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Open Source "Tower XL"
Open Source "Tower XL"
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Old 3rd October 2018, 10:09 PM   #121
Brett is offline Brett
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Quote:
Originally Posted by Aatto View Post
yes technically we can go active and achieve 100db from a 90db driver
I read this comment as you talking about efficiency / sensitivity, and if correct, no you can't.
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Old 3rd October 2018, 10:24 PM   #122
Aatto is offline Aatto  United States
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no not the efficiency/sensitivity of driver or a passive system, overall SPL in active system ( should have added that to avoid misunderstanding ). I might be wrong but back in my studio monitor days I read that they simply feed more power to drivers (in active systems) to have more max SPL, so you have a very high 110db SPL in a very small package that still goes down to 35-40Hz, I know this ahs nothing to do with this thread but so was my point.
one question tho, I did ask this before and it is off topic but how did Zaph got 92db sensitivity from a 90db woofer in SB12.3 ?
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Last edited by Aatto; 3rd October 2018 at 10:40 PM.
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Old 3rd October 2018, 10:51 PM   #123
montana1 is offline montana1  United States
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Hi Aatto,
If you scroll down to the the very bottom of the SB 12.3 page you will find that Zaph gives the answer to your question. It is the first question addressed under the FAQ heading.

Best,
Rich
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Old 3rd October 2018, 11:30 PM   #124
Aatto is offline Aatto  United States
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Originally Posted by montana1 View Post
Hi Aatto,
If you scroll down to the the very bottom of the SB 12.3 page you will find that Zaph gives the answer to your question. It is the first question addressed under the FAQ heading.

Best,
Rich
interesting read, and I totally missed that thank you.
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Old 4th October 2018, 12:30 AM   #125
Aatto is offline Aatto  United States
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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
Attached Images
File Type: jpg td6sweeps.jpg (98.4 KB, 195 views)
File Type: png TD6M-0-15-30-45.png (29.9 KB, 198 views)
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Last edited by Aatto; 4th October 2018 at 12:33 AM.
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Old 4th October 2018, 12:47 AM   #126
mordikai is offline mordikai  United States
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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
I believe they have changed the design some what since then, but I would not trust that mid without some current measurements and user feedback.
Their woofers I trust because there is lots of user feed back, but the mids too much of a mystery for me at this point.
Why not one of the pro sound 6" mids? Looks like B&C have several interesting ones.

Last edited by mordikai; 4th October 2018 at 12:54 AM.
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Old 4th October 2018, 04:28 AM   #127
Aatto is offline Aatto  United States
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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.
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Last edited by Aatto; 4th October 2018 at 04:31 AM.
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Old 4th October 2018, 04:39 AM   #128
Aatto is offline Aatto  United States
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Originally Posted by mordikai View Post
Why not one of the pro sound 6" mids? Looks like B&C have several interesting ones.
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.
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Old 4th October 2018, 05:22 AM   #129
Juhazi is offline Juhazi  Finland
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About that dip around 700Hz, spider/frame reflections was suspected. I wouldn't trust Cousin Billy's sorbothane result too much though...

Most likely measuring a 6" driver with large plug at 3" distance is the main reason for the bad dip in first link. Even plug shape makes differences! Still, there is dip even in AE's owm data. This is partly compensated with typical baffle step hump.

Notice the difference in response nearfield (yellow)/1m (red)! TD6M - the Lambda Series Little Brother - AE Speakers
Click the image to open in full size.

Wolfgang Klippel tells something here ... https://www.klippel.de/fileadmin/_mi..._Poster_01.pdf
Check this too, by Peter Larsen ! YouTube
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Last edited by Juhazi; 4th October 2018 at 05:46 AM.
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Old 4th October 2018, 05:26 AM   #130
Wayne1 is offline Wayne1  United States
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Open Source "Tower XL"
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
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