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In the Forum: Audio Discussions
In the Thread: Constructing LF modules to the limits
Post Subject: I truly hate Accutons.Posted by Romy the Cat on: 9/26/2011
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 el`Ol wrote:
A $$$ solution for a bass array that comes into my mind are the sandwich cone drivers from Accuton.
Monstrous neodymium magnet, underhung voice coil (for low flux modulation).
Very low Fs.
Relatively low QMS for use in sealed enclosure with transconductance amps (zero thermal compression).
http://www.accuton.de/drivers/list.php?&m1=2&m2=2&m3=0&matID=2&appID=4
The Accuton drivers are subject of my hate for many years. They what I call “soft” bass drivers, it means the suspension is very soft with huge exertions. When I see the Accuton drivers working it is scare as they move back and forth like crazy, I truly do not like it and I always like the “hard” suspended drivers. This classification on soft and hard suspended drivers does not have any sense and I perfectly see people replay that I am an idiot. I am not. There are some drivers with identical Fs that while produce the same bass notes some of them move more and some other move less. I know that bass peruse is diameter by excursion  and I have no explanation why some excurt more and some do less. What I know that those that excurt less do sound better to me. BTW, my 25W drivers are something the I consider “excurt less”, I did run one single driver and look how it move back and forth – it was not a lot, at list much much lover then some other drivers I have see and MUCH lover then what Accutons do.

Also, Accutons, in my experience are dangers drivers as they behave very badly as they reach Xmax. When I overdrive any other driver with amp then, along with huge distortion you might hear some VC rubbing. The 25W drivers do it in very soft way and they do not get damages. The reportedly “underhung” Accutons when they move all the way out produce absolutely horrible very unpleasant sound. Furthermore the drivers like 25W have sort of similar structure of cone, location when the cone is glued to suspension and suspension. You can touch and knock any of the driver location and it will response virtually identical. This is what I like. The Accutons are very different animal. The stiff cone responds with very good LF response but when you knock or rub the ultra soft suspension then you have nothing in response. The suspension is in my estimate is too soft for the cone and the cone and suspension act like very different vibrating entities. This is very bad. In my past I had one even when I was experimenting with a speaker that had Accuton bass driver and the driver VC jumped out of the gap (talking about the underhunging!) but did not jumped back into the gap straight. So, as the result the cone shucked at ~20 degree, fully exerted. The driver was goner. I had another story when I was playing with another Accuton-arm speaker and the cone was also jumping out of the gap and in it’s way back it rubbed the edge, coursed the cone fracture up on 10000 small pieces. It was very expensive speaker and I was forced to pay the speaker owner to replace the driver.

So, Accutons in my view are drivers the must not be touched. Saying all of it, I might presume that if to have very many of Accutons, let say 10 in the array, where they will not move back and forth too much and will have large power handling, then it might be the only way to use them. Still, the fact the in Accutons cone and sustention live with their own lives make to me Accuton is absolutely ridicules driver.

I know there is company put there, I do not remember the name, that do a very expensive speaker with dedicated LF module that has 4 Accuton woofers. I heard it a few year back in Vegas and it was very wrong bass. Sure there are zillion other reasons why bass was bad in the show but it was very much the same bass that I would expect from Accutons.

The Cat

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