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Old 5th January 2010, 04:33 AM   #11
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Originally Posted by thadman View Post
Acoustic Elegance produces several drivers which are characterized by a smooth, extended response. The AE TD12M and AE TD15M are prime examples.

If it helps, I believe Augerpro has taken measurements of the TD12M.
Yes that does. Thanks!
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Old 5th January 2010, 03:35 PM   #12
gedlee is offline gedlee  United States
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Originally Posted by dantheman View Post
I'm sort of looking for a flattish cone made our of a soft material in order to have an extended and smooth HF response? I don't want to see those high peaks that metal drivers often have even if their pistonic range is better.

Thanks again,

Dan
A soft material is going to have a much lower pistonic range, although it will break up more gradual and smooth. A rigid material will extend the pistonic range but break-up in basically undamped and unpredictable ways. Its a trade-off. Doped paper has been and IMO remains the best compromise. Done correctly it works well. The surround does tend to be the limiting factor in performance since it is virtually always the first point of non-pistonic motion, making the cone somewhat irrelavent.
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Old 5th January 2010, 05:10 PM   #13
jzagaja is offline jzagaja  Poland
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Cone can be replaced with a disc of several milimeters thickness and balanced with local mass. Nicely damped midrange-bass drivers:

2" coil:
GDN-30-400-8-SE - Sklep internetowy

4" coil:
GDN-38-1000-8-SE - Sklep internetowy
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Old 5th January 2010, 05:15 PM   #14
thadman is offline thadman  United States
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Originally Posted by jzagaja View Post
Cone can be replaced with a disc of several milimeters thickness and balanced with local mass. Nicely damped midrange-bass drivers:

2" coil:
GDN-30-400-8-SE - Sklep internetowy

4" coil:
GDN-38-1000-8-SE - Sklep internetowy
Balanced mode radiators are interesting. However, I believe they may be far from a mature state of development.
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Old 5th January 2010, 05:19 PM   #15
jzagaja is offline jzagaja  Poland
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I've made special horn for 3" BMR. More on later.
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Old 5th January 2010, 06:13 PM   #16
badman is offline badman  United States
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Originally Posted by gedlee View Post
A soft material is going to have a much lower pistonic range, although it will break up more gradual and smooth. A rigid material will extend the pistonic range but break-up in basically undamped and unpredictable ways. Its a trade-off. Doped paper has been and IMO remains the best compromise. Done correctly it works well. The surround does tend to be the limiting factor in performance since it is virtually always the first point of non-pistonic motion, making the cone somewhat irrelavent.
Pretty simple. There are certainly many "paperish" and "dopey" materials, so there's a lot of variation on that theme. Then, of course, there's ribbed, pure straightwall, and curvilinear cones, each with their own issues. Some of the older JBLs were their own profile (123A), with a near-flat section near the surround, and a curve down into the dustcap. These sound superb, but don't meet the sensitivity and output criteria- they're 90dB and 50W.

But they stay very smooth.
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Old 5th January 2010, 06:44 PM   #17
Baldin is offline Baldin  Denmark
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Hi jzagaja

The drivers on that site seems extreemly good value for money
Seems like quite nice drivers as well. What is you impression compared to other brands?
Something like this seems like a nice 6,5" driver for less than 35 Euro!!!!
GDN-18-130-8-AKX - Sklep internetowy

also really cheap speaker components etc.

---- sorry for side stepping a bit -----
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Old 5th January 2010, 07:03 PM   #18
jzagaja is offline jzagaja  Poland
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STX is an interesting company. They take very best components from Asia and assemble in Poland. My friend who is talented speaker builder used their woofer with Seas Prestige tweeter:

GDN-18-140-8-AWX - Sklep internetowy

(enclosed picture, speaker painted with Nextel coating)

I can truly recommend them (look for AWX series). We wait for their new line of ceramic tweeter and carbon fiber drivers (3-way projects).

From my side I'll be testing their PA drivers and plan cooperation with them.
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Old 5th January 2010, 07:12 PM   #19
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So which surround material will assist in creating the smoothest break-up? Again something well damped like santoprene?

Thanks,

Dan
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Old 5th January 2010, 07:16 PM   #20
thadman is offline thadman  United States
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So which surround material will assist in creating the smoothest break-up? Again something well damped like santoprene?

Thanks,

Dan
I would look for a linear material, which inherently possesses significant damping. Also of consideration is the impedance match between the cone and the surround, for this interaction determines how much energy is reflected back into the cone and how much energy is dissipated by the surround.
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