as AE and some other users claimed (pic 1), all the measurements including the one I posted in #125 and Juhazi in #129 is from the old basket, the old basket had 6 pols (or legs or posts...) connecting the magnet to front part and the new one has 4 with slightly different shape (pic 2). so hoping that was it, but weirdly there are no reports or feedback for newer basket since. if we don't hear back from AE, we may have to look for another mid. what is the minimum sensitivity required for the mid to go with TD15X (if) ?
Conform the TSP of the AE TD15X, it will have a sensitivity of 90.1 dB in full space.

For the speaker we have in mind it will radiate in full space up to about 100 Hz and in half space above 400 - 500 Hz.
So if midrange and woofer are crossed low, suppose 200 Hz, the midrange also has to operate a part in the transition zone from full to half space.

A rough estimation is a sensitivity of 93 - 94 dB in half space for the midrange, to cover some tolerances on woofer and midrange and to choose a low crossover frequency.

Before ordering drivers, we can do a study to check this all w.r.t. sensitivity and excursion...
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Old 4th October 2018, 06:30 PM   #139
Aatto is offline Aatto  United States
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thanks Paul, yes I like lower crossed mids better too,
In different posts and forums AE claims that the dip issue was from the cab and not the driver same as mbrennwa suggested, and they said that they couldn't measure the dip in their test baffle.
TD8M also looks like a good candidate as well, no reported issues and curve looks better too, also only 20$ difference, but looks like it needs to be crossed lower than 2k.
but if we didn't hear back from AE we have two options:
1-finding alternative drivers, finding a good 6-8" midwoofer should not be a problem (maybe the woofers too ?).
2-get the AE drivers and measure it and hope they work well.
I have no problem w either of the options and as much as I want to go with AE but I just do not like the fact that AE does not answer back before ordering the drivers and makes me think that we may have harder time returning the drivers if it didn't work out. just thinking out loud looking for feedback.
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Last edited by Aatto; 4th October 2018 at 06:46 PM.
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Old 4th October 2018, 07:25 PM   #140
mbrennwa is offline mbrennwa  Switzerland
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Originally Posted by Aatto View Post
I want to go with AE but I just do not like the fact that AE does not answer back before ordering the drivers and makes me think that we may have harder time returning the drivers if it didn't work out. just thinking out loud looking for feedback.
If something does not conform to the specs given in the datasheet, any reputable seller should take it back and give you a refund or provide a replacement that works as described in the datasheet. No need to be worried as long you get your stuff from a reliable source.
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